calculating the enthalpy of formation of ammonia

Watch
Fa123123
Badges: 12
Rep:
?
#1
Report 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.
0
reply
charco
Badges: 17
Rep:
?
#2
Report 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
0
reply
Fa123123
Badges: 12
Rep:
?
#3
Report 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
0
reply
charco
Badges: 17
Rep:
?
#4
Report 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?
0
reply
Fa123123
Badges: 12
Rep:
?
#5
Report 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
0
reply
charco
Badges: 17
Rep:
?
#6
Report 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!
0
reply
Fa123123
Badges: 12
Rep:
?
#7
Report 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
0
reply
charco
Badges: 17
Rep:
?
#8
Report 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
0
reply
Fa123123
Badges: 12
Rep:
?
#9
Report 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
reply
charco
Badges: 17
Rep:
?
#10
Report 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?
0
reply
Fa123123
Badges: 12
Rep:
?
#11
Report 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
0
reply
charco
Badges: 17
Rep:
?
#12
Report 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.
0
reply
charco
Badges: 17
Rep:
?
#13
Report 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?
0
reply
Fa123123
Badges: 12
Rep:
?
#14
Report 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
0
reply
charco
Badges: 17
Rep:
?
#15
Report 4 weeks ago
#15
(Original post by Fa123123)
if 1=2
wouldn't it then by 3/2 = 1.5
clearly
0
reply
Fa123123
Badges: 12
Rep:
?
#16
Report Thread starter 4 weeks ago
#16
(Original post by charco)
clearly
so what would I do next
0
reply
charco
Badges: 17
Rep:
?
#17
Report 4 weeks ago
#17
(Original post by Fa123123)
so what would I do next
0
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts
Back
to top
Latest
My Feed

See more of what you like on
The Student Room

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

Personalise

Should the school day be extended to help students catch up?

Yes (45)
29.22%
No (109)
70.78%

Watched Threads

View All
Latest
My Feed

See more of what you like on
The Student Room

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

Personalise