Chemistry question that I don't understand at all!! (1 Viewer)

[daisy_22]

I have tried to do these questions so many times but the quiz keeps on marking them wrong (and doesn't provide the answer or explaination) can someone please help with the answer and working out?

 

[carrotsss]

For question 3:
The kJ is given as 154.5kJ, so q = -154.5kJ (since there heat is being released from the system)
The molar mass is 5*10.81 + 11*1.008=65.138. Therefore n=(6.3)/(65.138)=9.67*10^-2

So the△H=q/n which is (-154.5)/(9.67*10^-2)=-1597.43 kJmol-1

 

[carrotsss]

For question 4 the lack of information is weird, if I had to guess when they say Keq they mean Qsp (which is dumb) and if that’s the case, then Qsp>Ksp (Ksp value from the data sheet), so there are excess products. Not too sure though.

Out of curiosity, where are you getting these questions?

 

[nsw..wollongong]

for q4, i would think that its the reactants because Keq<1, so equilibrium shifts to make more AgCl and less Ag and Cl ions.

 

[carrotsss]

for q4, i would think that its the reactants because Keq<1, so equilibrium shifts to make more AgCl and less Ag and Cl ions.

lol I overcomplicated it hard, yeah ur right but the wording “favoured” is weird

 

[nsw..wollongong]

lol I overcomplicated it hard, yeah ur right but the wording “favoured” is weird

no exactly, i had to look at it a couple of times before realising its not that bad of a q lmaooo

 

[daisy_22]

For question 4 the lack of information is weird, if I had to guess when they say Keq they mean Qsp (which is dumb) and if that’s the case, then Qsp>Ksp (Ksp value from the data sheet), so there are excess products. Not too sure though.

Out of curiosity, where are you getting these questions?

It's part of a weekly quiz