OpenStudy (lolaismy):

Determine the entropy change when 1.80 mol of HBr(g) condenses at atmospheric pressure?

2 years ago
OpenStudy (lolaismy):

2 years ago
OpenStudy (lolaismy):

That's the question, I've seriously tried everything and I just don't know how to find the Entropy change of the solution. I don't want to loose any more points on the question and I want to understand how to solve for it. ANYONE PLEASE!

2 years ago
OpenStudy (anonymous):

Entropy Change is Del S = Del H / T.. Please try to solve by using this equation.

2 years ago
OpenStudy (lolaismy):

@nanosaravana Del H from vapourization or fusion?

2 years ago
OpenStudy (anonymous):

yes

2 years ago
OpenStudy (lolaismy):

@nanosaravana condensation is delta H fusion, not vapourization right?

2 years ago
OpenStudy (anonymous):

Yes, condensation is not vaporization. You know the Del S per mole which is tabulated. How do you calculate for 1.8 moles is the answer:

2 years ago
OpenStudy (lolaismy):

Delta S= 12.922/(melting point + 273.15 ((-86.96+273.15)) then multiply that by 1.7 for moles?

2 years ago
OpenStudy (lolaismy):

Or should I use the temperature for boiling instead of melting?

2 years ago
OpenStudy (anonymous):

Melting point can be used.

2 years ago
OpenStudy (lolaismy):

So it would be melting point temperature rather than boiling?

2 years ago
OpenStudy (anonymous):

When considered fusion, yes. It is boiling point When working on vapurization

2 years ago
OpenStudy (lolaismy):

So then if I solve down, I get an entropy change of .117798 J/K.... That looks a little low.....

2 years ago
OpenStudy (jfraser):

condensation is the same $$process$$ as vaporization, but in the opposite direction. You need to find the molar entropy of vaporization, with the opposite sign, and then multiply by 1.80 because you have 1.80 moles, rather than 1.0 moles

2 years ago
OpenStudy (lolaismy):

@JFraser THANK YOU SO MUCH I was using the wrong entropy because I thought it was fusion!! You've solved my confusion!

2 years ago
OpenStudy (jfraser):

YW

2 years ago