For the following reaction, 4.51 grams of water are mixed with excess silicon tetrafluoride. The reaction yields 8.73 grams of hydrofluoric acid. SiF4 (s) + 2H2O (l) 4HF (aq) + SiO2 (s) (1) What is the theoretical yield of hydrofluoric acid?

Theoretical yield is 10.0g of HF.

Explanation:

Theoretical yield is defined as the yield of a reaction assuming a 100%.

In the reaction:

SiF₄(s) + 2H₂O(l) → 4HF(aq) + SiO₂(s)

2 moles of water produce 4 moles of HF.

4.51g of H₂O are:

4.51g ₓ (1mol/18.02g) = 0.250moles of water. Moles of HF:

0.250moles H₂O ₓ (4mol HF/2mol H₂O) = 0.500mol HF

In grams:

0.500mol HF ₓ (20.01g / 1mol) = 10.0g of HF - theoretical yield-

I hope it helps!