Answer to Question #330583 in General Chemistry for Bob

Question

When 8.00 grams of methane reacts it produces 2.4 L of hydrogen gas at 300 K. What is the pressure of the

hydrogen gas?

Answer 1

CH₄ + H₂O = CO + 3H₂

n(CH₄) = n(CH₄) / Mr(CH₄) = 8.00 g / 16.0 g/mol = 0.5 mol

1 mol CH₄ - 3 mol H₂

0.5 mol CH₄ - x mol H₂

x = 0.5 × 3 = 1.5 mol

PV = nRT

P = nRT / V = (1.5 mol)(0.0821 L atm/mol K)(300 K) / (2.4 L) = 15.4 atm