58 936
Assignments Done
Successfully Done
In March 2018
Your physics homework can be a real challenge, and the due date can be really close — feel free to use our assistance and get the desired result.
Be sure that math assignments completed by our experts will be error-free and done according to your instructions specified in the submitted order form.
Our experts will gladly share their knowledge and help you with programming homework. Keep up with the world’s newest programming trends.

Answer on Physical Chemistry Question for pejman

Question #23853
a sample of zinc is placed in the ice calorimeter. if 0.0657 g of zinc causes a decrease of 0.109 ml in the in the ice/water volume of the calorimeter, what is the enthalpy change, per mole of zinc, for the below reaction?

Zn+2H*(aq) --> Zn*(aq)+H2
"H" charge is "+1"
"Zn" charge is"+2"
Expert's answer
Ice has a density of 0.9167 g/cm³ at 0 °C, whereas water has a density of 0.9998 g/cm³ at the same temperature
So 0.9167g of ice converted to water give a change of (0.9167 - 0.9998) cm^3 ---> 0.0831 cm^3/ 0.9167 g ice melted
g ice melted = 0.109cm^3/(0.0831 cm^3/0.9167 g ice melted) = 0.0907 g ice melted
heat to melt ice = (0.0907 g ice melted) * (333.55J/g) = 30,237 J from reaction
J/mole Zn =30,237 J from reaction / (0.0657 g Zn/ 65.38 g/mole) = 30237 J/mole Zn

Need a fast expert's response?

Submit order

and get a quick answer at the best price

for any assignment or question with DETAILED EXPLANATIONS!


No comments. Be first!

Leave a comment

Ask Your question