A reaction produces 74.10 g Ca(OH)2 after 56.08 g CaO is added to 36.04 g H2O. How should the difference in the masses of reactants and products be explained?

CaO + H2O Ca(OH)2

A. The reaction that occurred was a nuclear change in which some matter was converted into energy.
B. Not all of the calcium oxide reacted, because it is the limiting reactant.
C. A side reaction produced gaseous CO2 that escaped from the system.
D. Some water was in excess and makes up the difference in mass.

Question

A reaction produces 74.10 g Ca(OH)2 after 56.08 g CaO is added to 36.04 g H2O. How should the difference in the masses of reactants and products be explained?

CaO + H2O  Ca(OH)2

 		A.	The reaction that occurred was a nuclear change in which some matter was converted into energy.
 		B.	Not all of the calcium oxide reacted, because it is the limiting reactant.
 		C.	A side reaction produced gaseous CO2 that escaped from the system.
 		D.	Some water was in excess and makes up the difference in mass.

vera_ewing · Answer

@JFraser B right?

jfraser · Answer

I haven't done out the stoichiometry, but B seems the only logical choice