Chapter 9.3, Problem 9.4SC

ercise 9.4 Hydrofluoric acid, an aqueous solution containing dissolved hydrogen fluoride, is used to etch glass by reacting with the silica, ${\text{SiO}}_2$, in the glass to produce gaseous silicon tetra fluoride and liquid water. The unbalanced equation is

:math> HF ( a q ) + SiO 2 ( s ) → SiF 4 ( g ) + H 2 O ( l )

l type='a'>

Calculate the mass of hydrogen fluoride needed to react with 5.68 g of silica. Hint: Think carefully about this problem. What is the balanced equation for the reaction? What is given? What do you need to calculate? Sketch a map of the problem before you do the calculations.

Calculate the mass of water produced in the reaction described in part a.