A container made from 900g iron is 28.7L in size and has 1.00atm N2 inside. Then CH4 is burned to heat the container and the final pressure is 927 torr and 335K in temp. CH4 + 2 O2 --> CO2 + 2H2O dHrxn = -890 kJ SN2 = 1.04J/gC SFe = 0.4498 J/gC All heat from burning goes into container and gas. What was the mass of CH4 in grams required?

If we compare and contrast electromagnetic waves with sound waves, all but one statement is true. that is a) sound waves require a medium to travel while electromagnetic waves do not. b) electromagnetic waves can travel through the vacuum of space while sound waves cannot. c) electromagnetic waves must have a medium in which to travel, but sound waves can travel anywhere. eliminate d) sound waves must bounce off of matter in order to travel while electromagnetic waves do not require matter to be present.

In a heat of an engine, if 700 j enters the system, and the piston does 400 j of work what is the final internal (thermal) energy of the system if the initial energy is 1,500 j

In medium-sized stars such as the sun, nuclear fusion almost always means the fusing of nuclei to form , but larger stars can produce elements as heavy as