0.103 g of zn(s) is combined with 50.0 ml hcl in a reaction vessel, the temperature changes from 22.5oc to 23.7oc. what is the δhof for the zn2+(aq). use q = cmδt, the c for liquid water (4.18 j/g oc), and the density of 1.0 g/ml to calculate the mass of hcl.

Apure solvent has a vapor pressure the vapor pressure of a solution. a. equal to b. lower than c. higher than

7. what temperature is need to just dissolve 50 g of nh4cl in 75 g of water? '

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.