Do exothermic reactions obey the law of conservation of energy?

The empirical formula of a compound is ch2o and its mass is 120 amu/molecule, what is its formula?

How is the use of hydroelectric power related to the sun

How does a sample of helium at 15 degree celsius compare to a sample of helium at 215 k? a) the helium at 15 degrees celsius has a higher average kinetic energy that the sample at 215 k. b) the helium at 15 degrees celsius has lower nuclear energy that the sample at 215 k. c) the helium at 15 degrees celsius has slower- moving atoms that the sample at 215 k. d) the helium at 15 degrees celsius has smaller atoms than the sample at 215 k.