# Question #16fd2

Sep 8, 2017

The hint you need i think is the volume conversion liters to $c {m}^{3}$

#### Explanation:

To start, there is one rule you have to know.

$1 m l = 1 c {m}^{3}$

The given is 7 liters, so we have to convert that to milliliters by multiplying it by thousand according to the metric system.
$7 L i t e r s \rightarrow 7 \cdot {10}^{3} m l = 7000 m l$

From rule above:
$1 m l = 1 c {m}^{3}$
$7 , 000 m l = 7000 c {m}^{3}$

Now that we have both volume and mass in the desired units (7000 $c {m}^{3}$ and 200 grams)

$\text{density"="mass"/"volume"="200/7000=0.02857 g/} c {m}^{3}$

Hope that this helps. :)