Please calculate the amount of energy it will take to change 20.0 grams of Water from -3oC all the way to vapor (100oC) at sea level. Show all your work for credit.
1. heat of fusion of water = 334 J/g
2. heat of vaporization of water = 2257 J/g
3. specific heat of ice = 2.09 J/g·°C
4. specific heat of water = 4.18 J/g·°C

Iwll give extra points to who gets this for ! what type of reaction is this? ?

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.)

Enzymes affect the reactions in living cells by changing the