1.
greatest soubility in water of a substance is the one it has the greater Ksp
Ksp 1.3x10^-7 this one is the correct
Ksp 3.5x10^-8
2.
I HAVE A DISSOLUTION OF SODIU NITRATE IN WATER THIS OCURS INSTANTANEOUSLY, TEMP WATER DECRESSES,
AH<0, AS<0, AS<0 IS THE ANSWER I CAME UP WITH
I indestand spentaneous reactions has to be <0 but im not sure about the rest..
3
and this one I canT FIGURED OUT,
Use the following thermodynamic data
Species---ΔH°(kJ/mol)------S°(J/K mol)
H2O2(l) -187.78---------+109.6
H2O(l) -285.83----------+69.91
O2(g) 0---------------+205.14
to calculate ΔS°univ for the decomposition of hydrogen peroxide at 25.0°C.
2 H2O2(l) → 2 H2O(l) + O2(g)
a.-783.8 J/K
b.-531.9 J/K
c.+494.2 J/K
d.+783.8 J/K
e.+3741 J/K
what im doing is using
ASuniv=AS sys+AS surrandings
and to find ASsurran im using
ASsurr=-AHrxn/T So
ASsurr=(2-(-285.83))/298K
=-1.9183 kJ and convert to J/K is -1918.3 J/K
then
ASsystem (2(69.91)+205.14)-(2(109.6))= 125.76
then add ASsysm+Asurra=-1793.3
what am i doing wrong?
thanks i lot for your help
ziccoh