QuestionApril 14, 2026

6. Given the reaction: Ca+2H_(2)Oarrow Ca(OH)_(2)+H_(2) How many moles of H_(2)O are needed to exactly react with 2.0 moles of Ca? 1.0 mol 20 mol 0.5 mol 4.0 mol

6. Given the reaction: Ca+2H_(2)Oarrow Ca(OH)_(2)+H_(2) How many moles of H_(2)O are needed to exactly react with 2.0 moles of Ca? 1.0 mol 20 mol 0.5 mol 4.0 mol
6. Given the reaction: Ca+2H_(2)Oarrow Ca(OH)_(2)+H_(2) How many moles of H_(2)O are needed to exactly react with 2.0 moles of Ca? 1.0 mol 20 mol 0.5 mol 4.0 mol

Solution
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Answer

4.0 mol Explanation 1. Identify mole ratio from reaction From Ca + 2H_{2}O \rightarrow Ca(OH)_{2} + H_{2}, 1 mole of Ca reacts with 2 moles of H_{2}O. 2. Calculate required moles of H_{2}O For 2.0 moles of Ca: 2.0 \times 2 = 4.0 moles of H_{2}O.

Explanation

1. Identify mole ratio from reaction <br /> From $Ca + 2H_{2}O \rightarrow Ca(OH)_{2} + H_{2}$, 1 mole of Ca reacts with 2 moles of $H_{2}O$. <br /><br />2. Calculate required moles of $H_{2}O$ <br /> For 2.0 moles of Ca: $2.0 \times 2 = 4.0$ moles of $H_{2}O$.
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