The volume of a gas is 200.0 mL at 475 K. Find its volume at STP.

Answer 1

Like your other questions, you can use a form of the combined gas law. In this case it will be

V1/T1 = V2/T2

V1 = 200.0 ml

T1 = 475

V2 = ?

T2 = 273 (this is the temperature at STP, standard temperature and pressure)

Plug in the values and solve for V2

You should memorize that STP mean 1 atm pressure and 273 K