Above what temperature does the following reaction become nonspontaneous? FeO(s)
ID: 835642 • Letter: A
Question
Above what temperature does the following reaction become nonspontaneous?
FeO(s) + CO(g) ? CO2(g) + Fe(s) ?H = -11.0 kJ; ?S = -17.4 J/K
632 K
298 K
191 K
This reaction is nonspontaneous at all temperatures.
This reaction is spontaneous at all temperatures.
Which of the following is TRUE?
The equivalence point is where the amount of acid equals the amount of base during any acid-base titration.
At the equivalence point, the pH is always 7.
An indicator is not pH sensitive.
A titration curve is a plot of pH vs. the [base]/[acid] ratio.
None of the above are true.
Which of the following acids is the STRONGEST? The acid is followed by its Ka value.
HF, 3.5
a.632 K
b.298 K
c.191 K
d.This reaction is nonspontaneous at all temperatures.
e.This reaction is spontaneous at all temperatures.
Explanation / Answer
1) for spontaneous reactions, deltaG < 0
and delta G = delta H - T*delta S
thus, for, spontaneous reactions; T > deltaH/deltaS = -11000/-17.4
or, T > 632.184
thus, the correct option is (a)
2) (a)The equivalence point is where the amount of acid equals the amount of base during any acid-base titration.
3) larger the Ka value , stronger is the acid
thus, the correct option is (e)