Question #4d030

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Question #4d030

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Answer 1 · 2015-10-14T01:16:48

The density of the object is approximately $2.86 \frac{g}{m L}$ $2.86g/(mL)$ .

Explanation:

Density is, essentially, a measurement of mass per unit of volume. It is usually expressed in terms of grammes per millilitre - $\frac{g}{m L}$ $g/(mL)$ - or grammes per cubic centimetre - $\frac{g}{c m^{3}}$ $g/(cm^3)$ -; keeping in mind that $1 c m^{3} = 1 m L$ $1cm^3 = 1mL$ . That is a very important relation, and from that you'll be able to work out other units, if you need to. For now, let us stick with what we were given.
So, if the object has a mass of $20 g$ $20g$ and a volume of $7 m L$ $7mL$ , how many grammes are in $1 m L$ $1mL$ ? We'll call that amount $x$ $x$ .

$20 g$ $20g$ - $7 m L$ $7mL$
$x g$ $x g$ - $1 m L$ $1mL$

$x = \frac{20 \cdot 1}{7}$ $x = (20*1)/7$
$x \approx 2.86$ $x ≈ 2.86$

First time posting, hope it helps!

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