2. Phosphorus trichloride reacts with water according to thefollowing equation.

Question

2. Phosphorus trichloride reacts with water according to thefollowing equation. PCl3(l)+ 3H2O --> H3PO3(aq) + 3HCl(aq) A 2.10-g sample of PCl3(l) reacted with excess H2O(l) in acalorimeter. The temerature rose from 20.55oC to30.30oC. The heat capcity of the calorimeter andcontents is 427 J/oC. What is the enthalpy change forthe given reaction? 2. Phosphorus trichloride reacts with water according to thefollowing equation. PCl3(l)+ 3H2O --> H3PO3(aq) + 3HCl(aq) A 2.10-g sample of PCl3(l) reacted with excess H2O(l) in acalorimeter. The temerature rose from 20.55oC to30.30oC. The heat capcity of the calorimeter andcontents is 427 J/oC. What is the enthalpy change forthe given reaction?

Explanation / Answer

PCl3(l)+ 3H2O --> H3PO3(aq) + 3HCl(aq)
Enthalphy change of the reaction , H = mcdt Where m = mass of the sample = 2.1 g             c = specific heat capacity = 427 J / oC            dt = temperature change = 30.3 - 20.55 = 9.75 o C Plug the values we get , H = 2.1 * 427 * 9.75                                           =8742.825 J

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