Question
If 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 definition of mass in units of grams
B.
the mass of one mole of carbon
C.
the ratio of chemical species to each other in a balanced equation
D.
the ratio of elements to each other in a compound
Answer :
the mass of one mole of carbon
Solution :
If 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 the mass of one mole of carbon.
$$\because \,\,1\,mole$$ of carbon has mass = 12 $$g$$
or $$6.022 \times {10^{23}}$$ atoms of carbon have mass = 12 $$g$$
∴ $$6.022 \times {10^{20}}$$ atoms of carbon have mass
$$\eqalign{
& = \frac{{12}}{{6.022 \times {{10}^{23}}}} \times 6.022 \times {10^{20}} \cr
& = 0.012g \cr} $$