What percent of magnesium bromide, MgBr2, is magnesium?

1 answer:

7 0

First, we need to calculate the molar mass of the whole compound by adding the masses of each atom from the periodic table.

Mg= 24.3 g/mol
Br= 80.0 g/mol

molar mass MgBr2= 24.3 + 2 x 80.0= 184.3 g/mol

to find the percent of magnesium doing "parts over the whole"
the mass of magnesium over the total mass. then times 100 because it is a percentage value

24.3/184.3x 100= 13.2%

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In our case, the given ions are:

N⁻³ : Z = 7, e⁻ = 10
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