The mass of
First you want to create a chemical equation:
From this equation we can tell that this reaction is a double replacement reaction. This is because the bromide is more reactive than the hydrogen, and replaces the hydrogen on the benzene ring of the chalcone.
We a given 0.9 mol of
As the coeficients (the numbers in front of the compounds in the chemical equation) are the same, the 0.9 mol is applicable to use throughout the entire equation.
This equation can be reformed to
Bromine has a molar mass of 79.9 mol/g. But this is one atom and must be doubled to be the molar mass of
Therefore the mass of