An experiment shows that 13.88g of Calcium choride were obtained from the combination of 5g of Ca with chlorine what is the empirical formula of the compound?

CaCl₂

Explanation:

Mass of Calcium chloride  = 13.88g

Mass of Ca = 5g

So,

Mass of chlorine  = 13.88g - 5g  = 8.88g

Now;

Empirical formula of the compound;

 The empirical formula is the simplest formula of a compound;

                                               Elements

                               Ca                                       Cl

Mass                       5                                        8.88

Number of

moles                    5/40                                  8.88/35.5

                             0.125                                   0.25

Divide by

the smallest        0.125/0.125                          0.25/0.125

                                    1                                            2

The empirical formula of the compound is CaCl₂

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

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.