Question

What volume is occupied by a `5.0*g` mass of ammonia that is placed in a piston and allowed to expand against a pressure of `740*mm*Hg` at a temperature of `50` `""^@C`?

Answer 1

So we conceive that in this experiment, a mass of condensed ammonia is enclosed in a piston, which is allowed to expand against a pressure of `740*mm*Hg` and a temperature of `50` `""^@C`.

Explanation:

We use the old Ideal Gas equation.....

`V=(nRT)/P=((5.0*g)/(17.03*g*mol^-1)xx0.0821*(L*atm)/(K*mol)xx323*K)/((740*mm*Hg)/(760*mm*Hg*atm^-1))`

`~=8*L`......

Do the units in the expression cancel out to give an answer in litres? If they do not, then we have made a mistake.