Calculate the mass, in grams, for each of the following a) 0.25 mol H2 b) 1.10 mole Ca3(PO4)2 (save time,...

4. Calculate the mass, in grams, for each of the following
a) 0.25 mol H2
b) 1.10 mole Ca3(PO4)2 (save time, refer to 3b of this problem set)
5. In a 12-oz can of coke there are 193 mg of phosphoric acid (H3PO4). How many moles of phosphoric acid is this?
6. There are 34 mg of caffeine (C8H10O2N4) in a regular 12-oz can of coke. How many moles of caffeine is this?
7. Balance each of the following equations.
a) ____ Si3N4 (s) -> ____ Si (s) + ____ N2 (g)
b) ____ Zn (s) + ____ HNO3 (aq) -> ____ Zn(NO3)2 (aq) + ____ H2 (g)
c) ____ Co(NO3)2 (aq) + ____ Na3PO4 (aq) -> ____ Co3(PO4)2 (s) + ____ NaNO3 (aq)