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Question

Hydrogen and oxygen combine in a ratio of 1:8 by mass to form water. What mass of oxygen gas is required to react completely with 3g of hydrogen gas?


A

8 g

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B

16 g

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C

24 g

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D

32 g

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Solution

The correct option is C

24 g


Hydrogen and oxygen combine in a ratio of 1:8 means that 1g of hydrogen gas requires 8g of oxygen gas to form water.

Therefore, 3g of hydrogen gas will require = 8 × 3 = 24 g of oxygen

Thus, 24g of the oxygen gas is required to react completely with 3 g of hydrogen gas to form water.


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