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Density question

  • Thread starter Nellen2222
  • Start date
  • #1
55
0

Homework Statement



The density of a solution of ferric chloride is 1.058g/cc, and it is 7.00 percent by mass. What volume of the soltion (in mL) do you need to supply 34.0g of ferric chloride?

Homework Equations



D=m/v

The Attempt at a Solution



Not sure where to begin. I dont understand the statement, " and it is 7 percent by mass". Does this mean i ned to multiply 34*0.07? then just calculate the volume by rearranging the density formula?
 

Answers and Replies

  • #2
6,054
390
It means that 100 g of the solution contains 7 g of ferric chloride.
 
  • #3
55
0
Where do I even begin on this question?
 
  • #4
6,054
390
You know the absolute mass of ferric chloride you need to supply.

You know the mass percentage of it in the solution => you know the mass of the solution containing the required amount of ferric chloride.

Can you see what happens next?
 
  • #5
55
0
muultiply mass by mass percentage?
 
  • #6
19,675
3,987
You do understand that the solution is partly water and partly ferric chloride, right?

If, as voko pointed out, 100 gm of the solution contains 7 gm of ferric chloride, how many grams of solution contain 34 grams of ferric chloride?
 

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