Question

calculate the formula unit mass of K2O​

Answer 1

《《《《《ANSWER》》》》》

Molar mass of K2O = 94.196 g/mol

This compound is also known as Potassium Oxide.

Convert grams K2O to moles or moles K2O to grams

Molecular weight calculation:

39.0983*2 + 15.9994

Percent composition by element

Element Symbol Atomic Mass # of Atoms Mass Percent

Oxygen O 15.9994 1 16.985%

Potassium K 39.0983 2 83.015%

Answer 2

$\huge\boxed{Answer}$

Molecular weight of KCl =39+35.5=74.5 g/mol

Thus, the number of moles in 1 kg or 1000 g of KCl =

74.5

1000

=13.4228 moles.

Number of moles of K=13.4228 moles

1 mol of K

2

O contains 2 moles of K.

Thus, number of moles of K

2

O=

2

13.4228

=6.711 moles.

Molecular weight of K

2

O =32×2+16=94 g/mol

Thus, mass of K

2

O =6.711×94=630.834 g =0.631 kg.