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Chemistry 5070 · Cambridge (CAIE) O Level
Percentage Yield
2 past-paper questions on Percentage Yield · examined 2020–2022.
20221 question
5070/21 · M/J · Q5(b)(iv) [1]Sign up to mark my answer →
A student uses 2.80 g of iron to make 12.5 g of hydrated iron(II) sulfate crystals. This is a 90% yield. Calculate the mass of hydrated iron(II) sulfate crystals made from 2.80 g of iron if the yield is 100%.
20201 question
5070/11 · M/J · Q14 [1]Sign up to mark my answer →
Ethanol can be made by the reaction shown. If 5.00 g of C2H5Br produces 1.59 g of ethanol, what is the molar percentage yield of ethanol?
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