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At standard temperature and pressure (STP), one mole of a gas is 22.4L.

So, in order to determine how many moles of O2 are in 30L, you do the following:

multiply 30L O2 x 1mol O2/22.4L O2, which equals 1.34mol O2.

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βˆ™ 2011-07-31 21:50:51
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Q: How many moles of oxygen in 30L of oxygen gas?
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