Question

How many molecules of aspirin (Molar mass = $180\text{g/mol}$) are present in $50\text{mg}$ of the tablet?

• A. $1.673\times {10}^{20}$
• B. $1.673\times {10}^{21}$
• C. $2.373\times {10}^{20}$
• D. $3.273\times {10}^{20}$

Answer 1

The correct option is A $1.673\times {10}^{20}$

Molecules of aspirin $=\frac{50\times {10}^{-3}}{180}\times 6.023\times {10}^{23}=1.673\times {10}^{20}$