Chemistry, 29.04.2021 02:10 dogsarecute278
A supply of fluorodeoxyglucose (FDG) arrives at a positron emission tomography clinic at 8 am. At 3 pm, when you arrive at the clinic to get a PET scan, the activity level of the FDG has dropped significantly because of the 110 minute half-life of the radioactive fluorine. Considering equal masses of FDG at 8 am and 3 pm, by what factor has the activity level been reduced by 3 pm
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Chemistry, 22.06.2019 03:40
Astudent is given a sample of a blue copper sulfate hydrate. he weighs the sample in a dry covered porcelain crucible and got a mass of 23.875 g for the crucible, lid, and sample. the mass of the empty crucible and lid was found earlier to be 22.652 g. he then heats the crucible to expel the water of hydration, keeping the crucible at red heat for 10 minutes with the lid slightly ajar. on colling, he finds the mass of crucible, lid, and contents to be 23.403 g. the sample was changed in the process to very light clue anhydrous cuso4. if there are again 100.0 g of hydrate, how many grams of cuso4 are in it? how many moles of cuso4? (hint: molar mass of cuso4 = 159.6 g / mole. what per cent of the hydrate is cuso4? you may convert the mass of cuso4 to moles.)
Answers: 3
Chemistry, 22.06.2019 09:30
In 2002, the rare earth elements mine in mountain pass, california was closed because
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Chemistry, 22.06.2019 22:30
What if it is did darwin used to support his theory of evolution
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A supply of fluorodeoxyglucose (FDG) arrives at a positron emission tomography clinic at 8 am. At 3...
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