Directions: Show all of your work for each of the following problems. 1. What is the % Mg in MgO?

2. What is the % H in Ca(C2H3O2)2?

3. What is the % Ba in Ba(NO3)2?

4. What is the % of each element in Ni3(PO4)2?

5. What is the % of each element in Al2(CrO4)3?

6. What is the % of each element in (NH4)2(SO4)?

What is the mass of 2.00 l of an intravenous glucose solution with a density of 1.15 g/ml?

The rate constant for the reaction below is 6.2 x 10−5 mol l−1 s −1. if the initial concentration of a is 0.0500 m, what is its concentration after 115 s?

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.