Question

1. the density of ethanol is 0.789 g/ml at 20°c. find the mass of a sample of ethanol that has a volume of 150.0 ml at this temperature.

Explanation:

Step1: Recall density formula

The density formula is $
ho=\frac{m}{V}$, where $
ho$ is density, $m$ is mass and $V$ is volume. We can re - arrange it to solve for mass: $m =
ho\times V$.

Step2: Substitute given values

Given $
ho = 0.789\ g/mL$ and $V=150.0\ mL$. Substitute these values into the mass formula: $m=0.789\ g/mL\times150.0\ mL$.

Step3: Calculate mass

$m = 0.789\times150.0\ g=118.35\ g$.

Answer:

$118.35\ g$