A compound was determined to have the simplest formula CH2. If the molecular weight of the compound is 70 u, what is the molecular formula of the compound? 1. C5H10 2. C10H5 3. C4H22 4. C4H8

Answer:

the inverter has failed

Explanation:

Based on the information provided within the question it can be said that the most likely problem with the LCD screen in this scenario is that the inverter has failed. The inverter is a component used in LCD displays which prepares the power connection so that is provides the correct power to the screens back-light lamp. If there is a problem with the inverter then it would fail to provide enough power which will cause the light and screen to flicker. Such as in this scenario.

Answer:

lattice parameter = 5.3355x10^-8 cm

atomic radius = 2.3103x10^-8 cm

Explanation:

known data:

p=0.855 g/cm^3

atomic mass = 39.09 g/mol

atoms/cell = 2 atoms

Avogadro number = 6.02x10^23 atom/mol

a) the lattice parameter:

Since potassium has a cubic structure, its volume is equal to:

v = [(atoms/cell)x(atomic mass)/(p)x(Avogadro number)]

substituting values:

v =[(2)x(39.09)/(0.855x6.02x10^23)]=1.5189x10^-22 cm^3

but as the cell volume is

a^3 =v

[tex]a=\sqrt[3]{v}=\sqrt[3]{1.5189x10^{-22} } = 5.3355x10^-8[/tex] cm

for a BCC structure, the atomic radius is equal to

[tex]r=\frac{ax\sqrt{3} }{4}=\frac{5.3355x10^{-8}x\sqrt{3} }{4}=2.3103x10^{-8}cm[/tex]

As there was no electric charge on neutrons, and they did not get affected by electromagnetic fields.

Explanation:

The functions of the neutron in atoms is:

To hold the nuclei with coulombic repulsion between the protons.

The neutron has no charge on it and hence were not discovered.

Its mass is slightly less than the proton.

It provides stability to the atom.

Lord Chadwick is credited to prove the existence and discovery of neutron.

He proved that the nucleus of the atom has its mass in the centre as neutron+ proton.

He bombarded beryllium with alpha particles, and found high energy radiation.

The neutron was discovered later than the electron and proton due to the difficulty in detecting uncharged particles. It filled a crucial gap in explaining the atomic nucleus's mass and the existence of isotopes, which differ in neutron count but are chemically identical.

The discovery of the neutron was a pivotal moment in the history of subatomic physics. Before the neutron's existence was proven, it was known that the nucleus contained most of an atom's mass, but the mass from protons alone was insufficient to account for it entirely. The detection of neutrons, which are uncharged particles, proved to be much more difficult than that of charged particles like electrons and protons. It was only in 1932 that James Chadwick provided evidence of the neutron, which not only filled the mass discrepancy in the atomic nucleus but also explained the existence of isotopes, which are chemically identical but differ in their number of neutrons.

Proposals to explain this discrepancy included particles hidden within the nucleus. An early hypothesis suggested that neutrons might be a composite of a proton and an electron, which would explain its neutral charge. However, deeper investigation into properties such as the neutron's magnetic moment and mass raised questions that ultimately required a new fundamental particle's acknowledgment.

Answer: [tex]2 \cdot CH_{4} O (l)+3 \cdot O_{2}(g) \rightharpoonup 2 \cdot CO_{2}(g) + 4 \cdot H_{2}O(l)[/tex]

Explanation:

Let consider that one mole of diatomic oxygen is used. So, the stoichometric can be modelled by using three variables:

[tex]x \cdot CH_{4} O (l)+O_{2}(g) \rightharpoonup y \cdot CO_{2}(g) + z \cdot H_{2}O(l)[/tex]

Where [tex]x,y,z[/tex] are the required variables.

Now, three equations are constructed from the number of elements involved (Carbon, Hydrogen and Oxygen):

Carbon

[tex]x=y[/tex]

Oxygen

[tex]x+2=2\cdot y + z[/tex]

Hydrogen

[tex]4\cdot x = 2 \cdot z[/tex]

The coefficients can be found by solving the abovementioned 3 x 3 Linear System:

[tex]x = \frac{2}{3}, y = \frac{2}{3}, z = \frac{4}{3}[/tex]

The whole-number coefficients are determined by multiplying every coefficient by 3, then:

[tex]2 \cdot CH_{4} O (l)+3 \cdot O_{2}(g) \rightharpoonup 2 \cdot CO_{2}(g) + 4 \cdot H_{2}O(l)[/tex]

The stoichiometric coefficient for oxygen in the balanced chemical equation for the combustion of methanol (CH4O) is 2, as it takes two molecules of O2 to provide enough oxygen atoms to form one molecule of CO2 and two molecules of H2O.

