A stoichiometric reaction is initiated by filling a sealed steel vessel with 10 g of hydrogen gas and 64 g of oxygen gas, followed by an ignition to trigger an explosion. Determine the total number of moles of water (\(\text{H}_2\text{O}\)) produced by this combustion reaction once the limiting reactant is completely consumed:

1. 2 moles

2. 3 moles

3. 4 moles

4. 1 mole

How many atoms are present in 0.1 mole of a triatomic gas?

Given: Avogadro constant, Nₐ = 6.02 × 10²³ mol⁻¹

Find the mass of precipitate formed when 50 mL of 16.9% (w/v) AgNO₃ solution is mixed with 50 mL of 5.8% (w/v) NaCl solution.

(Ag = 107.8, N = 14, O = 16, Na= 23,Cl=35.5)

Which of the following quantities would change if Avogadro’s number were changed from 6.022 × 10²³ mol⁻¹ to 6.022 × 10²⁰ mol⁻¹?

1. The definition of mass in units of grams.

2. The mass of one mole of carbon.

3. The ratio of chemical species to each other in a balanced equation.

4. The ratio of elements to each other in a compound.

An organic compound has the following composition by mass: C = 40.687%, H = 5.085%, O = 54.228%. Given vapour density = 59, find its molecular formula.

1. C₄H₆O₄

2. C₄H₆O₂

3. C₄H₄O₂

4. None of the above

How many gram-molecules of oxygen are present in 6.02 × 10²⁴ molecules of CO?

1. 10 g molecules

2. 5 g molecules

3. 1 g molecules

4. 0.5 g molecules

Which of the following gases would have a mass of 4.4 g for a volume of 2.24 L at NTP?

Calculate the mass of iron obtained when 200 kg of Fe₂O₃ ore containing 20%
impurities is completely reduced by CO.

1. 84 kg

2. 200 kg

3. 56 kg

4. 112 kg

Calculate the number of ions present in 2L of a solution of 1.6 M K₄[Fe(CN)₆]:

What is the ratio of the number of atoms in 2.2 g of CO₂ and in 1.7 g of NH₃?