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ioda
3 years ago
9

How much MgO is made when 12Kg of Mg is completely burned in air?

Chemistry
1 answer:
Flauer [41]3 years ago
8 0

Answer:

Mass = 20,000 g  

Explanation:

Given data:

Mass of MgO formed = ?

Mass of Mg react = 12 Kg (12 Kg × 1000/1 Kg = 12000 g)

Solution:

Chemical equation:

2Mg + O₂     →   2MgO

Number of moles of Mg:

Number of moles = mass/molar mass

Number of moles = 12000 g/ 24 g/mol

Number of moles = 500 mol

Now we will compare the moles of Mg and MgO.

             Mg          :           MgO

             2             :           2

            500         :          500

Mass of MgO:

Mass = number of moles × molar mass

Mass = 500 mol × 40 g/mol

Mass = 20,000 g  

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Answer:

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The equation of the reaction;

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Since the reaction is in a mole ratio of 1:1, 0.36 moles of K2SO4 is produced.

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Since the reaction is 1:1, 0.45 moles of K2SO4 is produced

Hence K2SO4 is the limiting reactant.

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Amount of excess KOH = 0.45 moles - 0.36 moles = 0.09 moles

Mass of excess KOH = 0.09 moles * 56.1056 g/mol  = 5 g of excess KOH

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3 years ago
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