The stoichiometric coefficient of oxygen (O2) when the equation involving CH4O (methanol) combusting to form CO2 (carbon dioxide) and H2O (water) is balanced, can be determined through following a step-by-step approach:

The balanced equation is therefore CH4O(l) + 2 O2(g) -> CO2(g) + 2 H2O(l). The stoichiometric coefficient for oxygen is 2.

Answer: 60 ml of the 65% mixture will you need to add to obtain the desired solution.

Explanation:

According to the dilution law,

[tex]C_1V_1+C_2V_2=C_3V_3[/tex]

where,

= concentration of given alcohol solution = 25 %

[tex]V_1[/tex] = volume of given alcohol solution = 100 ml

[tex]C_2[/tex] = concentration of another alcohol solution=65 %

[tex]V_2[/tex] = volume of another acid solution= x ml

[tex]C_3[/tex]  = concentration of resulting alcohol solution = 40 %

[tex]V_3[/tex] = volume of resulting acid solution = (100+x)

[tex]25\times 100+65\times x=40\times (100+x)[/tex]

[tex]x=60ml[/tex]

Thus 60 ml of the 65% mixture will you need to add to obtain the desired solution.

Answer:

We will produce 8.0 moles of HCl , this is 291.7 grams HCl

Explanation:

Step 1: Data given

Number moles of H2S = 3.0 moles

Step 2: The balanced equation

2HSbCl4 + 3H2S → Sb2S3 + 8HCl

Step 3: Calculate moles HCl

For 2 moles HSbCl4 we need 3 moles H2S to produce 1mol Sb2S3 and 8 moles HCl

For 3.0 moles H2S we'll have 8.0 moles HCl

Step 4: Calculate mass HCl

Mass HCl = moles HCl * molar mass HCl

Mass HCl = 8.0 moles * 36.46 g/mol

Mass HCl = 291.7 grams

We will produce 8.0 moles of HCl , this is 291.7 grams HCl

From the balanced equation, it is determined that 2 moles of HCl are produced from 1 mole of HSbCl4. Therefore, 6 moles of HCl will be produced from the reaction of an excess of HSbCl4 with 3 moles of H2S.

The balanced equation for the reaction is:

HSbCl4 + H2S → Sb2S3 + 2HCl

The mole ratio between HSbCl4 and HCl is 1:2, which means that for every 1 mole of HSbCl4, 2 moles of HCl are produced.

Since there is an excess of HSbCl4, we can assume that all 3 moles of H2S will react.

Therefore, the number of moles of HCl produced will be:

(3 moles H2S) x (2 moles HCl/1 mole HSbCl4) = 6 moles HCl

Answer:

The initial temperature is 300 K (The temperature doesn't change)

Explanation:

Step 1: Data given

Initial volume = 21L

Final volume = 14L

Initial pressure = 100 kPa = 0.986923 atm

Final pressure = 150 kPa = 1.48038 atm

The final temperature = 300K

Step 2: Calculate the initial temperature

Calculate the initial temperature

(P1*V1)/T1 = (P2*V2)/T2

⇒with P1 = the initial pressure = 0.986923 atm

⇒with V1 = the initial volume = 21 L

⇒ with T1 = the initial temperature = ?

⇒with P2 = the final pressure = 1.48038 atm

⇒with V2 = the final volume = 14 L

⇒with T2 = the final temperature = 300 K

(0.986923 * 21)/T1 = (1.48038*14)/300

T1 = 300 K

The initial temperature is 300 K (The temperature doesn't change)

Answer:

Mass ratio of ethanol to methanol in the liquid mixture = 202:1

Explanation:

Starting with a basis of 98.0 g

Amount of ethanol vapour in mass = 97 g

Amount of methanol vapour In mass = 1 g

Number of moles = (mass)/(molar mass)

Molar mass of ethanol = 46.07 g/mol

Molar mass of methanol = 32.04 g/mol

Number of moles of ethanol in the vapour = 97/(46.07) = 2.105 moles

Number of moles of methanol in the vapour = 1/(32.04) = 0.0312 mole

But we do know that

(Number of moles in gaseous form) = (number of moles in liquid state) × (Partial pressure).

