Question

. In Avogadro number is changed from $6.022 \times {10^{23}}mo{l^{ - 1}}$ to $6.022 \times {10^{22}}mo{l^{ - 1}}$, 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 the unit of grams
D.The mass of one mole of carbon

Answer 1

One mole of a substance is equal to $6.022 \times {10^{23}}$ units of the substance (such as atoms, molecules, or ions). The number $6.022 \times {10^{23}}$ is referred to as Avogadro's number or Avogadro's constant. The concept of the mole can be used to calculate the mass of a given number of entities.

Complete step by step answer:
The mole (mol) is the SI unit of quantity of a “chemical entity”, such as atoms, electrons, or protons. It is defined as the amount of a substance that contains as many particles as there are atoms in 12 grams of pure carbon-12. So, 1 mol contains $6.022 \times {10^{23}}$ elementary entities of the substance.
Change in the value of Avogadro number will directly change the number of atoms of carbon in one mole. If the number of atoms in one mole is changed, then the mass of one mole will also change.

Thus, the correct answer is option (D).

Additional information:
Amadeo Avogadro was the person who first proposed that the volume of a gas at a given pressure and temperature is proportional to the number of atoms or molecules, regardless of the type of gas. He did not determine the exact proportion, yet he is credited for the idea.

Note:
Change of Avogadro number would change the molar mass of the substance since the molar mass is the mass of one mole $6.022 \times {10^{23}}$ of a substance.