I am super confused with these chemistry questions (1 Viewer)

[sunshine_c22]

Hi, I have tried solving them, but the quiz keeps on saying they are incorrect, with no answers or explanation provided, could someone please provide me with the answer and explanation?

 

[carrotsss]

Question 6:
You’re supposed to construct a rice table but I don’t really have the space for that so basically, we’re losing 0.2mol of A so we must also lose 0.2mol of B because it’s a 1:1 ratio, so [Bee]=3.3M. Then A:C is a 1:2 ratio so [C] must be 0.4M. Therefore, K=[C]^2/[Bee][A]=0.16/0.8*3.2=6.25*10^-2

 

[carrotsss]

Question 7 (I’m a bit rusty on this so may be wrong):
In order for everything to cancel out, we firstly need to make sure all the products are present when the reactions are added, which means we need to triple reaction 2 in order for it to match 3H2O. Then, we need the reactants to match the equation which means we need to reverse the first one, since B2H6 is on the LHS in the intended equation. So, adding the negative of the first enthalpy, triple the second enthalpy and then the third enthalpy, we get:
-(35.75) + 3(-286) + (-1274) = -2167 kJmol

Someone else can help with the rest I’m tired