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Average atomic mass of magnesium is 2...

Average atomic mass of magnesium is 24.31 amu. This magnesium is composed of 79 mole ` %` of `.^(24)Mg` and remaining 21 mol `%` of `.^(25)Mg` and `.^(26)Mg`. Calculate mole `%` of `.^(26)Mg`.

A

5

B

20

C

10

D

15

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The correct Answer is:
C
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Average atomic mass of magnesium is 24.31amu. This magnesium is composed of 79 mole % of 24 Mg and remaining 21 mole % of 25Mg and 26 Mg. Calculate mole % of 26 Mg.

In a periodic table, the average atomic mass of magnesium is given as 24.312 u . The average value is based on their relative natural abundance on earth. The three isotopes and their masses are ._12Mg^(24) (23.98504u) , ._(12)Mg^(25) (24.98584) and ._12Mg^(26) (25.98259 u) . The natural abundance of ._12Mg^(24) is 78.99% by mass. Calculate the abundances of the other two isotopes.

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Calculate the mass of Mg (atomic mass = 24 g'mol) that combines with 1.5 mol of O_2 to form magnesium oxide (MgO)

Metallic magensium has a hexagoanl close-packed structure and a density of 1.74 g //cm^(3) . Assume magnesium atoms to be sphere of radius r. 74.1 % of the space is occupied by atoms. Calculate the volume of each atom and the atomic radius r.(Mg = 24.31)

Magnesium and Titanium form a crystalline oxide in which Mg appears at the eight corners , oxygen appears at face centres and titanium appears at the centre of cube. The atomic mass of magnesium , titanium and oxygen is 24, 45.9 and 16 amu respectively. A similar compound is formed by calcium with titanium and oxygen . What would be the formula of substance (oxide) ?

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