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Question

What volume is occupied by 100.0 grams of oxygen gas (O2) at STP?

A
140L
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B
35L
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C
280L
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D
70L
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Solution

The correct option is D 70L
number of moles=weightmolecular weight
100.0g O2 at STP =10032=3.125 moles
1 mole gas at STP occupies volume=22.4L
3.125 moles=22.4×3.125=70L

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