The earth is made up of?
1 answer:
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Mass of Oxygen: 0.0159 grams
Moles of Oxygen: 9.94x10^-4
To find the mass of oxygen, subtract the mass of copper from the total mass.
There are 0.0159 grams of Oxygen.
To find how many moles there are, divide the given amount of oxygen by the molar mass (atomic mass) of oxygen because that mass is the same as one mole of oxygen.
Molar mass of Oxygen: 16.00
There are 9.94*10^-4 moles of Oxygen.
Solution :
It is given that :
The formula of the compound =
And that 4.70 g of the sample contains mol of Br.
It means that :
1 mol of contains = 3 mol of Br
∴ 3 mol of contain in 1 mol of
mol of
contains
mol of
Thus the mol of =
mol
The given mass is = 4.700 g
Therefore, the of
= 298.4 g/mol
So of
=
of X + 3 x
of Br
298.4 g/mol = of X + 3 x 79.90 g/mol
298.4 g/mol = of X + 239.7 g/mol
of X = 58.71 g/mol (since 1 amu = 1 g/mol)
Therefore the atomic mass of the unknown metal = 58.71 g/mol
So the unknown meta is Nickel.