What formula do I use for this Chemistry question?

Question

I'm not asking for the answer, just please help me as to what formula do I use or how exactly do I get the answer, I'm stumped.

'An object with a mass of 7.5g raises the level of water in a graduated cylinder from 25.1mL to 30.1mL. What is the density of the object?'

I know that to find density it's mass divided by volume, but how exactly do I work that into this particular problem.

I would really appreciate all the help I can get!

Answer 1

you need to find the change in mL then u can plug it in.  

Answer 2

it might help if you know that, to find volume, you should take the final volume minus the initial volume.

instead of just using d= m/v, i use d = m/(vf-vi) where vf and vi are volume final and volume initial, respectively.

so, subtract 25.1mL from 30.1mL to find your volume and divide your mass by that volume.

Answer 3

d=m/v

in this case the initial reading for H2O=25.1

and the final reading= for H2O= 30.1

so u just take the final reading minus the initial reading then u wll get the volume of water.. then use the formula....

d=7.5/30.1-25.1

Answer 4

remember that ml = cubic cm.

By subtracting the before and after, you have the volume of the object. You also have its mass.

Just plug into D = M/V