A 63.9 g sample of benzene, C6H6 (molar mass = 78.11 g/mol), is at 14.0 °C. If 25.00 kJ of energy flows into this sample, what phase(s) of benzene will be present, and what will the
temperature be? Benzene's melting point is 6.00 °C and its boiling point is 80.0 °C.

the answer is c i believe

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