Question

How do I solve?
How many grams of a stock solution that is 85.5 percent H2SO4 by mass would be needed to make 150 grams of a 45.0 percent by mass solution? Show all of the work needed to solve this problem.
Do I use C1V1= C2V2

Answer 1

C1V1=C2V2 is used when dilution is involved so is in this case we will not use it.
you need x gram out of 150 to give a 45% mass solution so 150*45/100=67.5 grams
85.5*x/100=67.5
x represent the amount in grams of stock solution

Answer 2

there is another formula connecting mass and concentration
C1m1= C2m2
in such type of questions 'percentage' is thought of as concentration
so use it same as i told you for
C!V1=C2V2

Answer 3

And M stands for mass right?

Answer 4

@Somy

Answer 5

yes

Answer 6

Okay so 85.5*? = 45.0*150

Answer 7

yes

Answer 8

6750/85.5?

Answer 9

yup)