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A gas sample contains 4.0 g of ch4 and 2.0 g of he. what is the volume of the sample at stp?

Kristi Hammond

in Chemistry

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Jeremy Wood on July 9, 2018

Answer:Volume = 16.8 LitersExplanation:in the First place, we must obtain the number of moles of the sample in the following way:number of moles = mass / molar massnumber of mole of CH4 = 4 / (12+4) = 4 / 16 = 0.25 molesnumber of moles of He = 2 / 4 = 0.5 molesTotal the number of moles of sample = 0.25 + 0.5 = 0.75 molesNow, at STP, one mole of any gas occupies a volume of 22.4 Liters. To know the volume occupied by 0.75 mol at STP, all you have to do is cross multiplication, in the following manner:1 mol of .............> 22.4 liters0.75 mol .......> ?? litersVolume = (0.75*22.4) / 1Volume = 16.8 litersHope this helps :)


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