Answers

2016-02-07T16:23:57+05:30
given mass of He (m) = 60 g
molar mass of He (M) = 4 g
so number of moles in 60 g of helium = m /M
n = 60/4
n = 15
therefore number of moles in 60 g of He = 15 moles..
i hope it helps............
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2016-02-07T17:11:55+05:30
No. of moles= given mass/molar mass= 60/4 = 15
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