# Help with bond enthalpy question a level

Watch
Announcements
#1
The question is "write an equation for the formation of one mole of ammonia NH3 from its elements.

I don't get how to do this, I've seen the answer but i don't understand it. Please someone explain.
0
1 year ago
#2
(Original post by stef.o)
The question is "write an equation for the formation of one mole of ammonia NH3 from its elements.

I don't get how to do this, I've seen the answer but i don't understand it. Please someone explain.
Do you know what the formulae are for each of the elements that react together to make ammonia?

Do you know the law of conservation of matter?
0
#3
I know the formulae for each element

Not really sure about law of conservation of matter
0
1 year ago
#4
(Original post by stef.o)
I know the formulae for each element

Not really sure about law of conservation of matter
The law of conservation of matter tells us that nothing can be created nor destroyed.

So, whatever you start with in a chemical reaction you MUST end up with.

This means that chemical equations have to be BALANCED in terms of reacting atoms and product atoms.

Write down the formula of the reacting elements and the formula of the product.

Reactants --> Product

Now add numbers (multipliers) called coefficients in front of each substance to ensure that the chemical equation is balanced, i..e there are the same number of atoms on either side of the arrow.

Check out this video:

0
#5
(Original post by charco)
The law of conservation of matter tells us that nothing can be created nor destroyed.

So, whatever you start with in a chemical reaction you MUST end up with.

This means that chemical equations have to be BALANCED in terms of reacting atoms and product atoms.

Write down the formula of the reacting elements and the formula of the product.

Reactants --> Product

Now add numbers (multipliers) called coefficients in front of each substance to ensure that the chemical equation is balanced, i..e there are the same number of atoms on either side of the arrow.

Check out this video:

Thank you
0
X

new posts
Back
to top
Latest
My Feed

### Oops, nobody has postedin the last few hours.

Why not re-start the conversation?

see more

### See more of what you like onThe Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

### Poll

Join the discussion

Yes (96)
27.51%
No (253)
72.49%