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# Answer to Question #23853 in Physical Chemistry 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) --&gt; Zn*(aq)+H2
&quot;H&quot; charge is &quot;+1&quot;
&quot;Zn&quot; charge is&quot;+2&quot;
1
2013-02-08T04:21:29-0500
Ice has a density of 0.9167 g/cm&sup3; at 0 &deg;C, whereas water has a density of 0.9998 g/cm&sup3; at the same temperature
So 0.9167g of ice converted to water give a change of (0.9167 - 0.9998) cm^3 ---&gt; 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

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