Density question

[Nellen2222]

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 don't 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?

 

[voko]

It means that 100 g of the solution contains 7 g of ferric chloride.

 

[Nellen2222]

Where do I even begin on this question?

 

[voko]

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?

 

[Nellen2222]

muultiply mass by mass percentage?

 

[Chestermiller]

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?