PLEASE SOMEONE ANSWER ASAP! A beaker is filled with 5.7 grams of Nitrogen gas in a fixed volume of 4 Liters. One of the valves opened and there remains only 3.8 grams of Nitrogen gas, what is the new volume of gas?

Agas in a balloon at constant pressure has a volume of 160 ml at -125*c. what is its volume at 29.0*c?

The mass of a neutron is equal to the mass of a proton plus the mass of an electron. true or false false true

Given the following at 25c calculate delta hf for hcn (g) at 25c. 2nh3 (g) +3o2 (g) + 2ch4 (g) > 2hcn (g) + 6h2o (g) delta h rxn= -870.8 kj. delta hf=-80.3 kj/mol for nh3 (g), -74.6 kj/mol for ch4, and -241.8 kj/mol for h2o (g)