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Fentanyl is sometimes mixed with vitamin C powder, C6H8O6. A chemist tested a 50.00mg tablet and found that there are 1.240 x 10-4 moles of vitamin C in the tablet, and the rest is fentanyl.
a. In the 50.00mg tablet, how many mg of fentanyl are there? Show all work.

Acalorimeter is to be calibrated: 51.203 g of water at 55.2 degree c is added to a calorimeter containing 49.783 g of water at 23.5c. after stirring and waiting for the system to equilibrate, the final temperature reached is 37.6 degree c. specific heat capacity of water (s = 4.18 j/g∙degree c). calculate the calorimeter constant. (smδt)warm water = -[(smδt)cold water + (calorimeterδtcold water)]