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Q.

34.05 mL of phosphorus vapour weighs = 0.00625 g at 546°C and 0.1 bar pressure. What is the molar mass of phosphorus?

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a

120.46 gmol-1

b

128.43 gmol-1

c

125.04 gmol-1

d

112.46 gmol-1

answer is C.

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Detailed Solution

p V=n R TpV=mRTM (m = mass of phosphorus andM=mRTpV M = molar mass of phosphorus)M=0.0625 g×0.0821 L atm K-1 mol-1×819 K0.1×0.987 atm×0.03405 LM=1250.4 g mol-1

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34.05 mL of phosphorus vapour weighs = 0.00625 g at 546°C and 0.1 bar pressure. What is the molar mass of phosphorus?