Help with chemistry problem?

Question

I hope someone can help me. I'm finishing a chemistry assignment and i don't know how to go about finding the answer to this question.

An experiment requires 15.0g of Cyclohexane, whose density at 25 degrees Celsius is 0.7781 g/mL. What volume of Cyclohexane should be used?

Answer 1

Density= mass / volume

Volume = mass/ density

Volume= 15 / 0.7781 = 19.27 mL  

Answer 2

Since density equals mass divided by volume and we know the mass

required and the density, we divide the mass (15.0 gm) by the

density of cyclohexane (given as 0.7781 gm per ml.) and we get

the volume required, which is 19.277 ml.

Hope this helps.