# Question 95ad0

Jan 28, 2015

The density of ethyl alcohol is ${\text{0.904 g/cm}}^{3}$.

A substance's density is defined as mass per unit of volume. You what what volume you've got - $\text{5.00 mL}$, so all you need to do is determine what is the weight of the sample.

Notice that the weight of the flask changes after you add the ethyl alcohol; the difference between how much the flask weighs with the ethyl alcohol sample and how much it weighs empty is the mass you need.

m_("ethyl alcohol") = m_("full") - m_("empty") = "23.27 g" - "18.75 g"

m_("ethyl alcohol") = "4.520 g"

All you need to do now is divide this mass by the volume of the sample

rho_("ethyl alcohol") = ("4.520 g")/("5.00 mL") = "0.904 g/mL"#