Limited Reactants Flashcards
1
Q
Which one is the limiting reactant?
“4.8 grams of magnesium is reacted with 7.3 grams of hydrochloric acid. Mg + 2HCl = MgCl2 + H2
Which one is the limiting reactant?”
A
Mg
Mass = 4.8g
Mr = 24
Moles = 4.8/24 = 0.2
HCl
Mass = 7.3g
Mr = (remember ignore every number) 1 + 35.5 = 36.5
Moles = 7.3/36.5 = 0.2
Since in the formula it is 2HCl then there are 2 as much moles so 0.2 x 2 = 0.4 moles of HCl reacts with 0.2 moles of Mg.
0.2 moles of Mg would need 0.4 moles of HCl. With only 0.2 moles of HCl, this is the limiting reactant.
2
Q
“The amount of product formed is ……………………………….. to the amount of limiting reactant.”
A
Directly proportional