Magnesium reacts with HCl to produce MgCl2 and hydrogen gas. How many milliliters of a 1.85M HCl solution completely reacts with 4.00g of Magnesium?

Question

Hi! I solved this problem, but keep getting a different answer from the one the professor marked as correct. He never went over the problem, so I am wondering if he made a mistake, which he has done in the past, or if I am missing something. 

 

The problem is: 

 

Magnesium reacts with HCl to produce MgCl2 and hydrogen gas. How many milliliters of a 1.85M HCl solution completely reacts with 4.00g of Magnesium?

 

Mg + 2HCl = MgCl2 + H2

 

 

The answer choices are:

 

178ml

88.9ml

123ml

609ml

 

My class peers and I are getting 178ml as our answer, but the answer marked correct is 88.9ml. If someone could explain and confirm which answer is actually correct, I would really appreciate it!!

 

 

Answer 1

Hi, I have checked the calculations and you are correct. The answer is 178 ml of 1.85 M HCl will be required