What mass of carbon dioxide is produced from the complete combustion of 4.1010?3

Question

What mass of carbon dioxide is produced from the complete combustion of 4.1010?3 of methane? What mass of water is produced from the complete combustion of 4.1010?3 of methane? What mass of oxygen is needed for the complete combustion of 4.1010?3 of methane?

Explanation / Answer

his is the balanced combustion reaction of methane: CH4 + 2O2 ----> CO2 + 2H2O First calculate how many moles of methane were used. The molar mass of methane is 16.011g/mol. Moles of CH4 = 3.60x10^-3g / 16.011g per mol = 0.000225 mol CH4 From the balanced reaction you can see that for every 1 mole of CH4, there are 2 moles of H2O produced. So, for CH4 = 0.000225 moles, H2O (0.000225x2) = 0.000450 moles Now convert moles of water to grams: 0.000450 x 18g per mol = 0.0081 g water

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