Question

Calculate:
(a) The mass of 1.0505 x 1023 molecules of carbon dioxide (CO2).
(b) The number of molecules of 0.25 moles of NH3 ,
(c) The formula unit mass of Na2SO3 .
(Atomic mass: Na = 23 u, S = 32 u, O = 16 u, H = 1 u, NA = 6.022 x 1023 mol -1] =​

Answer 1

Answer:

search-icon-image

Question

Bookmark

Calculate the mass of 1.0505×10

23

molecules of carbon dioxide (CO

2

).

Easy

Solution

verified

Verified by Toppr

1mole=6.022×10

23

(N

a

=Avogadro

′

snumber)

Thenumberofmoles=

Avogadro

′

snumber

Givennumberofmolecules

Numberofmoles=

6.022×10

23

1.0505×10

23

Number of moles =0.17

Now, to calculate mass, apply the formula:

Numberofmoles(n)=

Molarmass(M)

Mass(m)

We can write:

Mass (m) = Number of moles (n) × Molar mass of CO

2

(M)

Mass=0.17mol×44g/mol

Mass=7.48g

Thus, the mass of 1.0505×10

23

molecule of CO

2

is 7.48g.

Was this answer helpful?