Answer: The temperature is there to confuse you on purpose. Density changes with temp, but in these type of problems, they mean nothing
Explanation:
The formula for density is mass per unit of volume.
[tex]D=m/v[/tex]
We dont have to do any conversions here so it boils down to division and multiplication.
[tex]0.785g/mL=mass/15mL\\0.785g/mL*15mL = mass\\=11.78 grams[/tex]
Now for the second part:
[tex]0.785g/mL=15g/volume\\15g/0.785g/mL = volume\\=19.11mL[/tex]
