How many grams are in 2.38 moles of acetic acid, CH3COOH?

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 is the layer underground where all empty spaces are filled with a combination of air and water ?

How many moles of magnesium is 3.01 x10^22 atoms of magnesium?