How many moles of magnesium are needed to react with 0.50 mole of
A) 4.0 moles
B) 0.50 mole
C) 1.0 moles
D) 3.0 moles
E) 2.0 moles

Question

How many moles of magnesium are needed to react with  0.50  mole of 
A) 4.0 moles 
B) 0.50 mole 
C) 1.0 moles 
D) 3.0 moles 
E) 2.0 moles

Quizplus · Accepted Answer

The balanced equation for the reaction between magnesium (Mg) and hydrochloric acid (HCl) is:

Mg + 2HCl → MgCl2 + H2

From the equation, we can see that one mole of Mg reacts with two moles of HCl. Therefore, to determine how many moles of Mg are needed to react with 0.50 mole of HCl, we can use a ratio:

1 mole Mg / 2 moles HCl = x moles Mg / 0.50 moles HCl

Solving for x, we get:

x = 0.25 moles Mg

Therefore, the best choice is C), 1.0 moles, since one mole of Mg is needed to react with 0.50 mole of HCl.

How Many Moles of Magnesium Are Needed to React with