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A mole of any substance contains 6.023xx...

A mole of any substance contains `6.023xx10^(23)` particles. The particles may be atom, molecule ions, electron, proton or neutron. One mole of atom is equal to 1 gm -atom which is equal to atomic weight of atom. 1 gm molecule of any gas is 1 mole of gas whose volume is 22.4 litre at N.T.P.
Mass of 1 atom of an element `X_(2)` is `6.64xx10^(-23)gm`. Molecular weight of `X_(2)` is

A

80

B

60

C

40

D

20

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The correct Answer is:
A
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