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floodlife4223
08.07.2019 •
Chemistry
35g of hf was prepared by reacting 112g of caf2 with an excess of h2so4 calculate the percentage yield
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Ответ:
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%
Ответ:
Hi There the correct answer to this is They are all related by one important equation: Any electromagnetic wave's frequency multiplied by its wavelength equals the speed of light.
Hope this helps!