Partial Pressure of ethanol = 60.5 torr

Partial pressure of methanol = 126.0 torr

(2.105) = (Number of moles of ethanol in the liquid state) × 60.5

number of moles of ethanol in the liquid state = 2.105/60.5 = 0.0348 moles/torr

(0.0312) = (Number of moles of methanol in the liquid state) × 126

number of moles of methanol in the liquid state = 0.0312/126 = 0.000248 moles/torr

We then convert these new number of moles in liquid state into masses

Mass = (Number of moles) × (molar mass)

(Mass of ethanol in the liquid state) = 0.0348 × 46.07 = 1.603 g/torr

(Mass of methanol in the liquid state) = 0.000248 × 32.04 = 0.00795 g/torr

Mass ratio of ethanol to methanol = (1.603/0.00795) = 201.7: 1 ≈ 202:1

The student's question pertains to finding the mass ratio of ethanol and methanol in a liquid mixture based on the mass ratio in the vapor phase using Raoult's law and the known vapor pressures of the alcohols. To answer accurately, additional data on mass or mole fractions is needed.

The student's question deals with the calculation of the mass ratio of alcohols, ethanol (C2H5OH) and methanol (CH3OH), in a liquid mixture based on the mass ratio in the vapor phase. To solve this problem, Raoult's law and the given vapor pressures of both alcohols must be used. Raoult's law states that the vapor pressure of a component in a mixture is equal to the mole fraction of the component in the liquid phase times the vapor pressure of the pure component.

With this information, and knowing the vapor pressure of ethanol is 44 torr and that of methanol is 94 torr at the same temperature, we could use the given vapor mass ratio (97/1) to calculate the mole fraction of each component in the vapor phase. Then, apply Raoult's law in reverse to find the mole fractions in the liquid phase, and finally, convert the mole fractions back into a mass ratio. The molecular weight of ethanol (46.07 g/mol) and methanol (32.04 g/mol) are used for this final step.

To proceed with the solution, more data regarding the mass or mole fractions in the liquid or vapor phase would be necessary. Without such data, we cannot fully determine the exact mass ratio in the liquid mixture.

Answer:

0.076M = [NOBr]

Explanation:

For the reaction:

2NO + Br₂ ⇄ 2 NOBr

The equilibirum constant, K, is defined as:

[tex]K = \frac{[NOBr]^2}{[NO]^2[Br_2]}[/tex](1)

Replacing the concentrations and the equilibrium value in (1):

[tex]1.3x10^{-2} = \frac{[NOBr]^2}{[0.89]^2[0.562]}[/tex]

5.79x10⁻³ = [NOBr]²

0.076M = [NOBr]

I hope it helps!

Answer:

P₂ = 5.55 atm

Explanation:

Mathematically, Boyle's law can be stated as:

[tex]{\displaystyle P\propto {\frac {1}{V}}}[/tex]

Pressure is inversely proportional to the volume

[tex]{\displaystyle PV=k}[/tex] Pressure multiplied by volume equals some constant [tex]{\displaystyle k}[/tex]

where P is the pressure of the gas, V is the volume of the gas, and k is a constant.

The equation states that the product of pressure and volume is a constant for a given mass of confined gas and this holds as long as the temperature is constant. For comparing the same substance under two different sets of conditions, the law can be usefully expressed as:

[tex]{\displaystyle P_{1}V_{1}=P_{2}V_{2}[/tex]

The  final  pressure   of a  gas  is calculated  using  Bolyes law  formula  

that is  P1V1 =P2V2

Because the temperature and number of moles remained constant, we can use the formula

P₁V₁=P₂V₂

3.00 L * 1.85 atm = P₂ * 1.00 L

P₂ = 5.55 atm

Answer:

Translation

Explanation:

Protein synthesis is the process of production of proteins in in the cells of living organisms. Transcription and Translation are the two main steps in the protein synthesis. The first step is completed in nucleus where mRNA is made using DNA as template. The second step i.e. translation occurs in the cytoplasm with the help of Ribosomes. The mRNA synthesized during transcription is pre-mRNA. After the processing it is assembled as mature RNA. After getting assembled the second step of protein synthesis viz. Translation begins in the cytoplasm.

