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Yakvenalex [24]
3 years ago
7

A glass of water sitting in direct sunlight evaporates over time. Explain this phase change in terms of the types of heat transf

er that occur.
Chemistry
1 answer:
dybincka [34]3 years ago
5 0
This is a physical phase change it is still water it just separated and became less and less.it stays water though
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insens350 [35]

Answer:

% purity of limestone = 96.53%

Explanation:

Question (4).

Weight of impure CaCO₃ = 25.9 g

Molecular weight of CaCO₃ = 40 + 12 + 3(16)

                                              = 100 g per mole

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From the given reaction, 1 mole of CaCO₃ reacts with 1 mole or 22.4 liters of

CO₂.

∵ 22.4 liters of CO₂ was produced from CaCO3 = 100 g

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∴ 5.6 liters of CO₂ will be produced by CaCO₃ = \frac{100\times 5.6}{22.4}

                                                                              = 25 g

Therefore, % purity of CaCO₃ = \frac{\text{Weight calculated}}{{\text{Weight given}}}\times 100

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                                                 = 96.53 %

7 0
3 years ago
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