Q.

If Avogadro number NA, is changed from 6.022x 1023 mol- to 6.022x 1020 mol- , this would change

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a

The ratio of elements to each other in a compound

b

The ratio of chemical species to each other in a balanced equation

c

The definition of mass in units of grams

d

The mass of one mole of carbon

answer is B.

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Detailed Solution

If Avogadro number NA​ is changed from 6.022×1023mol to 6.022×1020mol, this would change the mass of one mole of carbon from 12 g to 12 mg. However, the following will remain unchanged.
(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

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If Avogadro number NA, is changed from 6.022x 1023 mol- to 6.022x 1020 mol- , this would change