1.

Which of the following will have maximum mass?

Answer»

0.1 mole of `NH_(3)`
1022 ATOMS of CARBON
1022 molecules of `CO_(2)`
1 g of Fe

Solution :Hint : `"0.1 mole of "NH_(3)" has "6.023xx10^(23)" atoms"`
Mass of 1 mole of `NH_(3)=17g`
`therefore"Mass of 0.1 mole of "NH_(3)=1.7g`
(B) Mass of 1022 atoms of carbon
`6.023xx10^(23)" c atoms of carbon" 6.023xx10^(23)" c atoms mass = 12 g"`
`therefore"1022 atoms of C has the mass"`
`=(12)/(6.023xx10^(23))xx1022=2.036xx10^(-20)g`
(c ) Mass of 1022 molecules of `CO_(2)`
`CO_(2)=` molar mass = 44 g
`6.023xx10^(23)CO_(2)` molecules has the mass = 44 g
`therefore 1022 CO_(2)` molecules has the mass `=(44)/(6.023xx10^(23))xx1022=7.466xx10^(-20)g`
(d) 1 g of Fe
`therefore` (a) 1.7 g of `NH_(3)` has the highest mass.


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