MC Ch4 #3 B&C The coefficients in a balanced chemical equation provide the mole-
ID: 882652 • Letter: M
Question
MC Ch4 #3 B&C
The coefficients in a balanced chemical equation provide the mole-to-mole stoichiometry among the reactants and products. The molar mass (in g/mol) can be used as the conversion factor between moles and the mass of a substance. Thus, the balanced equation and molar masses can be used in conjunction with one another to calculate the masses involved in a reaction. Part B What mass of carbon dioxide is produced from the complete combustion of 4.40x 10^-3 g of methane? Part C What mass of water is produced from the complete combustion of 440x10^-3 g of methane? Express your answer with the appropriate units.Explanation / Answer
CH4 + 2 O2 -----> CO2 + 2 H2O
no of moles of CH4 = (4.40X 10-3) / 16 = 2.75 X 10 -5 mol
no of moles of CO2 produced would also be 2.75 X 10 -5 mol (the molar ratio of CH4 result in CO2 of same molar ratio that is 1 : 1 )
so the the mass of CO2 = 2.75 X 10 -5 / ( 12+ 2 (16) ) = 13.2 g
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