SiO2 + 4HF → SiFe + 2H2O

write 5 possible mole ratios

Here's what I get

Explanation:

SiO₂ + 4HF ⟶ SiF₄ + 2H₂O

The molar ratios are the same as the coefficients in the balanced equation.

Some of the molar ratios are

SiO₂:HF = 1:4

SiO₂:SiF₄ = 1:1

SiO₂:H₂O = 1:2

HF:SiF₄ = 4:1

HF:H₂O = 4:2

SiF₄:H₂O = 1:2