Answer:
The mass of the bar = 199.87 grams
Explanation:
Given:
Density of a brass bar = 9.87 
Volume of bar = 20.25 
To find the mass of the brass bar.
Solution:
Density of a body is defined as mass of the body per unit volume of the body.
Thus, we have:

where:
<em />
<em> density of the body</em>
<em />
<em> mass of the body</em>
<em />
<em> Volume of the body</em>
Plugging in the given values.

Solving for 
Multiplying both sides by 20.25
.


∴ 
Thus, the mass of the bar = 199.87 grams