The formula is:
[tex]c = \frac{m}{v} [/tex]
Where c is the concentration, m is the mass and v is the volume.
C=32.0mg/ml, M= 240.0mg
Your going to transpose to find v from the formula:
[tex]c = \frac{m}{v} [/tex]
Multiply by v you'll get
[tex]c \times v = \frac{m}{v} \times v \\ cv = m[/tex]
Divide by c you'll get
[tex]cv = m \\ \frac{cv}{c} = \frac{m}{c} \\ v = \frac{m}{c} [/tex]
Plug in the values of m and c
[tex]v \: = \frac{m}{c} \\ v = \frac{240.0 \: mg}{32 \: mg {ml}^{ - 1} } [/tex]
V =7.5 mL
