C3H8 + 5 O2 � 3 CO2 + 4 H2O
a) How many molecules of carbon dioxide will be produced if 20 molecules of propane react?
b) How many molecules of oxygen react with 20 molecules of propane?
c) If 100 molecules of oxygen react, how many molecules of water will be produced?
c) If 3.75 E 23 molecules of oxygen react, how many molecules of carbon dioxide will be produced?
d) How many moles of carbon dioxide will be produced if 20.0 moles of oxygen react?
e) If 8.50 moles of water is produced by this reaction, how many moles of oxygen reacted?
2. Given the hydrate, SrCl2 � 7 H2O, how many grams of it are needed to supply 2.00 grams of water vapor?
3. 2.00 grams of Na2CO3 � H2O are heated until all of the water is gone. What is the final mass of Na2CO3?
4. CaCl2 � x H2O has a mass of 40.00 grams. Its mass decreases, upon thorough heating, to 18.72 grams. What is the value of "x"?
5. The mass of an empty crucible and cover is 37.23 g. The mass of the same crucible and cover with the hydrate Al2(SO4)3�17 H2O added is 57.45 g. What should be the mass of the crucible and cover and anhydrate Al2(SO4)3 after thorough heating has driven off all of the water?
6. How many grams of NaOH and how many grams of H3PO4 are needed to make 50 g of Na3PO4 according to the equation: (Hint: remember to balance the equation first)
NaOH + H3PO4 => Na3PO4 + H2O ?