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Mazyrski [523]
3 years ago
9

What percent of magnesium bromide, MgBr2, is magnesium?

Chemistry
1 answer:
Nat2105 [25]3 years ago
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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Based on their valencies, the subscripts of the ionic compounds formed will be:

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<h3>What subscripts would you most likely use if the following substances formed an ionic compound?</h3>

A. An alkali metal and a halogen.

An alkali metal and a halogen both have valencies of one.

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By exchange of valencies, the subscripts would be 1 and 2.

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2 years ago
How many moles of S are in 35.4 g of (C3H5)2S?
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