silver12 silver12

16-09-2016
Chemistry

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

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17-09-2016

[tex]6,02*10^{23} \ \ \ \ \ \rightarrow \ \ \ \ 4g \ He\\ 9,0*10^{17} \ \ \ \ \ \ \rightarrow \ \ \ \ m_{x}\\\\ m_{x}=\frac{9*10^{17}*4g}{6,02*10^{23}}\approx5,98*10^{-6}g[/tex]

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