Chemistry, 30.11.2021 23:10 jordanbyrd33
When 20. 0 grams of a substance is completely melted at its melting point, 820. Joules are absorbed. What is the heat of fusion of this substance?.
Answers: 2
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, 23.06.2019 01:30
Which statement justifies that hydrogen peroxide (h2o2) is a polar molecule? the o – h bond is nonpolar and the molecule is asymmetric. the o – h bond is nonpolar and the molecule is symmetric. the o – h bond is polar and the molecule is asymmetric. the o – h bond is polar and the molecule is symmetric.
Answers: 1
Chemistry, 23.06.2019 08:20
At which temperature would a reaction with ah= -220 kj/mol and as=-0.05 kj/(mol-k) be spontaneous?
Answers: 2
Chemistry, 23.06.2019 11:00
Achemist weighed out 101.g of silver. calculate the number of moles of silver she weighed out.
Answers: 2
When 20. 0 grams of a substance is completely melted at its melting point, 820. Joules are absorbed....
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