Question

calculate the percentage change in mavg of the mixture if pcl5 undergo 50% decomposition in a closed vessel.plc5-> pcl3 +cl2

Answer 1

PCl5 =  PCl3 +Cl2

Molar mass of PCl5 = 31+35.5x5 = 208.5g/mol

Molar mass of Cl2 = 35.5 x 2 = 71


Change in mass will be due to Cl2 gas given off


Percentage change in mass = Mass of Cl2/Mass of PCl5 x 100



Percentage change in mass = 71/208.5 x 100

                                              = 34%

Answer 2

Answer:

Explanation:

PCl5 = PCl3 +Cl2

Molar mass of PCl5 = 31+35.5x5 = 208.5g/mol

Molar mass of Cl2 = 35.5 x 2 = 71

Change in mass will be due to Cl2 gas given off

Percentage change in mass = Mass of Cl2/Mass of PCl5 x 100

Percentage change in mass = 71/208.5 x 100

= 34%