1.

19.7 kg of gold was recovered from a smuggler. How many atoms of gold were recovered ? (Au = 197).

Answer»

100
`6.02 XX 10^23`
`6.02 xx 10^24`
`6.02 xx 10^25`

Solution :197 G of gold ` = 6.02 xx 10^23 ` atoms` 19.7 xx 10^3 g` of gold
`(6.02 xx 10^23)/(197) xx 19.7 xx 10^3= 6.02 xx 10^25`


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