In which atmosphere layer does 80 percent of the gas in the atmosphere
reside?

The correct answer is Troposphere.

Explanation:

The troposphere is the closest atmospheric layer of the earth's surface and 80% of the total mass of the atmosphere and 99% of the water vapor are located here.

In this layer, the higher the altitude, the temperature and the steam will be lower. This steam is responsible for regulating air temperatures thanks to the absorption of energy from the sun. Here is the air we breathe and all the climatic processes of our planet.

80% of the mass of the atmosphere is located in this layer because in it the air is much denser than in the other layers.

answer: good job it's all correct !

explanation:

answer: 2×10^-2kg

explanation: density= mass per volume

vol=mass/density

converting to s.i units we have;

3÷1000kg = 0.003

1.5÷100m = 0.15

0.003/0.15 = 0.02kg