Question

If Avogadro number $N_A$, is changed from $6.022\times {10}^{23}{\text{mol}}^{-1}$ to $6.022\times {10}^{20}{\text{mol}}^{-1}$, this would change:

• A. The ratio of elements to each other in a compound
• B. The definition of mass in units of grams
• C. The mass of one mole of carbon
• D. The ratio of chemical species to each other in a balanced equation

Answer 1

The correct option is C The mass of one mole of carbon

Mass of $1\text{mol}(6.022\times {10}^{23}\text{atoms})$ of Carbon =$12\text{g}$
If Avogadro number is changed to $6.022\times {10}^{20}\text{atoms}$.
Then mass of one mole of carbon $=\frac{12\times 6.022\times {10}^{20}}{6.022\times {10}^{23}}$
$=12\times {10}^{-3}\text{g}$