Jane performed the following trials in an experiment. Trial 1: Heat 80.0 grams of water at 15.0 °C to a final temperature of 65.0 °C.
Trial 2: Heat 80.0 grams of water at 10.0 °C to a final temperature of 65.0 °C.

Which statement is true about the experiments?

The same amount of heat is absorbed in both the experiments because the mass is same.
The same amount of heat is absorbed in both the experiments because the final temperature is same.
The heat absorbed in Trial 2 is about 1,240 J greater than the heat absorbed in Trial 1.
The heat absorbed in Trial 2 is about 1,674 J greater than the heat absorbed in Trial 1.

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.)

How do you convert 4 mmol of bromobenzene to ml?

Which substance has non polar covalent bonds