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Question
Hydrogen and oxygen combine in the ratio of 1:8 by mass to form water. What mass of oxygen gas would be required to react completely with 3 g of hydrogen gas?
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Solution
Hydrogen : Oxygen = 1 : 8
1g of hydrogen requires 8g of oxygen.
So, the mass of oxygen gas required to completely combine with 3g of hydrogen gas is
Oxygen = (8 × 3)g
= 24g
A mass of 24g of oxygen gas will be required to completely combine with 3g of hydrogen gas.
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