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What is the weight of `3.01xx10^(23)` molecules of ammonia?

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What is the weight of `3.01xx10^(23)` molecules of ammonia?
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`6.023xx10^(23)` molecules of `NH_(3)` has weight `= 17 g`
`:. 3.01xx10^(23)` molecules of `NH_(3)` has weight
`=(17xx3.01xx10^(23))/(6.023xx10^(23))= 8.50 g`
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