Recent content by dancingdodo27

Homework Statement 5 moles of liquid argon undergoes vaporization at its normal boiling point (87.5 K) and the resulting argon gas is subsequently heated to 150 K under constant volume conditions. Calculate the change of entropy for this process. The standard enthalpy change of vaporization, ∆...

Thank you so much! That is huge help!

Hi guys, I'm Mark. I'm technically not a physicist. I'm and undergrad studying chemistry who happens to struggle with some of the physical chemistry aspects of it and come here if help is needed.

I don't really know

All I know is that they're under standard conditions so I'm assuming its isothermal and isobaric

2C2H6 +7O2→4CO2+6H2O ΔS(sys)= 1274.2-1894.9=-620.7JK-1mol-1 ΔS(surr)= -ΔH/T ΔH=-3288.8--167.6= -31121.2kJmol-1 = -3121200Jmol-1 ∴ΔS(surr)=-3121200/298= -10473.8JK-1mol-1 ΔS(uni)=ΔS(sys)+ΔS(surr) ∴-620.7+-10473.8 = -11094.5JK-1mol-1 That's what I think it is but I'm not sure

Calculate the change in entropy for the system, the surroundings and the Universe if 2 moles of ethane are completely combusted at 298 K. Standard entropies of C2H5(g), O2(g), H2O(l) and CO2(g) are 229.6, 205.1, 69.9, 213.7 J mol-1 K-1 , respectively. Standard enthalpy changes of formation of...