Answer
a. $m=V d$
b. Mass of the pyrite sample is $m= 6.012\; g$
Work Step by Step
a.
The given formula is
$\Rightarrow d=\frac{m}{V}$
Multiply each side by $V$.
$\Rightarrow V\cdot d=V\cdot \frac{m}{V}$
Simplify.
$\Rightarrow V d=m$ ...... (1)
b.
Substitute $5.01 \;g/cm^3$ for $d$ and $1.2\;cm^3$ for $V$ into the equation (1).
$\Rightarrow (1.2\;cm^3)(5.01 \;g/cm^3)=m$
Simplify.
$\Rightarrow 6.012\; g=m$
