If two engines are given the same amount of fuel, the more efficient engine can do more work than the less efficient engine can The following questions could be asked to help make scientific or technological progress. Which of the following questions is best
asked and answered as part of a scientific investigation, not as part of technological improvements?
OA. How can a more efficient engine be built?
OB.
How can the efficiency of an existing engine be improved?
OC.
How efficient can an engine be, in theory?
OD
How can efficient engines be built more cheaply?

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