chemistry help: what was the mass of the original sample?

Question

A sample of liquid nitrogen trichloride was heated in a 2.55 L closed reaction vessel until it decomposed completely to gaseous elements. The resulting mixture exerted a pressure of 787 mmHg at 73°C.


What was the mass of the original sample?

Answer 1

Use PV=nRT
You must convert to Pa (from mmHg, or torr)
You must convert to m^3 from L
You must convert to k from C
You are solving for n (number of moles) which must be converted from molecular weight

As you can see, there are lots of conversions and I am lazy. Try these links