Answer:
0.831*6.02*10^23=5.00*10^23 atoms of Potassium
0.169*6.02*10^23=1.017*10^23 atoms of oxygen
Step-by-step explanation:
The molecular mass of potassium oxide is 94.2g/mol. the formula is K2O. So we calculate the proportion of oxygen by dividing 15.99/94.2=0.169
That means K2 equals to 1-0.169=0.831
so we multiply 0.831*(2*39.09)g/mol(mass of 2 potassium)=64.967 g of Potassium
to calculate atoms, you will multiply the proportion by 6.02*10^23
0.831*6.02*10^23=5.00*10^23 atoms of Potassium
0.169*6.02*10^23=1.017*10^23 atoms of oxygen