Explanation:
Bromine is a group 17 element and contains 7 valence electrons. And, in order to completely fill its octet it needs to gain just one electron. When it chemically combines with another substance and forms a compound with chemical formula as 
then it means charge on substance X is +2.
For example, compound formed between magnesium and bromine is magnesium bromide and its chemical formula will be 
.
Any element of group 2 can react with bromine to form a compound with chemical formula 
.
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No. of moles =mass given/mass acquired
no. of moles =564÷64=8.81
therefore no. of moles =8.81m
Answer: (3) ppm
Explanation: Concentration is defined as the amount of solute dissolved in a known amount of the solvent or a solution.
Parts per million (ppm) is used to express the concentration when a very small quantity of solute is present in a large quantity of the solution. It is defined as the mass of solute present in one milion 
parts by mass of the solution.
L/s is used to express flow rate.
J/g is used to express energy per unit mass.
kPa is used to express pressure.
