5-6 litres of a gas weighs 1 g at STP- The gas can be-A- HeB- N 2C- H 2D- O 2

The correct option is A HeNumber of moles of gas 5.622.4=14 Number of moles=WeightMolecular weight =14=1Molecular weight⇒Molecular weight=4 Molecular weight ...

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Standard XII

Chemistry

Mole Concept

5.6 litres of...

Question

5.6 litres of a gas weighs $1 g$ at STP. The gas can be:

H_{2}

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N_{2}

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H e

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O_{2}

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Solution

Step 1:
Number of moles of gas $\frac{5.6}{22.4} = \frac{1}{4}$

$Number of moles = \frac{Weight}{Molecular weight}$
Step 2:
Number of moles = $\frac{1}{4} = \frac{1}{M o l e c u l a r w e i g h t}$
$M o l e c u l a r w e i g h t = 4$
Molecular weight 4 is possible only for He out of the given options.
Hence, option (A) is correct.

Suggest Corrections

5.6 litres of a gas weighs 1 g at STP. The gas can be:

Step 1: Number of moles of gas 5.622.4=14 Number of moles=WeightMolecular weightStep 2: Number of moles = 14=1Molecularweight Molecularweight=4 Molecular weight 4 is possible only for He out of the given options. Hence, option (A) is correct.

5.6 litres of a gas weighs $1 g$ at STP. The gas can be: