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.

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.

anonymous · Answer

A, because it's a 1:3 molar ratio between A and B
here you have 3 moles of A, which means you need 9 moles of B, but you only have 6 moles
so you only need 2 moles of A to balance with 6 moles of B