Question

A substance has twice the number of particles as 12 grams of carbon-12. How many

moles are in the substance?
A)1.5
B)2.5
C)3.0
D)2.0

Answer 1

D)2.0

Step-by-step explanation:

Avogadro’s number represent the number of the constituent particles which are present in one mole of the substance. It is named after scientist Amedeo Avogadro and is denoted by
`N_0`.

Also, it is the number of particles in exactly 12.000 g of isotope carbon 12.

Avogadro constant:-

`N_a=6.023* 10^(23)`

Thus,

Number of particles as 12 grams of carbon-12 constitutes 1 mole

Twice the number of particles as 12 grams of carbon-12 constitutes 1*2 mole

Thus, moles in the substance = 2.0 moles