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# Higher Chemistry Calculations - need help please, anyone watch

1. This is the question, hope it makes sense:

phosphorus forms two hydrides, PH3 and P2H4. 0.152g of a hydride of phosphorus has a volume of 100ml. identify the gas if it has a molar volume of 23.0 litres mol-1
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I'm going to quote in Tank Girl now so she can move your thread to the right place if it's needed.

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(Original post by Tank Girl)
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3. (Original post by Misshussain23)
This is the question, hope it makes sense:

phosphorus forms two hydrides, PH3 and P2H4. 0.152g of a hydride of phosphorus has a volume of 100ml. identify the gas if it has a molar volume of 23.0 litres mol-1
Work out the molar masses of the two hydrides. Then you know that 0.152 g occupies 0.1 litres so therefore 23 litres (1 mol) weighs 230*0.152 g. One of the two hydrides will have this molar mass
4. (Original post by langlitz)
Work out the molar masses of the two hydrides. Then you know that 0.152 g occupies 0.1 litres so therefore 23 litres (1 mol) weighs 230*0.152 g. One of the two hydrides will have this molar mass
thankyou

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