With the complete combustion of 26 g of methane CH4 in oxygen with the formation of carbon dioxide

With the complete combustion of 26 g of methane CH4 in oxygen with the formation of carbon dioxide and water, 891 kJ are released. Write a thermochemical equation for the reaction. Calculate what the thermal effect of the reaction will be.

1. Let’s write down the reaction scheme:

CH4 + 2O2 → CO2 + 2H2O + Q;

2.find the chemical amount of methane:

n (CH4) = m (CH4): M (CH4);

M (CH4) = 12 + 4 = 16 g / mol;

n (CH4) = 26: 16 = 1.625 mol;

3.Calculate the thermal effect of the methane combustion reaction, for this we make up the proportion:

1.625 mol – 891 kJ, that is, the combustion of 1.625 mol gives 891 kJ of heat;

1 mol – x kJ, and combustion of 1 mol – x kJ of heat;

x = 1 * 891: 1.625;

x = 548.3 kJ, thus, when 1 mol of methane is burned, 548.3 kJ of heat is released.

Answer: CH4 + 2O2 → CO2 + 2H2O + 548.3 kJ.