Question

Consider the equation: A+3B--->4C. If 3.0 moles of A is reacted with 6.0 moles of B, which of the following is true after the reaction is complete? Explain your answer.

a.) A is the leftover reactant b/c you only need 2 moles of A and have 3.
b) A is the leftover reactant b/c for every 1 mole of A, 4 moles of C are produced.
c) B is the leftover reactant b/c you have more moles of b than A.
d) B is the leftover reactant b/c 3 moles of B react with every 1 mole of A.
e) Neither reactant is leftover.

Answer 1

Each mole of A reacts with 3 moles of B.
So if there are 3 moles of A, 9 moles of B are required.
Thus, A will be left over. The required amount of A according to the amount of B:
6/3 = 2 moles
Thus, the first option is correct. The answer is A.