At constant pressure, 100j heat energy has been delivered to 8 gm of oxygen. what is the change of internal energy? how much work has been done by the gas? (moler heat capacity of oxygen at constant pressure, cp=29.1 j. mol-1.k-1. r=8.314 j. mol-1.k-1.)
can't solve that there any information missing? : / in advance.

Abeverage can is made of 3004-h19 aluminum alloy (elastic modulus 69 gpa, tensile yield strength 285 mpa, density 2.72 g/cm^3). the dimensions on the can are approximated as a thin-walled cylinder with a height of 4.83 inches, diameter of 2.60 inches. empty the can has a mass of 14.2 g. determine: a. the wall thickness of the cylinder b. assuming a pinned-pinned condition what is the critical load? c. assuming a fixed-fixed condition what is the critical load?