how can cool red giant be more luminous than a warmer main sequence star?

a) it is not possible for a cool red giant to be more luminous than a warmer main sequence star.

b) the red giant will be more luminous if it is smaller than the main sequence star.

c) the red giant will be more luminous if it is bigger than the main sequence star.

d) cool red giants are always more luminous than a warmer main sequence star because they give off more energy.

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