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find the density of NH3 gas at 100celsius when confined by a pressure of 1600mmHg

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PV=nRT

where n= moles= mass/molemass=mass/17

PV*17=mass*RT
mass/V=density=Pressure*17/RT

Now look up the gas constant R, watch units carefully. Temp is in kelvins. pressure in Torr, mass is in grams. Carefull with units

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