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The main source of the element magnesium in Australia is the ore magnesite, in which magnesium is present as magnesium carbonate (MgCO₃) - VCE - SSCE Chemistry - Question 1 - 2004 - Paper 1
Question 1
The main source of the element magnesium in Australia is the ore magnesite, in which magnesium is present as magnesium carbonate (MgCO₃). Calculate the percentage b... show full transcript
Worked Solution & Example Answer:The main source of the element magnesium in Australia is the ore magnesite, in which magnesium is present as magnesium carbonate (MgCO₃) - VCE - SSCE Chemistry - Question 1 - 2004 - Paper 1
Step 1
Calculate the percentage by mass of magnesium in magnesium carbonate
Answer
To find the percentage by mass of magnesium in magnesium carbonate (MgCO₃), we first need to determine the molar mass of MgCO₃.
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Calculate Molar Mass of MgCO₃:
- Mg: 24.31 g/mol
- C: 12.01 g/mol
- O: 16.00 g/mol × 3 = 48.00 g/mol
- Total = 24.31 + 12.01 + 48.00 = 84.32 g/mol
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Calculate Percentage by Mass of Magnesium:
% Mg = \frac{\text{Molar Mass of } Mg}{\text{Molar Mass of } MgCO_3} \times 100% % Mg = \frac{24.31}{84.32} \times 100 \approx 28.8%
Thus, the percentage by mass of magnesium in magnesium carbonate is approximately 28.8%.
Step 2
Magnesium carbonate reacts with aqueous hydrochloric acid according to the reaction
Answer
The reaction of magnesium carbonate (MgCO₃) with hydrochloric acid is an example of an acid-carbonate reaction, producing magnesium chloride, water, and carbon dioxide. This process can be studied to understand how different conditions affect the reaction rate.