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Answer to Question #18051 in Inorganic Chemistry for Alisha

Question #18051
Estimate the amount of heat released (in kj/mol) when 10g of CH4 gas reacts with an excess of O2 gas to form gaseous CO2 and liquid water. The molar mass of CH4 is 16.042
Expert's answer
CH4(g) + 2O2(g) = CO2(g) + 2H2O
(liq)∆H = 2∆H(H2O) + ∆H(CO2) - ∆H(CH4)
∆H = 2 * (-285,8) +(-393,5) + 74,6 = -890,5 kj/mol
Q = n * ∆H;
n = 10/16.042 = 0.623 mol;
Q = 0.623 mol * (-890,5 kJ/mol);
Q = -555.11 kJ

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