Sulfur react with fluorine according to the equation: S (s) + F2 (g)  SF6 (g)

1. Balance the equation

2. Calculate the quantity of matter of SF6 obtained when 5g of sulfur react with fluorine

3. Deduce the mass of the obtained product

M(S) = 32 g. mol-1

; M(F)= 19 g. mol-1

Exercise 2:

The thermic decomposition of potassium chlorate (KClO3

) is a method used at laboratory to produce oxygen (O2

) and produce potassium

chloride (KCl).

1. Write the balanced equation of the reaction

2. Calculate :

3.1. The molar mass of KClO3

3.2. The number of moles of oxygen gaz produced during the decomposition of

0,5mol de KClO3

(s)

3.3. The mass of potassium chloride obtained from 30,6 g KClO3 solid

M(K)= 39 g. mol-1

; M(Cl)= 35 g. mol-1

; M(O)= 16 g. mol-1​