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a
6.02 × 1023 atoms of H
b
4 g atom of Hydrogen
c
1.81 × 1023 molecules of CH4
d
3.0 g of carbon
answer is B.
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Detailed Solution
1 mole of CH4 contains (1) 4 mole of hydrogen atom, i.e., 4 g atom of hydrogen. (2) 4×6.023×1023 atoms of ‘H’ (3) 6.023×1023 molecules of CH4 (4) 12 gm of Carbon