Find Molecularity Of H2+1/2o2=h2o​

jpal94238 jpal94238

• 27.08.2020
• Chemistry
• Secondary School

answered • expert verified Find molecularity of h2+1/2o2=h2o​ See answers pinkypearl301 pinkypearl301

Answer:

3

Explanation:

Given: → H2O

To find the molecularity we need to take the sum of the reactants. The reactants should be in whole number as molecularity cannot be a fraction or a negative number or decimal. Therefore multiply the equation by 2 and we get 2H2+O2 gives 2H2O. Calculating the Stoichiometric coefficient we get 2+1 and therefore the molecularity of the reaction is 3.

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Andrew32 Andrew32

Answer:

H2 + 1/2O2 → H2O

This compound is Water. Water is formed from two elements, Hydrogen and Oxygen, and to get the compound, like many others, you need specific quantities of each element to get the specific product. That is the basis of Balancing Chemical Equations in Chemistry. It is essentially a way of knowing that you are getting the correct product, because this is the way you would put it together in the lab if you were conducting an experiment to generate water from Oxygen and Hydrogen. Think of it as baking a cake, for example. You need to have specific ingredients in specific quantities, or else you end up with a funny-looking or funny-tasting cake.

In the case of water, as you can see from the formula H2O, we need two molecules of hydrogen and one of oxygen to form the compound. That is what we would do in the lab. let’s say you had no idea of what to do. All you knew was that you need two Hydrogen and 1 Oxygen molecules to give water. The other thing to understand is that to have a hydrogen and oxygen MOLECULE, you need two ATOMS of both (that’s not applicable to all atoms, but for these two it is). So: the raw equation for this reaction will be

H2 + O2 → H2O

If you look at this, you would see that there is one more oxygen on the left side. So we need to Balance the equation. What can we do on the left side that would make it equal to the right? If we divide the Oxygen molecule on the left by two, we get 1 Oxygen atom. Dividing by 2 also means multiplying by half (1/2), so we get

H2 + 1/2O2 → H2O

Now you see our equation is balanced and happy water molecules would begin to form. This essentially means we need 1 molecule of Hydrogen (so 2 Hydrogen ATOMS), and half a molecule of Oxygen (so 1 Oxygen Atom, which is why we had to divide the O2 by 2), to give 1 molecule of Water, H2O.

But no one really likes fractions, right? So another way to do this would be:

What happens if we multiplied the half by 2? We get 1 right? So a better-looking equation would be

2 x (H2 + 1/2O2 → H2O)

This becomes:

2H2 + O2 → 2H2O

Meaning that we could use 2 Molecules of Hydrogen and 1 Molecule of Oxygen to give 2 Molecules of Water. And what this all means is whatever the quantity of Oxygen you have, you need 2 times the quantity of Hydrogen, and this would give you 2 times the quantity of Water.

Hope this helped!

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