Vapour pressures of water above pure liquid water are 24, 529 and 760 torr respectively at 298, 363 and 373k. use these data to answer the questions
(i). change in chemical potential (in kj/mol) for the equilibrium h2o (liquid) = h2o (gas) at 298 k is
(a) 8.6 (b) – 3.8 (c) 7.87 (d) 3.72
(ii). aqueous solution of sodium chloride (χnaclz8isuvork5cyii= = 0.015) at 298 k is in equilibrium with a water vapour pressure (in torr) of
(a) 23.64 (b) 748.60
(c) 24.36 (d) negligible
(iii). average value of enthalpy of vaporization (in kj/mol) of water between 363 and 373 k is
(a) 42.50 (b) 4.080
(c) – 40.65 (d) -40.80

idk what the question is about

the answer is c.the valence of the atoms combine .

c) should be the answer.

a. the law of proportion states the combination of 2 atoms in a specific ratio to produce multiple compounds such as the given statement of question ‘1st compound contains 88.8 % cu ’ indicates 88.8 g of cu is present along with 11.2 g oxygen in 100 g of compound whereas the statement ‘2st compound contains 79.9 % cu ’ indicates 79.9 g of cu is present along with 20.1 g oxygen in 100 g of compound

1st compound contains 88.8 g cu

for cu

m = 63 g /mol

atomic % = 88.8 /63 = 1.42

for o

m = 16 g /mol

atomic % = 11.2 /16 = 0.7

b. the emperical formula of 1st compound is

cu1.4o0.7

cu2o