Interpretation:
The method to determine the mass of liquid bromine required to react completely with given amount (in grams) of magnesium should be explained.
Concept introduction:
The ratio of mass of substance to its molar mass is said to be number of moles of that substance.
The ratio of amount of any two compounds involved in a

Explanation of Solution
In order to determine the mass of liquid bromine,
- The balanced chemical equation is written for the reaction of bromine with magnesium. The coefficients from the balanced reaction is used to calculate the mole ratio of bromine and magnesium.
- The given mass of magnesium is divided by the molar mass of magnesium to calculate the number of moles of magnesium.
- The calculated number of moles of magnesium are used to calculate the number of moles of liquid bromine using the mole ratio determined from the balanced equation.
- Now, the obtained number of moles of liquid bromine are multiplied by the molar mass of bromine to convert moles of bromine to grams, the mass of liquid bromine.
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