anonymous one year ago Ok, this might be a stupid question, but how do you calculate the density of CH4 at .98 atm and 35 degrees Celsius? I know that Density is Mass/Volume but in this case how would you find the Mass and Volume?

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1. anonymous

You don't. Assuming ideal gas, $PV=nRT \\ \\ \frac{P}{RT}=\frac{n}{V} \\ \\ \frac{P}{RT}=\frac{m}{M_rV} \\ \\ \frac{PM_r}{RT}=\rho$

2. anonymous

How did you get from PV = nRT to $\frac{ P }{ RT }= \frac{ n }{ V }$ did you first divide both sides by RT $\frac{ PV }{ RT }= n$ Then divide both sides by V $\frac{ P }{ RT }=\frac{ n }{ V }$ I don't follow though how you replaced n with m and what is $M_{r}$