Answer to Question #181775 in Chemistry for jeje jiji jojo

Question

CH4 + 2O2 ----> CO2 + 2H2O  Heat released is 890.4kJ

How much heat is released by burning 15g of CH4?

Answer 1

Solution:

The balanced thermochemical equation:

CH₄ + 2O₂ → CO₂ + 2H₂O, △H = -890.4 kJ

 

The equivalences for this thermochemical equation are:

1 mol CH₄ ⇔ 2 mol O₂ ⇔ 1 mol CO₂ ⇔ 2 mol H₂O ⇔ -890.4 kJ

 

Convert the amount of methane (CH₄) to moles:

15 g CH₄ × (1 mol CH₄ / 16 g CH₄) = 0.9375 mol CH₄

 

Use the thermochemical equation to determine the heat:

0.9375 mol CH₄ × (890.4 kJ / 1 mol CH₄) = 834.75 kJ

 

Answer: 834.75 kJ of heat is released by burning 15 g of CH₄.