Consider the following balanced equation: A + 5B 3C + 4D Which of the following

ID: 1032398 • Letter: C

Question

Consider the following balanced equation: A + 5B 3C + 4D

Which of the following choices best answers the question, “when equal masses of A and B are reacted, which is limiting?”

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

B) If the molar mass of A is less 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 B must be limiting

Can someone explain why the answer is D.

masses are equal for both A and B

According to reaction, mol of B required is more than A

So, if molar mass of B is more than A and masses are equal,

then moles of B will be less than A but we need more mol of B than A

This will make b the limiting reagent

Answer: D

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