Consider the following two reactions. How much water (in grams) is produced from 10.0 g of Mg?

Question

Consider the following two reactions.  How much water (in grams) is produced from 10.0 g of Mg?

Quizplus · Accepted Answer

The balanced equation shows that 1 mol of Mg reacts with 1 mol of water to produce 1 mol of Mg(OH)2 and 1/2 mol of hydrogen gas. The molar mass of Mg is 24.31 g/mol, so 10.0 g of Mg is equivalent to approximately 0.41 mol. According to the balanced equation, 1 mol of Mg reacts with 1 mol of water to produce 1 mol of Mg(OH)2 and 1/2 mol of hydrogen gas. Therefore, 0.41 mol of Mg will react with 0.41 mol of water to produce 0.41 mol of Mg(OH)2 and 0.205 mol of hydrogen gas. The molar mass of water is 18.02 g/mol, so 0.41 mol of water is approximately 7.41 g. Therefore, 7.41 g of water is produced.

Consider the Following Two Reactions