Question

Calculate the number of Potassium ions in 7.45g of KCl?​

Answer 1

Answer:

4.76x10²²x2=9.52x10²²ions

Explanation:

Formula of potassium oxide is K2O.

Molar mass of K2O =(39x2)+16=94g/mol

No.of moles of K2O=Mass in gram/Molar mass=7.45g/94g/mol=0.079mol.

1 mole of K2O contains molecules=6.022x10²³

Therefore,0.079 mole of K2O contains molecule=6.022x10²³x0.079

=0.476x10²³

=0.476x10²² molecules

since each molecule of K2O contains two potassium ions(K+),total number of potassium ion is given by 4.76x10²²x2=9.52x10²²ions.