Pcl5 => pcl3+cl2
the no of moles of cl2 produced will be if one mole of pcl5 is heated 250c in vessel having a capacity of 10dm^3. at 250°c kc= 0.041

0.47 moles

Explanation:

Initial moles of   = 1 mole

Volume of container =

Initial concentration of  

The given balanced equilibrium reaction is,

Initial conc.         0.1 M             0    0

At eqm. conc.    (0.1-x) M   (x) M   (x) M

The expression for equilibrium constant for this reaction will be,

Solving for x:

Thus concentration of produced is 0.047 M

where,

n= moles of solute  

= volume of solution in L

Thus moles of produced is 0.47.

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e