Question

How many grams of calcium nitrate, Ca(NO3)2, contains 24 grams of oxygen?

Answer 1

refer to the equation above what do you to happen to the mass of the mass of the cups during this reaction? explain

Answer 2

1 mole Ca(NO3)2 (the molar mass in grams) contains how many grams of oxygen? That will be 6*16 = 96 grams. Therefore,
164 g contains 96 g oxygen.
Set up a proportion and solve for g Ca(NO3)2 needed to obtain 24 g oxygen. Post your work if you get stuck.