Chemistry question help

Question

When hydrochloric acid reacts with oxygen, water and chlorine are produced. The balanced equation for this reaction is:

If 2 moles of oxygen react,

The reaction consumes	moles of hydrochloric acid.
The reaction produces	moles of water and
moles of chlorine.

Answer 1

When hydrochloric acid reacts with oxygen, water and chlorine are produced. The balanced equation for this reaction is:

If 2 moles of oxygen react,

2HCl(aq)+O₂(g)-->H₂O(l)+Cl₂(g)

Looking at the coefficients:

2 mol HCl = 1 mol O2 = 1 mol H2O = 1 mol Cl2

So, the relationship is basically

2x mol HCl = x mol O2 = x mol H2O = x mol Cl2

So, since there are 2 moles of O2, then x=2, so

4 mol HCl = 2 mol O₂ = 2 mol H₂O = 2 mol Cl₂

Answer 2

Hello,

When you are working on a question like this a good first step is to identify all of the chemicals involved. Don't forget their state of matter and whether they are reactants or products.

Hydrochloric Acid: HCl, Aqueous, Reactant

Oxygen: O2, Gas, Reactant

Water: H2O, Liquid, Product

Chlorine: Cl2, Gas, Product

Remember that Oxygen and Chlorine are diatomic gasses so they have 2 atoms per molecule.

The next step is to see if you can balance the equation.

Put your Reactants on the Left Side and your Products on the Right Side.

HCl + O2 > H2O + Cl2

Then try and play with the coefficients (the numbers before the Molecules) until both sides have the exact same number of every kind of atom. This is a skill that takes a little practice and sometimes a bit of trial and error.

A HCl + B O2 > C H2O + D Cl2

In this example you need to replace ABCD with real numbers.

Now the question asks what happens when 2 moles of Oxygen are reacted.

Use the balanced equation to determine the answers to the questions in the chart.

a) How much HCl is used

b) How much H2O is made

c) How much Cl2 is made

Good Luck,

Michael