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Volume of Gases and Number of Moles

Ca + 2H2O→ Ca...

Question

$C a + 2 H_{2} O \to C a (O H)_{2} + H_{2}$
What volume of hydrogen gas is produced from $20.0 g$ of calcium and $20.0 g$ of water?

0.059 L

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5.46 L

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11.2 L

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22.4 L

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Solution

The correct option is C $11.2 L$
$C a + 2 H_{2} O \to C a (O H)_{2} + H_{2}$
20 g 20 g

$\frac{20}{40}$ = 0.5 mol $\frac{20}{18 \times 2}$ = 0.55 mol

Ca is limiting reagent so mol of hydrogen produce 0.5 mol

Volume $= 22.4 \times 0.5 = 11.2$ L

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