Calculate the quantity of heat in joules required to completely freeze 203. 5 points grams of H2O(l) at 0.°C.

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

Two things that biomedical has invented or innovated

What is calcium oxide+diphosphorus pentoxide--> calcium phosphate balanced