Question

4.In 100 mL of a solution there are 36 g. How many mg will 7.5 mL contain?

Answer 1

$\begin{gathered} If\text{ 100mL contains 36g} \\ \text{Therefore, 1mL will contain }\frac{36}{100}g=0.36g \end{gathered}$

Thus;

$7.5mL\text{ will contain 7.5}\times0.36g=2.7g$

Expressing 2.7g to milligram(mg); we have:

$\begin{gathered} 2.7g=2.7\times1000mg \\ \Rightarrow2700mg \end{gathered}$