Answer:

The pH is 7.54

Explanation:

The Henderson - Hasselbalch equation states that for a buffer solution which consists of a weak acid and its conjugate base, the buffer pH is given by:

pH [tex]=pk_{a} +log(\frac{[conjugate base]}{[weakacid]})[/tex]

pkₐ is for the acid

In this case, the buffer hypochlorous acid  HClO is a weak acid, and its conjugate base is the hypochlorite anion ClO⁻  is delivered to the solution via sodium hypochlorite NaClO .

NaCIO = 0.200 M

HCIO = 0.200 M

pkₐ = -log₁₀ kₐ = -log₁₀ (2.9 × 10⁻⁸) = 7.54

∴pH = [tex]=7.54 +log\frac{0.2}{0.2}[/tex] = 7.54

Answer: noble gas

Explanation:

Chemical bond is formed between atoms by losing gaining, or sharing electrons.

When the number of electrons and protons differ, it leads to the formation of ionic species. When an atom gains electrons, it will lead to the formation of negatively charged ion known as anion and when an atom looses electrons, it will lead to the formation of positively charged ion known as cation.

The atoms lose , gain or share electrons to achieve nearest noble gas configuration or to get stable.

Example : Sodium (Na) with atomic number 11 loses one electron to form [tex]Na^+[/tex] to get electronic configuration of neon with 1 0 electrons.

Answer:

We need 19.3 mL of HCl

Explanation:

Step 1: Data given

Molarity HCl = 5.00 M

Mass Zn = 3.15 grams

Step 2: The balanced equation

Zn (s) + 2HCl (aq) ⟶ ZnCl2 (aq) + H2 (g)

Step 3: Calculate moles Zn

Moles Zn = mass Zn / molar mass Zn

Moles Zn = 3.15 grams  / 65.38 g/mol

Moles Zn = 0.0482 moles

Step 4: Calculate moles HCl needed

For 2 moles HCl we need 1 mol Zn to produce 1 mol ZnCl2 and 1 mol H2

For 0.0482 moles Zn we need 2*0.0482 = 0.0964 moles HCl needed

Step 5: Calculate volume needed

Molarity = moles / volumes

Volumes = moles / molarity

Volume HCl needed = 0.0964 moles HCl /5.00 M

Volume HCl needed = 0.01928 L = 19.3 mL

We need 19.3 mL of HCl

Answer:

Molarity of stock HCl solution is 0.89 M

Explanation:

The given problem can be solved using laws of dilution.

According to laws of dilution-    [tex]C_{1}V_{1}=C_{2}V_{2}[/tex]

Where, [tex]C_{1}[/tex] and [tex]C_{2}[/tex] are initial and final concentration of a solution

            [tex]V_{1}[/tex] and [tex]V_{2}[/tex] are initial and final volume of a solution

Here, [tex]V_{1}=35.0mL[/tex], [tex]C_{2}=0.062M[/tex] and [tex]V_{2}=500mL[/tex]

So, [tex]C_{1}=\frac{C_{2}V_{2}}{V_{1}}[/tex] = [tex]\frac{(0.062M)\times (500mL)}{35.0mL}[/tex] = 0.89 M

Hence, molarity of stock HCl solution is 0.89 M

Answer:

K = 6.5 × 10⁻⁶

Explanation:

C₅H₆O₃(g) → C₂H₆(g) + 3 CO(g)

The formula for the ideal gas law

PV = nRT

where

P = total pressure

V = volume

n = total moles

R = gas constant

T = absolute temperature

P(C₅H₆O₃) = nRT/V

where

n = 5.63 /114

= 0.049

[tex]= \frac{0.049 * 0.0821 * 473}{2.5}[/tex]

= [tex]0.78atm[/tex]

C₅H₆O₃(g) ⇄ C₂H₆(g) + 3 CO(g)

0.78atm           0              0

0.78 - x            x              3x

P(total) = 1.63atm

0.78atm - x + x + 3x⇒x = 0.288atm

P(C₅H₆O₃)  = 0.78 - 0.288

                  = 0.489 atm

P(C₂H₆)  = 0.288 atm

P(CO) = 0.846 atm

[tex]Kp = \frac{0.288 * 0.864^3}{0.489}[/tex]

= 0.379

K = Kp/(RT³)

[tex]= \frac{0.379}{(0.0821 * 473)^3} \\= 6.5 * 10^-^6[/tex]

K = 6.5 × 10⁻⁶

The value of K for this reaction is : 6.5 * 10⁻⁶

The decomposition equation

C₅H₆O₃ ----> C₂H₆ (g) + 3 CO (g)

Given data :

mass of pure C₅H₆O₃ = 5.63 g

volume of flask = 2.50 L

Temperature = 200°C = 473 K

Pressure in flask = 1.63 atm

we will apply Ideal gas law formula

PV = nRT

therefore P( C₅H₆O₃ ) = nRT / V  ---- ( 1 )

where : n = 5.63 / 114 = 0.049,  V = 2.5 L,  R = 0.0821,  T = 473 k

Insert values into equation ( 1 )

P( C₅H₆O₃ ) = 0.78 atm - x  ---- ( 2 )

P(total) = 1.63 atm.

