What is the number of moles of PbCl₂ formed when 6.5 g of PbO reacts with 3.2 g of HCl?

1. 0.044
2. 0.333
3. 0.011
4. 0.029

Which of the following volumes of concentrated H₂SO₄ (98% by mass, density = 1.80 g/mL) is required to prepare 1 L of 0.1 M H₂SO₄ solution?

A 2.74 g sample of vanadium oxide contains 1.53 g of vanadium. Given V = 52, determine the empirical formula of the oxide.

1. ${\mathrm{V}}_2{\mathrm{O}}_3$

2. $\mathrm{VO}$

3. ${\mathrm{V}}_2{\mathrm{O}}_5$

4. ${\mathrm{V}}_2{\mathrm{O}}_7$

When 25.4 g of I₂ reacts completely with 14.2 g of Cl₂ to form a mixture of ICl and ICl₃, what are the moles of ICl and ICl₃ formed, respectively?

1. 0.5, 0.2

2. 0.1, 0.1

3. 0.1, 0.3

4. 0.3, 0.4

Which of the following represents the number of moles of NO₂ present in a 100 g mixture of NO₂ and N₂O₄ having a vapour density of 38.3?

[Given: Vapour density = Molar mass/2]

1. 0.437

2. 0.347

3. 0.557

4. 0.663

The average molar mass of the mixture of ${\mathrm{CH}}_4$ $$and ${\mathrm{C}}_2{\mathrm{H}}_4$ present in the mole ratio of a:b is
20 g mol^-1. When the mole ratio is reversed, the molar mass of the mixture will be:

An organic compound contains carbon, hydrogen, and oxygen. If elemental analysis reveals 38.71% carbon and 9.67% hydrogen, which of the following is its empirical formula?

What volume of oxygen gas is required for the complete combustion of 1 L of propane gas, C₃H₈, when both gases are measured at 0°C and 1 atm?
1. 7 L
2. 6 L
3. 5 L
4. 10 L