1.

Which of the following contains the largest number of molecules?

Answer»

0.2 mole of `H_2`
8.0 g of `H_2`
17 g of `H_2O`
6.0 g of`CO_2`

Solution :(i) 0.2 mole of `H_2`
`=0.2 xx 6.02 xx 10^23`
`= 1.204 xx 10^23` molecules of `H_2`
(II) 8.0 g `H_2 = (8.0)/(2) = 4.0` mole `H_2`
` = 4.0 xx 6.02 xx 10^23= 2.408 xx 10^24` molecules of `H_2`
(iii) 17.0 g `H_2O = 17/18` MOLES of `H_2O`
` = 17/18 xx 6.02 xx 10^23`
`= 5.685 xx 10^23` molecules of `H_2O`
(IV) 6.0g of `CO_2 = (6.0)/(44)` moles of `CO_2`
` = (6.0)/(44) xx 6.02 xx 10^23`
` = 8.21 xx 10^22` molecules of `CO_@`


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