Q.

1 gram of hydrogen contains 6×1023 atoms. Then 4 grams of He contains

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a

6×1023 atoms

b

24×1023 atoms

c

1.5 × 1023 atoms

d

12×1023 atoms

answer is A.

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Detailed Solution

For noble gases, atomic mass is equal to molecular mass. Because they are mono atomic in the state.

4 gram of He = 1 mol He atoms = 6.023×1023 atoms=6×1023 atoms

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