Write a balanced chemical equation for one of the following reactions from syllabus case studies based on the chemical industry:
(i) the synthesis of urea from ammonia;
(ii) the combustion of ammonia in air;
(iii) the formation of magnesium hydroxide from slaked lime and seawater. - Leaving Cert Chemistry - Question B - 2009
Question B
Write a balanced chemical equation for one of the following reactions from syllabus case studies based on the chemical industry:
(i) the synthesis of urea from ammo... show full transcript
Worked Solution & Example Answer:Write a balanced chemical equation for one of the following reactions from syllabus case studies based on the chemical industry:
(i) the synthesis of urea from ammonia;
(ii) the combustion of ammonia in air;
(iii) the formation of magnesium hydroxide from slaked lime and seawater. - Leaving Cert Chemistry - Question B - 2009
Step 1
the synthesis of urea from ammonia;
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Answer
The balanced chemical equation for the synthesis of urea from ammonia is:
2NH3+CO2→(NH2)2CO+H2O
Where:
2 moles of ammonia react with 1 mole of carbon dioxide to produce 1 mole of urea and 1 mole of water.
Step 2
the combustion of ammonia in air;
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Answer
The balanced equation for the combustion of ammonia in air is:
4NH3+3O2→2N2+6H2O
In this reaction, 4 moles of ammonia combust in the presence of 3 moles of oxygen to yield 2 moles of nitrogen and 6 moles of water.
Step 3
the formation of magnesium hydroxide from slaked lime and seawater.
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Answer
The balanced equation for the formation of magnesium hydroxide from slaked lime (calcium hydroxide) and seawater is:
Ca(OH)2+MgCl2→Mg(OH)2+CaCl2
In this reaction, calcium hydroxide reacts with magnesium chloride to form magnesium hydroxide and calcium chloride.
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