Solid potassium fluoride decomposes into fluorine gas and solid potassium . write a balanced chemical equation for this reaction.

                2 KF ₍s₎    →    F₂ ₍g₎  +  2 K ₍s₎

Explanation:

                    Chemical Formula of Potassium Fluoride  =  KF

                    Chemical Formula of Fluorine Gas  =  F₂

                    Chemical Formula of Solid Potassium  =  K

Step 1: Write the unbalance chemical equation,

                                             KF    →    F₂  +  K

Step 2: Balance Fluorine Atoms;

As there is one fluorine atom on left hand side and two fluorine atoms on right hand site therefore, to balance them multiply KF on left hand side by 2 i.e.

                                            2 KF    →    F₂  +  K

Step 3: Balance Potassium Atoms;

As there are two potassium atoms on left hand side and one potassium atom on right hand site therefore, to balance them multiply K on right hand side by 2 i.e.

                                             2 KF    →    F₂  +  2 K

Step 4: Assign Physical states as,

                                      2 KF ₍s₎    →    F₂ ₍g₎  +  2 K ₍s₎