The average atomic mass of chlorine using the following data would be:

Isotope	% Natural Abundance	Molar Mass
35Cl	75.77	34.9689
37Cl	24.23	36.9659

1. 38.4527 u

2. 37.4527 u

3. 36.4527 u

4. 35.4527 u

Determine the number of moles of hydrogen atoms present in 3 moles of ethane (C₂H₆):

1. 18.069 × 10²³

2. 1.8 × 10²³

3. 18

4. 6 × 10²³

Find the concentration of sugar, C₁₂H₂₂O₁₁, in mol L⁻¹ when 20 g of sugar is dissolved in enough water to make 2 L of solution.

1. 0.29 mol/L

2. 0.029 mol/L

3. 0.35 mol/L

4. 0.032 mol/L

How much volume of methanol is needed to prepare 2.5 L of a 0.25 M solution, if the density of methanol is 0.793 kg/L?

1. 22.25 mL
2. 24.78 mL
3. 25.22 mL 
4. 28.52 mL

If the mass of air above a unit area at sea level is 1034 g cm⁻², what is the corresponding atmospheric pressure in pascal?

1. 1.01332 × 10⁵ Pa

2. 1.01332 × 10⁶ Pa

3. 1.01332 × 10⁷ Pa

4. 1.01332 × 10⁸ Pa

Which of the following is the SI unit of mass?

1. Kilogram (kg)

2. Gram (g)

3. Pascal (Pa)

4. Kilometres (km)

Which of the following correctly defines significant figures ?

The chloroform contamination level in water is 15 ppm (by mass of chloroform). Calculate the molality of chloroform in this water sample, which represents the number of moles of chloroform dissolved per kilogram of pure water solvent:

For the reaction:
A + B₂ → AB₂
Which of the following cases represent situations in which A acts as the limiting reagent?

 
Choose the correct option:

If 10 volumes of H₂ react completely with 5 volumes of O₂, what volume of water vapor will be produced under the same conditions of temperature and pressure?

1. Nine (9)

2. Eight (8)

3. Ten (10)

4. Eleven (11)