Question

Density of a gas is 0.009 g/cc at STP. Calculate its atomic mass.

Answer 1

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11th

Chemistry

Some Basic Concepts of Chemistry

Atomic and Molecular Masses

The mass of 94.5 ml of a ga...

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Asked on January 17, 2020 by

Gurram Nagar

The mass of 94.5 ml of a gas at S.T.P. is found to be 0.2231 g. Calculate its molecular mass.

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ANSWER

Given:-

Mass of gas= 0.2231g

Volume of gas at S.T.P= 94.5ml=94.5×10

−3

litre or dm

3

To find:- Molecular mass

Solution:-

22.4dm

3

VolumeoccupiedbygasatSTPindm

3

=Number of moles

⇒

22.4dm

3

94.5×10

−3

dm

3

= Number of moles

⇒ Number of moles= 0.0042

Number of moles=

Molecularmass

Weight

∴ Molecular mass=

Numberofmoles

0.2231g

=

0.0042mole

0.2231g

=53.11g/mile