What mass of carbon dioxide will be produced when 10.6 g of butane (C4H10) burns in an excess of oxygen forming CO2 and H2O

For which one of the following reactions is the value of δh° rxn equal to δh° f for the product? a. 2 h2 (g) + o2 (g) → 2 h2o (l) b. n2 (g) + o2 (g) → 2 no (g) c. 2 h2 (g) + o2 (g) → 2 h2o (g) d. h2o (l) + 1/2 o2 (g) → h2o2 (l) e. none of the above

Which of these expressions are correct variations of the combined gas law? p1v1t2 = p2v2t1 both

The fact that the total amount of energy in a system remains constant is a(n)