ydrofluoric acid, an aqueous solution containing dissolved hydrogen fluoride, is used to etch glass by reacting with the silica, SiO2, in the glass to produce gaseous silicon tetrafluoride and liquid water. The unbalanced equation is HF(aq)+SiO2(s)→SiF4 (g)+H2O(l) 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.

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Stoichiometry

Stoichiometry is a chemical division that evaluates the quantitative content of the chemical process with the help of the reacting molecules or products taking part in the reaction. The term “stoicheion” in “Stoichiometry”, is an old Greek term for "element" whereas “metron” means "measure".