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Given the reaction: Ca + 2H2O Ca(OH)2 + H2 What is the total number of moles of Ca needed to react completely with 4.0 moles of H2O?

Given the reaction: Ca + 2H2O → Ca(OH)2 + H2
What is the total number of moles of Ca needed to react completely with 4.0 moles of H2O?

1. 1.0
2. 2.0
3. 0.50
4. 4.0

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