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Calculate the % of calcium carbonate in a mixture of calcium carbonate, sodium carbonate and magnesium sulfate if we obtained 1.73g of calcium carbonate and 2.34g of sodium carbonate and 1.93g of magnesium sulfate.

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Answer:

  • % of calcium carbonate = 28.8%

Explanation:

The percentage of a substance in a mixture is calculated with the formula:

  • % of substance = (mass of substance / mass of mixture) × 100

In this case we have:

  • mass of substance = mass of calcium carbonate = 1.73 g

  • mass of mixture = mass of calcium carbonate +  mass of sodium carbonate + mass of magnesium sulfate

  • mass of mixture = 1.73 g + 2.34 g + 1.93 g = 6.00 g

Now you can substitute the values in the formula for percentage:

  • % of substance = (1.73g / 6.00g) × 100 = 28.8%

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