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6 g x
Mm ( SiO₂) = 60 g / mol
Mm ( HF) = 20 g / mol
60 g ------------ 4 *20 g
6 g ----------------- x
x = 80 * 6 / : 60 = 8 g
m = 8g
v = ?
d= 1,5 g / cm³
50%x = 8/ : 0,5
x = 16
d = m / v
m = dv/ : d
v = m : d
v = 16 : 1,5 g / cm ³
v = 10, 7 cm ³
Pozdrawiam :D