Considering the decomposition equation

0.78 - x + x + 3x = 1.63 atm

therefore ; x = 0.288

back to equation ( 2 )

P( C₅H₆O₃ ) = 0.78 - 0.288 = 0.489 atm

Given that :

P(C₂H₆) = 0.288 atm

P(CO) = 0.846 atm

Find K using the relationship below

K = Kp / ( RT)³  ------ ( 3 )

While Kp = ( 0.288 * 0.864³ ) / 0.489

               = 0.379

Back to equation ( 3 )

K = 0.379 / ( 0.0821 * 473 )³

  = 6.5 × 10⁻⁶.

Hence we can conclude that the value of K for this reaction is : 6.5 * 10⁻⁶

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Answer:

The price will be too low, and the output will be too large.

Explanation:

Answer:

The rate of formation of CO2 = 1.43 mol L-1s-1.

The rate of formation of H2O = 1.43 mol L-1s-1.

The rate of reaction of O2 = 1.43 mol L-1s-1.

Explanation:

2C6H14(g) + 19O2(g) -------> 12CO2(g) + 14H2O(g)

The rate of reaction of C6H14 is 1.43 mol L-1s-1.

The rate of reaction is theoretically defined as the speed of a chemical reaction. It is how fast or how slow the reactants are being used up or products are being formed.

It is the rate of change of concentration, amount etc., of any of the reactant or any of the product with time. The rate of reaction is the same and uniform for any of the products and reactants.

For a chemical reaction, A + 2B -----> 2C

r = -(dA/dt) = -(dB/dt) = (dC/dt)

Hence, the rate of reaction = rate of disappearance of C6H14 = rate of formation of CO2 = rate of formation of H2O = rate of reaction of O2 = 1.43 mol L-1s-1.

Hope this Helps!!!

The effects of changes in concentrations or volume on an equilibrium are predicted by Le Chatelier's principle. The reaction will typically shift to restore equilibrium in response to such changes. The exact direction of the shift depends on the specifics of the change in conditions.

This question refers to Le Chatelier's principle, which allows predictions about how a change in conditions will affect a chemical equilibrium. (a) By doubling the concentration of B and halving the concentration of C, you are disrupting the equilibrium. The reaction will shift to the right (towards C) to reestablish equilibrium. (b) Doubling the concentrations of both products and quadrupling the container volume will decrease pressure, and the reaction will shift towards the side with more moles of gas, which is the right in this case. (c) Doubling the container's volume also reduces the pressure, again causing the reaction to shift to the right. Likewise, (d) the increase of products will shift the equilibrium to the left to minimize the effect. (e) Adding more A will cause the reaction to shift to the right, resulting in the formation of more C. (f) Doubling the concentrations of both the products and the container volume has two opposing effects. The added products would shift the reaction to the left, while the increased volume would shift it to the right. Thus, the final shift in equilibrium is dependent on which effect is greater.

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The equilibrium of the reaction A(g) + B(s) \<=> 2C(g) will shift to counteract changes such as concentration and volume adjustments, consistent with Le Chatelier's principle.

The response of the reaction A(g) + B(s) \<=> 2C(g) at equilibrium to various changes can be explained by Le Chatelier's principle, which states that a system at equilibrium will adjust to minimize any changes applied to it.

Answer:

This type of error affects overall accuracy but does not necessarily affect precision. - Systematic error

This type of error affects precision but does not necessarily affect overall accuracy. - Random error

This type of error occurs if you use a buret that was calibrated incorrectly when it was made. - Systematic error

You can minimize this type of error by taking repeated measurements. - Random error

Explanation:

Systematic errors are errors that are attributable to instrument being used during measurement or consistent incorrect measurement during a research. They are consistently and repeatedly committed during measurements and therefore affect the overall accuracy of measurements. A person committing systematic error can have precise repeated measurement but will be far from being accurate.

