Agaseous sample of pure methane, ch4, is found to occupy a volume of 20.0 l at 25℃ and 1 atm pressure. what volume of o2, at the same temperature and pressure, should be just sufficient to permit complete combustion of the methane?

10.0 l
20.0 l
30.0 l
40.0 l
none of the above is correct.

The equation below shows a chemical reaction. a + b + heat —> c + d according to the law of conservation of energy, which statement is true? a. the reactants absorb heat because they have less energy than the products. b. the products release heat because they have more energy than the reactants. c. the reactants generate heat because they have more energy than the products. d. the products require heat to form because they have less energy than the reactants.