Solving Heat Added to Gas + Mass Density of a Gas

[physicsgirl199]

Homework Statement

0.20 g of hydrogen gas are held in a rigid container. The temperature of the gas is changed from 200 K to 320 K. How much heat is needed

2) A gas at p = 80kPa and T = 350K has a mass density of 8.65×10−2kg/m3 . find the V_rms

Homework Equations

E_thermal = 3/2nRT

2) v_rms = √(3k*T)/m

The Attempt at a Solution

tried doing this equation and got an answer of 30 which is wrong, not really sure if I am even on the right track any guidance is appreciated!


im not even sure how to start this problem, I am not sure the reason mass density is given, I am assuming to find mass but I am confused.

 

[Simon Bridge]

tried doing this equation and got an answer of 30 which is wrong, not really sure if I am even on the right track any guidance is appreciated!

... well there are no units for a start, and you did not say which equation you used or which question you are answering.

1) 0.20 g of hydrogen gas are held in a rigid container. The temperature of the gas is changed from 200 K to 320 K. How much heat is needed?

... hint: what is "specific heat"?

2) A gas at p = 80kPa and T = 350K has a mass density of 8.65×10−2kg/m3 . find the V_rms

... you'd like to use the second equation right? But you don't know the temperature or the particle mass. Can you use the pressure and the density in combination to help you find these things? Can you find another equation that relates the rms velocity with the density and pressure?