Asked by please help !

what is the molarity of a HCl solution that contains 13.0 g of HCl in 125 mL of solution?
Answer in units of M

is it 3791.944 ?
Answered by DrBob222
No, not close.
Show your work and I'll find the error.
Answered by urgent
13(36.461)=473.993

473.993/.125=3791.944
Answered by DrBob222
mol = g/molar mass
You multiplied. You should divide.
13.0/36.461 = ?
Then ?/0.125 = x
Answered by urgent
2.852
Answered by DrBob222
Some profs would not give you credit for that answer even though it is close. The correct answer is 2.85M. Why is 2.852 wrong? Because you are allowed only three significant figures (dictated by 3 in 13.0 and 3 in 125); therefore, you may have only 3 in the answer. 2.85 satisfies that and 2.852 does not for it has 4 s.f.
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