Question

Calculate these volumes.

Answer 1

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Answer 2

Answer:

For a: The volume of graphite is $5.02cm^3$

For b: The volume of bromine is $13.54cm^3$

Explanation:

To calculate volume of a substance, we use the equation:

$\text{Density of substance}=\frac{\text{Mass of substance}}{\text{Volume of substance}}$      ......(1)

• For a:

Density of graphite = $2.25g/cm^3$

Mass of graphite = 11.3 g

Putting values in equation 1, we get:

$2.25g/cm^3=\frac{11.3g}{\text{Volume of graphite}}\\\\\text{Volume of graphite}=\frac{11.3g}{2.25g/cm^3}=5.02cm^3$

Hence, the volume of graphite is $5.02cm^3$

• For b:

Density of bromine = $2.928g/cm^3$

Mass of bromine = 39.657 g

Putting values in equation 1, we get:

$2.928g/cm^3=\frac{39.657g}{\text{Volume of bromine}}\\\\\text{Volume of bromine}=\frac{39.657g}{2.928g/cm^3}=13.54cm^3$

Hence, the volume of bromine is $13.54cm^3$