Question

17 the density of ethyl alcohol is 0.789 g/ml. what is the weight of ethyl alcohol that exactly fills a 200.0 ml container?
a 158.0 g
b 160.0 g
c 159.0 g
d 157.0 g

Explanation:

Step1: Recall density formula

Density $
ho=\frac{m}{V}$, where $m$ is mass and $V$ is volume. We want to find $m$, so we can re - arrange the formula to $m =
ho\times V$.

Step2: Substitute given values

Given $
ho = 0.789\ g/mL$ and $V=200.0\ mL$. Then $m=0.789\ g/mL\times200.0\ mL$.

Step3: Calculate mass

$m = 0.789\times200.0\ g=157.8\ g\approx158.0\ g$

Answer:

A. 158.0 g