Question

Calculate the number of liters occupied at STP. A. 1.7 mol H2. B. 1.8 x10(-2) mol N2. C. 2.5 x10(2) mol O2

Answer 1

Ideal Gas equation will be used assuming all the gases are acting Ideally,

P V = n R T
Solving for V,
V = n R T / P ----- (1)

Standard Temperature = 273 K

Standart Pressure = 1 atm

Gas Constant R = 0.08206 atm.L.mol⁻¹.K⁻¹

1) For 1.7 mole of H₂;
Putting values in eq.1,

V = (1.7 mol × 0.08206 atm.L.mol⁻¹.K⁻¹ × 273 K) ÷ 1 atm

V = 38.08 L

2) For 1.8 ×10⁻² mole of N₂;
Putting values in eq.1,

V = (1.8 ×10⁻² mol × 0.08206 atm.L.mol⁻¹.K⁻¹ × 273 K) ÷ 1 atm

V = 0.403 L

3) For 2.5 ×10² mole of O₂;
Putting values in eq.1,

V = (2.5 ×10² mol × 0.08206 atm.L.mol⁻¹.K⁻¹ × 273 K) ÷ 1 atm

V = 5600 L