2. Which of the following examples best represents the concept of equilibrium? * The amount of water in a glass decreases due to evaporation.
The amount of sunlight that reaches the ground changes with the tilt and rotation of
the Earth's axis.
Global temperatures increase due to increasing amounts of CO2 gases being emitted
into the atmosphere by volcanic activity.
The incoming solar radiation from the Sun is equal to the amount of light and heat
reflected back into space.
Increasing amounts of CO2 gases trap more water vapor and heat near the surface of
the Earth

a

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

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