The chemical reaction of hydrogen with oxygen produces water. 2 H2(g)+O2(g) ⟶2 H2 O(g) a. How ma

The chemical reaction of hydrogen with oxygen produces...

The chemical reaction of hydrogen with oxygen produces water. $$ 2 \mathrm{H}_{2}(g)+\mathrm{O}_{2}(g) \longrightarrow 2 \mathrm{H}_{2} \mathrm{O}(g) $$ a. How many moles of $\mathrm{O}_{2}$ are required to react with $2.6 \mathrm{~mol}$ of $\mathrm{H}_{2}$ ? b. How many moles of $\mathrm{H}_{2}$ are needed to react with $5.0 \mathrm{~mol}$ of $\mathrm{O}_{2}$ ? c. How many moles of $\mathrm{H}_{2} \mathrm{O}$ form when $2.5 \mathrm{~mol}$ of $\mathrm{O}_{2}$ reacts?

The chemical reaction of hydrogen with oxygen produces water.
$$
2 \mathrm{H}_{2}(g)+\mathrm{O}_{2}(g) \longrightarrow 2 \mathrm{H}_{2} \mathrm{O}(g)
$$
a. How many moles of $\mathrm{O}_{2}$ are required to react with $2.6 \mathrm{~mol}$ of $\mathrm{H}_{2}$ ?
b. How many moles of $\mathrm{H}_{2}$ are needed to react with $5.0 \mathrm{~mol}$ of $\mathrm{O}_{2}$ ?
c. How many moles of $\mathrm{H}_{2} \mathrm{O}$ form when $2.5 \mathrm{~mol}$ of $\mathrm{O}_{2}$ reacts?

Key Concepts

Mole Concept

The mole is a basic unit in chemistry that quantifies the amount of substance. It allows chemists to count entities like atoms or molecules by relating their number to a standard constant, facilitating the comparison and calculation of reactant and product amounts in a chemical reaction.

Balanced Chemical Equation

A balanced chemical equation represents the conservation of mass and atoms by showing the proper proportions of reactants and products. The coefficients in the equation indicate the mole ratios of the substances involved, which are crucial for determining the amounts required or produced in a reaction.

Stoichiometry

Stoichiometry involves the quantitative relationships between reactants and products in a chemical reaction. It uses the mole ratios from the balanced chemical equation to convert between the amounts of different substances, enabling the calculation of how much of one substance is needed to react with or produce a given amount of another.

Transcript

00:01 All right.

00:01 So this question is asking us about the reaction of hydrogen with oxygen to produce water.

00:07 And it wants us to find out how many moles of different molecules are going to be formed throughout the reaction.

00:13 So the reaction is to hydrogen gas is reacting with oxygen gas to form water.

00:32 Also in a gas form.

00:34 All right.

00:35 That is a two.

00:37 See.

00:40 So it's asking us in part a, how many moles of oxygen are required to react with 2 .6 moles of hydrogen.

00:50 So what we are given in part a is 2 .6 moles of hydrogen is what we are given.

01:03 And it wants to know how many moles of oxygen are going to be required to react with all of that.

01:08 So what we're going to need is we're going to need to find our multiple factor between hydrogen and oxygen.

01:15 Remember that if there's no coefficient, this is just assumed to be a one.

01:19 And so what we're going to do is we need to multiply this by one of our mold -a -mole factors.

01:24 And so since we are given hydrogen, we want to cancel out these moles of hydrogen as our unit.

01:30 So we want to put the hydrogen on the bottom.

01:33 So we have two moles of hydrogen corresponds to one mole of oxygen.

01:42 And we're picking oxygen because that is what the question is asking us about.

01:46 So that is our mole -to -mole factor.

01:50 And doing that, we cancel out these moles of hydrogen.

01:54 And so to solve this, we're going to do 2 .6 divided by 2, since the 2 is on the bottom.

01:59 And that would give us 1 .3 moles of oxygen needed to react with the 2 .6 moles of hydrogen.

02:12 So all we did was just take the starting mole number that they gave us, found the correct mold -to -mole factor using the information that they needed...

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