Question

The Avogadro number ($N_A$), is changed from $6.022\times {10}^{23}$ $mo{l}^{-1}$ to $6.022\times {10}^{20}$ $mo{l}^{-1}$, this would change:

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

Answer 1

The correct option is D the mass of one mole of carbon

Let us consider the Avogadro number ($N_A$) is changed from $6.022\times {10}^{23}mo{l}^{-1}to6.022\times {10}^{20}mo{l}^{-1}$ this would be change the mass of one mole of carbon.

Hence,

mass of one mole of carbon $=12$ gram

or it is a mass of $6.022\times {10}^{23}$ atoms of carbon.

Therefore,

Now, the mass of $6.022\times {10}^{20}$ atoms of carbon

$=\frac{12}{6.022\times {10}^{23}}\times 6.022\times {10}^{20}$

$=0.012g$

So, the correct option is D.