Please help me please all these please

Asystem containing an ideal gas at a constant pressure of 1.22×10^5 pa gains 2140 j of heat. during the process, the internal energy of the system increases by 2320 j. what is the change in volume of the gas?

This is for my 8th grade science class, i really don’t understand. can someone me? , lol.

What is the weight of a feather (mass = 0.0001 kg) that floats through earth's and the moon's atmospheres?