How many moles of HBr are present in 18. mL of a 0.400 M solution?

1 Answer
anor277
May 12, 2017

Approx. 7*mmol

Explanation:

"Molarity" is defined by the quotient,............

"Molarity"="Moles of solute"/"Volume of solution", .................

and thus the product...................

"Volume of solution"xx"molarity"="moles of solute"

And so "moles of HBr"=18xx10^-3*cancelLxx0.400*mol*cancel(L^-1)=

=7.20xx10^-3*mol, with respect to HBr.

The product is dimensionally consistent; we wanted an answer in moles, and the product gave us an answer in moles. This is good indication that we set the problem up correctly.

Related questions
See all questions in The Mole
Impact of this question
4582 views around the world
You can reuse this answer
Creative Commons License