Question

For the reaction CH4 + 202 -> CO2 +2H20, how many grams of H20 are produced from the combustion of100. g of CH4?

Answer 1

Step 1

The reaction:

CH4 + 2O2 => CO2 +2H2O (already balanced)

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Step 2

Information needed:

The molar mass of CH4 (16.0 g/mol) and H2O (18.0 g/mol)

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Step 3

By stoichiometry:

1 mol CH4 = 16.0 g

1 mol H2O = 18.0 g

Procedure:

16.0 g CH4 -------- 2 x 18.0 g H2O

100. g CH4 -------- X

X = 100. g CH4 x 2 x 18.0 g H2O/16.0 g CH4 = 225. g H2O

Answer: 225. g H2O