2. Calculate the heat energy needed to raise the temperature of 30 grams of ice from -15 °C to 59°C. Represent graphically showing low temperature,
high temperature, melting and boiling points, and be sure to label both X and Y axis.

Cp (J/g°C)
Ice 2.06
Liquid 4.18
Steam 2.02

Hifus = 334 J/g
Hvap = 2260 J/g
MP 0°C
BP 100°C

Consider this initial-rate data at a certain temperature for the reaction described by

The bond energy for the van der waals bond between two helium atoms is 7.9×10−4ev. assuming that the average kinetic energy of a helium atom is (3/2)kbt, at what temperature is the average kinetic energy equal to the bond energy between two helium atoms

Answer asap need by wednesday morning explain how a buffer works, using an ethanoic acid/sodium ethanoate system including how the system resists changes in ph upon addition of a small amount of base and upon addition of a small amount of acid respectively. include the following calculations in your i. calculate the ph of a solution made by mixing 25cm3 0.1m ch3cooh and 40cm3 0.1m ch3coo-na+. [ka = 1.74 x 10-5 m] ii. calculate the ph following the addition of a 10cm3 portion of 0.08 m naoh to 500cm3 of this buffer solution. iii. calculate the ph following the addition of a 10cm3 portion of 0.08 m hcl to 200cm3 of the original buffer solution.