Question

Balanced equation: SiO2 + 4 HF --> SiF4 + 2H2O

Problem: How many moles of HF are needed to produce 12.5 moles of water?
A. 18.5 moles
B. 6.25 moles
C. 25 moles
D. 100 moles
HELP PLEASEE !

Answer 1

C. 25 Miles

This is because you have 12.5 moles of water and using the ratio this is 2 (molar ratio). Therefore the molar ratio for HF is 4, so 12.5 x 2 = 25 moles