calculating the enthalpy of formation of ammonia

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Thread starter 4 weeks ago
#1
Guys I dont understand the question can someone please help me:

4. Given the data:
4NH3(g) + 3O2(g) 🡪--> 2N2(g) + 6H2O(l), ΔH = -1530kJmol-1
H2(g) + 1/2O2(g) 🡪--> H2O(l), ΔH = -288 kJmol-1
Construct an enthalpy cycle and calculate the enthalpy of formation of ammonia.
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4 weeks ago
#2
(Original post by Fa123123)
Guys I dont understand the question can someone please help me:

4. Given the data:
4NH3(g) + 3O2(g) 🡪--> 2N2(g) + 6H2O(l), ΔH = -1530kJmol-1
H2(g) + 1/2O2(g) 🡪--> H2O(l), ΔH = -288 kJmol-1
Construct an enthalpy cycle and calculate the enthalpy of formation of ammonia.
Write down the equation for the formation of ammonia.
Construct it from the equations given
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Thread starter 4 weeks ago
#3
(Original post by charco)
Write down the equation for the formation of ammonia.
Construct it from the equations given
do you mind helping me like with an example because i find it difficult to do it
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4 weeks ago
#4
(Original post by Fa123123)
do you mind helping me like with an example because i find it difficult to do it
Can you write down the equation for the formation of ammonia?
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Thread starter 4 weeks ago
#5
(Original post by charco)
can you write down the equation for the formation of ammonia?
1/2 n2 + 3 1/2 h2 --> nh3
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4 weeks ago
#6
(Original post by Fa123123)
1/2 n2 + 3 1/2 h2 --> nh3
Three and a half H2 molecules cannot be correct!
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Thread starter 4 weeks ago
#7
(Original post by charco)
Three and a half H2 molecules cannot be correct!
3 x 1/2 x 2 would be 3 so it would be balanced as I need to at one mole rather than putting a 3 there
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4 weeks ago
#8
(Original post by Fa123123)
3 x 1/2 x 2 would be 3 so it would be balanced as I need to at one mole rather than putting a 3 there
????

I have no idea what you mean ....

When you balance an equation you put one coefficient in front of each component, not a mathematical formula
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Thread starter 4 weeks ago
#9
(Original post by charco)
????

I have no idea what you mean ....

When you balance an equation you put one coefficient in front of each component, not a mathematical formula
well I've been told by my chemistry teacher i can
and as you can see from my question of of the chemical equation has a 1/2 too

but can you explain to me how i would use the other 2 equations to figure out what i need to do please
Last edited by Fa123123; 4 weeks ago
0
4 weeks ago
#10
(Original post by Fa123123)
well I've been told by my chemistry teacher i can
Well you can't!

What you can do is "think it" and then write down one number.
How many H2 molecules do you need to get three hydrogen atoms?
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Thread starter 4 weeks ago
#11
(Original post by charco)
Well you can't!

What you can do is "think it" and then write down one number.
How many H2 molecules do you need to get three hydrogen atoms?
i have no idea as thats what I've been taught could you please just explain the question
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4 weeks ago
#12
(Original post by Fa123123)
i have no idea as thats what I've been taught could you please just explain the question
If you can't balance the equation, you can't do the question.
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4 weeks ago
#13
(Original post by Fa123123)
i have no idea as thats what I've been taught could you please just explain the question
One pair of shoes contains two shoes.

How many pairs do you need to get three shoes?
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Thread starter 4 weeks ago
#14
(Original post by charco)
One pair of shoes contains two shoes.

How many pairs do you need to get three shoes?
if 1=2
wouldn't it then by 3/2 = 1.5
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4 weeks ago
#15
(Original post by Fa123123)
if 1=2
wouldn't it then by 3/2 = 1.5
clearly
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Thread starter 4 weeks ago
#16
(Original post by charco)
clearly
so what would I do next
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4 weeks ago
#17
(Original post by Fa123123)
so what would I do next
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