Chemistry HELP NEEDED, 2009 multi choice q 15 (1 Viewer)

[wplawless]

yeah, if someone could explain the 2009 q 15 multichoice to me that'd be great... I keep ending up with (b) instead of (a)... cheers

 

[enigma_1]

From the graph at 25deg Celsius 8mg/L is the concentration.
at 10L --> 80mg of O2 is dissolved
at 10L --> 0.08g of O2 is dissolved
n(O2) = 0.08/16+16 = 0.0025
V = moles x 24.79 (because it's at 25 degress celcius)
V = 0.0025 x 24.79 = 0.0619L = 62ml :. a

 

[wplawless]

yeah kk i definitely derped on that one, cheers for the explanation

 

[enigma_1]

yeah kk i definitely derped on that one, cheers for the explanation

ahah nws all good

 

[faisalabdul16]

From the graph at 25deg Celsius 8mg/L is the concentration.
at 10L --> 80mg of O2 is dissolved
at 10L --> 0.08g of O2 is dissolved
n(O2) = 0.08/16+16 = 0.0025
V = moles x 24.79 (because it's at 25 degress celcius)
V = 0.0025 x 24.79 = 0.0619L = 62ml :. a

Exactly how i did it