AS Chemistry Empirical formula Question

Watch
tjsgnwjs
Badges: 11
Rep:
?
#1
Report Thread starter 2 years ago
#1
2.40 g of an explosive, J, contains 0.473 g of nitrogen. J also contains 33.8% carbon
and 1.41% hydrogen by mass. The remainder of J is oxygen.
What is the empirical formula of J?

A C4HNO2
B CH2N2O
C C2HNO2
D CHNO
The answer is C
I calculated the mass of carbon, hydrogen and oxygen, then divided those by the MR individually, but ended up getting the ratio below
C : H : N : O = 2: 1: 3.2: 2
0
reply
charco
Badges: 18
Rep:
?
#2
Report 2 years ago
#2
(Original post by tjsgnwjs)
2.40 g of an explosive, J, contains 0.473 g of nitrogen. J also contains 33.8% carbon
and 1.41% hydrogen by mass. The remainder of J is oxygen.
What is the empirical formula of J?

A C4HNO2
B CH2N2O
C C2HNO2
D CHNO
The answer is C
I calculated the mass of carbon, hydrogen and oxygen, then divided those by the MR individually, but ended up getting the ratio below
C : H : N : O = 2: 1: 3.2: 2
mol ratio
N: 0.033
C: 0.067
H: 0.033
O: 0.067

You've made a mistake somewhere in your working. Post it and we'll find it.
1
reply
tjsgnwjs
Badges: 11
Rep:
?
#3
Report Thread starter 2 years ago
#3
Could you please explain to me how did you work that out?
(Original post by charco)
mol ratio
N: 0.033
C: 0.067
H: 0.033
O: 0.067

You've made a mistake somewhere in your working. Post it and we'll find it.
0
reply
charco
Badges: 18
Rep:
?
#4
Report 2 years ago
#4
(Original post by tjsgnwjs)
Could you please explain to me how did you work that out?
You've made a mistake somewhere in your working. Post it and we'll find it.
0
reply
Jeje2006
Badges: 1
Rep:
?
#5
Report 6 months ago
#5
What is MR and can you please explain in detail
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

Have you made your mind up on your five uni choices?

Yes, and I've sent off my application! (297)
57.45%
I've made my choices but havent sent my application yet (72)
13.93%
I've got a good idea about the choices I want to make (58)
11.22%
I'm researching but still not sure which universities I want to apply to (44)
8.51%
I haven't started researching yet (26)
5.03%
Something else (let us know in the thread!) (20)
3.87%

Watched Threads

View All