Answer
(a)$V=3\times 10^5 cm^3$
(b)$V=25cm^3$
(c)$V=3.18cm^3$
Work Step by Step
We know that
$d=\frac{m}{V}$ Where d,m and V stand for density, mass and volume respectively
The above equation can be rearranged as
$V=\frac{m}{d}$.....eq(1)
(a)
We plug in the known values in equation (1) for Hydrogen gas to obtain:
$V=\frac{25g}{0.000084\frac{g}{cm^3}}$
$V=3\times 10^5 cm^3$
(b) We plug in the known values in equation(1) for water to obtain:
$V=\frac{25g}{0.9982\frac{g}{cm^3}}$
$V=25cm^3$
(c) We plug in the known values in equation(1) for iron to obtain:
$V=\frac{25g}{7.87\frac{g}{cm^3}}$
$V=3.18cm^3$
