Question

A sample of neon gas is held in a rigid 2.284L container with a pressure of 1.036 atm at 24.3°C. 4.093g of an unknown cold gas is added to the container. The temperature drops to 20.3°C, but the pressure rises to 1.960atm. What is the molar mass of the added gas?

Answer 1

i came up with a MM of 42.2 but i do not feel that it is the correct answer how would i solve this problem

Answer 2

i figured it out 11.5 g