Question

Examine the following unbalanced equation.
HCl (g) + O2 Cl2 (g) + H2O (g)

Assuming that all the gases in this reaction are at STP, what number of molecules of hydrogen chloride gas are needed to completely react with oxygen to yield 50.00 mL of chlorine gas?

Answer 1

first things first, balance the reaction:

Answer 2

4HCl (g) +O2 --> 2Cl2 + 2H2O

Answer 3

JFraser is right u have to balance the reaction

Answer 4

indeed

Answer 5

Then, find the number of mole of Cl2, given that the number of mole = vol. / molar vol.
no. of mole of HCl = 2 x (number of mole of Cl2)
no. of molecules of HCl required = avogadro constant x no of mole of HCl