Posted by **Jessica** on Wednesday, March 21, 2012 at 10:17am.

Consider the equation: A + 4B=3C+3D, when equal masses of A and B are reacted, which is limiting?

My possible answers are:

A)if the molar mass of A is less than the molar mass of B, then B must be limiting.

B) If the molar mass of A is greater than the molar mass of B, then A must be limiting.

C) If the molar mass of A is greater than the molar mass of B, then B must be limiting.

D) If the molar mass of A is less than the molar mass of B, then A must be limiting.

E) neither reactant is limiting

I am pretty sure the answer is D. I understand that a limiting reactant is the reactant that runs out first and limits the amount of prodct that can form. Please help!

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