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Question

$$Ca + 2H_{2}O\rightarrow Ca(OH)_{2} + H_{2}$$
What volume of hydrogen gas is produced from $$20.0\ g$$ of calcium and $$20.0\ g$$ of water?


A
0.059 L
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B
5.46 L
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C
11.2 L
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D
22.4 L
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Solution

The correct option is C $$11.2\ L$$
$$Ca  + 2H_2O \rightarrow Ca(OH)_2 + H_2$$
20 g   20 g

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

Ca is limiting reagent so mol of hydrogen produce 0.5 mol 

Volume $$= 22.4 \times 0.5 = 11.2$$ L                                     

Chemistry

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