Chemistry: According to the following reaction, how many grams of water will be formed upon the complete reaction of 28.8 grams of oxygen gas with excess hydrochloric acid?

Question

hydrochloric acid (aq) + oxygen(g) —> water (l) + chlorine (g)

Mass= g

Answer 1

1). Balance the equation. There is necessary to determine the correct number of moles.

4HCl (excess) + O₂---> 2H₂O + 2Cl₂

2). Convert grams of oxygen gas to moles: (28.8grams O₂)(1 mole O₂) = 0.903 moles O₂

(32.0) grams)

3). From balanced equation, 2 moles of H₂O are produced for every mole of oxygen gas, so (0.903)(2)=1.81 moles of H₂O.

4) Multiply by the molar mass of water (18.02g/mole) and obtain 32.5 grams of H₂O.