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Mashutka [201]
2 years ago
8

What is the mass, in grams, of 122 atoms of aluminum? Round your answer to proper significant figures.

Chemistry
1 answer:
tangare [24]2 years ago
6 0

Answer:

Mass = 547.02 × 10⁻²³g

Explanation:

Given data:

Number of atoms of Al = 122 atom

Mass in gram = ?

Solution:

Avogadro number:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.  The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ atoms

122 atom/6.022 × 10²³ atoms ×  1 mol

20.26× 10⁻²³ mol

Mass in gram:

Mass = number of moles  × molar mass

Mass = 20.26× 10⁻²³ mol  × 27 g/mol

Mass = 547.02 × 10⁻²³g

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Write the correct ionic formula when given two elements that bond ionically.
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Answer:
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                                             Mⁿ⁺ + Nⁿ⁻   →  MN
where;
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           MN  =  Salt

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Example:

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Oxidation of Na;

                                      2 Na  →  2 Na⁺  +  2 e⁻
Reduction of Cl₂;

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Crystal Lattice formation is as follow,

                                  Na⁺  +  Cl⁻   →  NaCl
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n=given mass ÷molar mass

make given mass become the subject of the formula by

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n=0.473mol

given mass=??

molar mass=48

therefore,given mass=n×molar mass

=0.473×48

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mass in grams is 22.704grams

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