Question

9. A balloon contains 0.02 g of H2 gas. It contains how
many H2 molecules?
(a) 6.02 x 1023
3
(b) 3.01 x 1022
(c) 6.02 X 1024
(d) 3.01 X 1024
0.02
​

Answer 1

Answer:

6.022×10^21

Explanation:

Number of moles of H2 present in the balloon is calculated by -

n = W / M

n = 0.02 / 2

n = 0.01 mol

Number of molecules of H2 present in the balloon is calculated by -

N = n × NA

N = 0.01 × 6.022×10^23

N = 6.022×10^21 molecules

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