Question

What is total change in entropy equal to?

A. The standard entropy squared multiplied by the temperature of the system
B. The standard entropy squared multiplied by the number of moles
C. The standard entropy multiplied by the number of moles
D. The standard entropy multiplied by the temperature of the system

Answer 1

A or D I think?

Answer 2

@abb0t

Answer 3

If I remember correctly, \(\sf dS = \frac{ dQ}{T} \), where the change in entropy must always be positive.

Answer 4

that's what I thought but that's not an option in the above answers @abb0t

Answer 5

@jdoe0001

Answer 6

@abb0t

Answer 7

@Kainui @Abhisar

Answer 8

Apparently the Standard Entropy is just another name for the molar entropy. That is, the amount of entropy change of a single mole of the substance.

So since standard entropy is the entropy per mole of substance, if you multiply it by the total number of mols of substance undergoing an entropy change, then you have the total entropy change. \[\LARGE \Delta S = \frac{\Delta S}{mols}*mols\]

Answer 9

so the answer is C? @Kainui

Answer 10

Why would you think that?

Answer 11

because isn't \[\frac{ \Delta S}{ mols }\] the standard entropy and then the \[\times mols\] make it entropy times mols? @Kainui

Answer 12

@jdoe0001 @JoannaBlackwelder

Answer 13

I think @Kainui was trying to say that
total change in entropy = standard change in entropy * moles

Answer 14

Because standard change in entropy is change in entropy per mole

Answer 15

ΔS=(ΔS/mols)∗mols
The part in parentheses is standard entropy

Answer 16

so it is C then?

Answer 17

That is what I get.