Hydrogen chloride gas and oxygen react to form water vapor and chlorine gas. What volume of water would be produced by this reaction if 7.7 cm^3 of hydrogen chloride were consumed?

Question

Answer has a unit symbol, and is rounded to the correct number of significant digits.

Answer 1

What is the balanced equation for what is taking place?

4HCl(g) + O₂(g) ===> 2H₂O(g) + 2Cl₂(g) ... balanced equation

Since all species are gases, it is important to know the temperature and pressure of the system. Neither of these variables is given in the question, so the question, as written, cannot be answered.

If we assume STP (standard temperature and pressure), then we can proceed as follow:

7.7 cm³ HCl x 2 cm³ H2O / 4 cm³ HCl = 3.85 cm³ = 3.9 cm³ (to 2 significant figures)