Refractory glass used for the manufacture of chemical glassware contains 18.43% potassium oxide

Refractory glass used for the manufacture of chemical glassware contains 18.43% potassium oxide, 10.98% calcium oxide, 70.59% silicon oxide (IV). write the chemical formula of this glass in the form of a compound of oxides.

Given:
xK2O * yCaO * zSiO2
ω (K2O) = 18.43%
ω (CaO) = 10.98%
ω (SiO2) = 70.59%

To find:
glass formula -?

Decision:
1) Let m (glass) = 100 g;
2) m (K2O) = ω (K2O) * m (glass) / 100% = 18.43% * 100/100% = 18.43 g;
3) n (K2O) = m / M = 18.43 / 94 = 0.196 mol;
4) m (CaO) = ω (CaO) * m (glass) / 100% = 10.98% * 100/100% = 10.98 g;
5) n (CaO) = m / M = 10.98 / 56 = 0.196 mol;
6) m (SiO2) = ω (SiO2) * m (glass) / 100% = 70.59% * 100/100% = 70.59 g;
7) n (SiO2) = m / M = 70.59 / 60 = 1.177 mol;
8) x: y: z = n (K2O): n (CaO): n (SiO2) = 0.196: 0.196: 1.177 = 1: 1: 6;
9) Glass – K2O * CaO * 6SiO2.

Answer: Glass – K2O * CaO * 6SiO2.