Asked by Rachel

how many molecules of ethane c2h6 are present in .257 g of C2H6?
thank you

i got 5.14 x10^21



Answered by R_scott
the molar mass is ... 30.07 g

moles = mass / molar mass

molecules = moles * 6.02E23
Answered by Rachel
so was i correct?
(.257 x 6.023 x 10^23)/ 30.07 = 5.14 x 10^21
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