Question

a) K2CO3
B) NaHCO
Deduce the number of Molecules of the following compounds in the given
quantities.
a) 32g oxygen
b) 90g water​

Answer 1

Answer:

32g of oxygen

Moles = Mass of subtance in grams/Molecular mass

Molecular mass of oxygen = 16

Mass of a substance = 32g

Moles(n) = 32/16 = 2

n = 2 mol

2 mol of oxygen contains 6.022 x 1023 molecules.

2 mol oxygen contains 2x6.022x1023 molecules = 12.046 x 1023 molecules.

(b) 90g water

Moles = Mass of subtance in grams/Molecular mass

Molecular mass of water = 18

Mass of a substance = 90g

Moles(n) = 90/18 = 5

n = 5 mol

5 mol of oxygen contains 6.022 x 1023 molecules.

5 mol oxygen contains 5x6.022x1023 molecules = 30.115× 1023 molecules.