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Calculate the mass of 9.0x10^17 molecules of He gas at STP

Calculate the mass of 9.0x10^17 molecules of He gas at STP
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Calculate the mass of 9.0x10^17 molecules of He gas at STP

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User Reckface
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6,02*10^(23) \ \ \ \ \ \rightarrow \ \ \ \ 4g \ He\\ 9,0*10^(17) \ \ \ \ \ \ \rightarrow \ \ \ \ m_(x)\\\\ m_(x)=(9*10^(17)*4g)/(6,02*10^(23))\approx5,98*10^(-6)g
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User Azazul
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