Consider the thermochemical equation 2C₂H₆(g) + 7O₂(g) → 4CO₂(g) + 6H₂O(ℓ) ; ΔH = -3,120 kJ
What amount of oxygen can consume 6,240 kJ of energy? (Molar masses: C₂H₆ = 30.0 g; O₂ = 32.0 g) ?

Question

Quizplus · Accepted Answer

The reaction releases 3,120 kJ for 7 moles of O₂. To consume 6,240 kJ, double the amount of O₂ is needed, which is 14 moles. The mass of 14 moles of O₂ is 14 * 32.0 g/mol = 448 g.

Consider the Thermochemical Equation 2C2H6(g) + 7O2(g) → 4CO2(g)

Consider the Thermochemical Equation 2C₂H₆(g) + 7O₂(g) → 4CO₂(g)