Question

what is the ratio of the number of molecule in 71g of chlorine to the number of molecule in 2g of hydrogen

Answer 1

As molar mass of chlorine(Cl2) = 71g 
hence , 71 g of chlorine contains 6.022 x 10²³ molecules
and, molar mass of hydrogen gas(H2) = 2 g
hence , 2g of it  contains 6.022 x 10²³ molecules 

So,  ratio is 1:1

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