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Q.

The measured density of heluim at NTP is  0.1784 g L−. The wt. of 1 mol of helium is :

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a

1g⋅mol−

b

2g⋅mol−

c

3g⋅mol−

d

4g.mol−

answer is D.

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Detailed Solution

1 mol of He occupies volume = 22.4 Lat NTP.Given. 1 L He weigh= 0.1784 g.22.4 L He weigh =0.1784g1L×22.4L=3.996≃4gmol−
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The measured density of heluim at NTP is  0.1784 g L−. The wt. of 1 mol of helium is :