Random errors on the other hand has no pattern and are usually unavoidable because they cannot be predicted. When sufficient replicate measurements are made, such errors are reduced to the barest minimum and usually do not affect the overall accuracy of measurements.

Answer:

D. Nitrogen Fixation

Explanation:

Nitrogen fixation is a process by which molecular nitrogen in the air is converted into ammonia (NH

3) or related nitrogenous compounds in soil.

Answer:

The answer to the question is

The equilibrium temperature T = 22.016 °C

Explanation:

To solve the question, we note the given variables thus

Mass of copper block =235 grams

Temperature of the copper block = 255 °C

Mass of aluminium calorimeter cup = 155 g

Mass of water in calorimeter cup = 16 °C

Also we note the specific heat capacities of the materials involved in the question

Specific heat capacity of water = 4.186 joule/gram

Specific heat capacity of copper= 0.385 joule/gram

Specific heat capacity of aluminium = 0.900  joule/gram

There for from the first law of thermodynamics, energy is neither created nor destroyed but it changes from one form to another, we have

Heat lost by copper = heat gained by water and the calorimeter cup

Therefore we have

The equation for heat capacity =

mass * specific heat capacity * Temperature change  = m·c·ΔT

therefore

m·c·ΔT for copper = m·c·ΔT for aluminium + m·c·ΔT for water

where ΔT on the left of the equation = Initial temperature - final temperature

while on the right  ΔT = Final temperature - Initial temperature

and the final temperature in this case = the equilibrium temperature

255*0.385*(255 -T) = 155*0.9*(T-16) +875*4.186*(T-16)

Which gives the equilibrium temperature T = 22.016 °C

The equilibrium temperature when a 235 g copper block at 255 °C is placed in a 155 g aluminum calorimeter cup containing 875 g of water at 16.0 °C can be found by applying conservation of energy. The heat lost by the hot copper block is equal to the heat gained by the water and the aluminum calorimeter. By setting up and solving this equation, we can determine the final equilibrium temperature.

In this calorimeter scenario, we have a hot copper block transferring its heat to the colder aluminum calorimeter and the water it contains. As per the law of conservation of energy, the heat lost by the hot copper block will be equal to the heat gained by the water and the aluminum calorimeter. We can express this mathematically as:
     (mass of copper)x(specific heat of copper)x(temperature change of copper) = (mass of water)x(specific heat of water)x(temperature change of water) + (mass of aluminum)x(specific heat of aluminum)x(temperature change of aluminum).

Given the specific heat of aluminum is 0.897 J/g °C, water is 4.184 J/g °C and copper is 0.390 J/g °C, we can substitute these values, as well as the rest of given values, into the equation and solve for the common final temperature, which represents the equilibrium temperature.

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Answer:

b. 2 mol of KI in 500. g of water

Explanation:

We have to apply the colligative property of freezing point depression.

The formula is: ΔT = Kf . m . i

As the (Kf . m . i) is higher, then the freezing temperature will be lower.

i refers to the Van't Hoff factor (number of ions dissolved in the solution)

KI → K⁺ + I⁻    (i =2)

Kf is constant so, we have to search for the highest m (molality)

Molality means the moles of solute in 1kg of solvent.

The highest m is option b → 2 mol of KI / 0.5 kg = 4 mol/kg

a. 1 mol of KI / 0.5 kg = 2 mol/kg

c. 1 mol of KI / 1kg = 1 mol/kg

d. 2 mol of KI / 1kg = 2 mol/kg

1000 g = 1kg. In order to determine molality we need to convert the mass (g) of solvent to kg

Answer:

2. Option B.

Explanation:

H₂SO₄ + Ba(OH)₂ → BaSO₄ + 2H₂O

You can count 2H in sulfuric acid and 2 H in the barium hyrdoxide, so the coefficient for water must be 2.

You will have 4 H on both sides of the reaction.

Try with the dissociations of each reactant

Sulfuric acid ⇒ H₂SO₄ →  2H⁺  + SO₄⁻²

Barium hydroxide ⇒ Ba(OH)₂ → Ba²⁺  +  2OH⁻

Sulfate anion bonds to barium cation to produce the salt, therefore the 2 protons will bond the 2 hydroxide in order to produce, 2 moles of H₂O

2H⁺ + 2OH⁻ → 2H₂O