1.

Which of the following weighs the most?

Answer»

`10^23` molecules of `H_2`
1 MOLE of `H_2O`
1 mole of `N_2`
`10^22` atoms of oxygen

Solution :(i) `10^23` molecules of `H_2`
`= (10^23)/(6.02 XX 10^23) = 0.167` moles of `H_2`
` = 0.167 xx 2= 0.234g H_2`
(II) 1mole of `H_2O = 1 xx 2 + 16 = 18g H_2O`
(iii) 1 mole of `N_2 = 2 xx 14 = 28 g N_2`
(iv) `10^22` atoms of O
` = (10^22)/(6.02 xx 10^23) = 0.0167` moles of O
` = 0.0167 xx 16 = 0.2672 g O`


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