Question

There are 6.022 x 10^23 atoms of Hg in 1 mole of Hg. The number of atoms in 4.5 moles of Hg can be found by multiplying 4.5 by 6.022 x 10^23

A. 2.7 x 10^24
B. 27 x 10^23
C. 2.71 x10^24
D. 27.099 x 10^23

Answer 1

Answer:
`27* 10^(23)`

Step-by-step explanation:

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number
`6.023* 10^(23)` of particles.

1 mole of
`Hg` contains =
`6.023* 10^(23)` atoms of mercury

Thus 4.5 moles of
`Hg` contains =
`(6.023* 10^(23))/(1)* 4.5=27.099* 10^(23)` atoms of mercury

Thus the number of atoms in 4.5 moles of mercury are
`27* 10^(23)` atoms of mercury.

Answer 2

D. 27.099 x 10²³.

Step-by-step explanation:

• It is known that every 1.0 mole of an atom contains Avogadro's no. (6.022 x 10²³) atoms.

So, 4.5 mol of Hg will contain:

(4.5 mol)(6.022 x 10²³) = 27.099 x 10²³ atoms.

So, the right choice is: D. 27.099 x 10²³.