staerryynighht
Badges: 3
Rep:
?
#1
Report Thread starter 4 weeks ago
#1
1) The recommended limit for safe exposure to sulfur dioxide in the air is 0.000025%. What is the concentration in parts per million,ppm?a)25b)0.25c)0.025d)0 .0025
0
reply
UNKNOWN 25
Badges: 8
Rep:
?
#2
Report 4 weeks ago
#2
I have seen that question before in past paper exam.

Concentration = (0.000025 * 10^6) / 100 = 0.25
0
reply
staerryynighht
Badges: 3
Rep:
?
#3
Report Thread starter 4 weeks ago
#3
(Original post by UNKNOWN 25)
I have seen that question before in past paper exam.

Concentration = (0.000025 * 10^6) / 100 = 0.25
thank youuu so much but why did you divide by 100
0
reply
UNKNOWN 25
Badges: 8
Rep:
?
#4
Report 4 weeks ago
#4
(Original post by staerryynighht)
thank youuu so much but why did you divide by 100
Concentration is equal to mass of solute* 1 000 000/ mass of solvent.
The mass of solute is 0.000025 in 100 part of the solvent.
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

Current uni students - are you thinking of dropping out of university?

Yes, I'm seriously considering dropping out (173)
14.6%
I'm not sure (54)
4.56%
No, I'm going to stick it out for now (346)
29.2%
I have already dropped out (35)
2.95%
I'm not a current university student (577)
48.69%

Watched Threads

View All
Latest
My Feed