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Consider the equation 3A + B + C + D. You react 4 moles
of A with 2 moles of B. Which of the following is true?
a. The limiting reactant is the one with the higher molar mass.
b. A is the limiting reactant because you need 6 moles of A
and have 4 moles.
c. B is the limiting reactant because you have fewer moles
of B than A.
d. B is the limiting reactant because three A molecules react
with each B molecule.
e. Neither reactant is limiting.
Justify your choice. For those you did not choose, explain why
they are incorrect.
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cristisp93

Answer:

b. A is the limiting reactant because you need 6 moles of A

Explanation:

From the equation for each 3 moles of A require 1 mole of B. So for 6 moles of A there are needed 2 moles of B, but the actual number of moles of A present is 4, so A is the limiting reactant.  

A Is incorrect, because for this problem the molar mass is not a information required to determine the limiting reactant

C and D are incorrect because A is the limiting reactant

E is incorrect because we know that A is the limiting reactant

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