Multiple Choice HELP! =) (1 Viewer)

[Dubble-u25]

I'm not quite sure how to do this :S

http://www.boardofstudies.nsw.edu.a...wer=C&courseID=15050&testQuestionID=256810828

Please help Thanks =)

 

[Dylanamali]

Hi there,

This is a little tricky - requires a few steps.
Firstly by looking at the graph you can see that at 25 degrees the concentration of oxygen is 8mg/L
Now as they want the volume of oxygen, we need to find the number of mols of oxygen and utilise the V = no. mols x SLC formula.
8mg/L = 80g/L
n = m/M = 80/32 = 2.5mols
V = 2.5 x 24.79 = 61.975 = 62.0 mL

 

[someth1ng]

8mg/L = 80g/L

What? How are those equal?