CHEMISTRY HIGH SCHOOL

35g of HF was prepared by reacting 112g of CaF2 with an excess of H2SO4 calculate the percentage yield

Answers

Answer 1
Answer:

Answer: 61%


The reaction equation should be

CaF2 + H2SO4 → 2HF + CaSO4

For every 1 molecule CaF2 used, there will be 2 molecules of HF formed. The molecular mass of CaF2 is 78/mol while the molecular mass of HF is 20g/mol. If the yield is 100%, the amount of HF formed by 112g CaF2 would be: 112g/(78g/mol) * 2 * (20g/mol)=57.43g

The percentage yield of the reaction would be: 35g/57.43g= 60.94%

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Conduction is the main method of heat flow in a metal.
a. True
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Answers

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Answers

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The atoms of a certain material can absorb red and blue light frequencies. What happens to yellow light that shines on it? It is absorbed.
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Answers

Answer: It is either reflected or transmitted.

Explanation:

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It is reflected ir transmitted depending on what the material is. The color that something appears is actually the color that it reflects or transmits and not the color that it absorbs. I hope this helps.

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Answers

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Answers

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