cclara
Badges: 3
Rep:
?
#1
Report Thread starter 3 weeks ago
#1
Pls pls help with full detailed working

What volume of ammonia gas will be produced in the following reaction if 50 cm3 of 0.5 mol/dm3 sodium hydroxide is boiled with 50 cm3 of 0.4 mol/dm3 ammonium chloride solution?
(Note one of these is in excess)

NaOH (aq)+NH4CI (aq)–> Nacl (aq) +H2O (l) NH3(g)
0
reply
Buzzy boson
Badges: 6
Rep:
?
#2
Report 3 weeks ago
#2
Are we told anything about the conditions? are they standard 298K 100kPa?
0
reply
cclara
Badges: 3
Rep:
?
#3
Report Thread starter 3 weeks ago
#3
no.. that is the full qn.
0
reply
bj48394
Badges: 3
Rep:
?
#4
Report 3 weeks ago
#4
Name:  IMG_20190918_235021.jpg
Views: 11
Size:  53.4 KBthe rest is en route, but does this look okay?
0
reply
bj48394
Badges: 3
Rep:
?
#5
Report 3 weeks ago
#5
Nevermind that's all wrong
0
reply
anosmianAcrimony
Badges: 20
Rep:
?
#6
Report 3 weeks ago
#6
(Original post by bj48394)
Name:  IMG_20190918_235021.jpg
Views: 11
Size:  53.4 KBthe rest is en route, but does this look okay?
Be careful not to just give her the answers. We dont do that here.
0
reply
bj48394
Badges: 3
Rep:
?
#7
Report 3 weeks ago
#7
Yeah but the working explains hopefully
0
reply
anosmianAcrimony
Badges: 20
Rep:
?
#8
Report 3 weeks ago
#8
There's more NaOH there than NH4Cl, and the equation is 1:1 with respect to those reactants, so the NaOH is in excess and the NH4Cl is the limiting ingredient.

So first convert the volume of NH4Cl solution from centimetres cubed into decimetres cubed, given there are 1000 cm3 per dm3.

Then multiply the number of dm3 of NH4Cl solution by the concentration of the NH4Cl solution, which is in mol/dm3. (The dm3 and /dm3 cancel and give an amount of NH4Cl, in moles.)

The formula tells us NH4Cl is converted into NH3 in a 1:1 ratio, so we have THAT many moles of NH3. (I.e. the same number of moles of NH3 as we had NH4Cl.)

At standard conditions, a mole of gas takes up 22.4L of volume. So multiply the amount of NH3 we had by 22.4 to give the volume of NH3 in litres. If this is an awkward number to write down you may want to convert it to mL.
1
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

University open days

  • Bournemouth University
    Midwifery Open Day at Portsmouth Campus Undergraduate
    Wed, 16 Oct '19
  • Teesside University
    All faculties open Undergraduate
    Wed, 16 Oct '19
  • University of the Arts London
    London College of Fashion – Cordwainers Footwear and Bags & Accessories Undergraduate
    Wed, 16 Oct '19

How has the start of this academic year been for you?

Loving it - gonna be a great year (109)
17.99%
It's just nice to be back! (163)
26.9%
Not great so far... (217)
35.81%
I want to drop out! (117)
19.31%

Watched Threads

View All