Who's gonna be watching the countdown tonight? ? happy new year everybody! i can't believe it's almost 2020 this year has flown !

Can someone me with these questions plz.

When 13.3 g koh is dissolved in 102.7 g of water in a coffee-cup calorimeter, the temperature rises from 21.4 °c to 31.53 °c. what is the enthalpy change per gram of koh (j/g) dissolved in the water? * take the density of water as 1.00 g/ml. * assume that the solution has a specific heat capacity of 4.18 j/g*k. enter to 1 decimal place. do not forget the appropriate sign /(+). canvas may auto-delete the (+) sign

Which of the four hypothetical substances you investigated would be most harmful to living organisms? 50 points!