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Answer:
1. The greenhouse effect
2. sufficient pressure and temperature
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Mass no. = Protons + Neutrons
Mass no.= 6 + 8
= 14
If you look at the periodic table, you will see that the carbon atom has a mass number of 12. But if you compare with this carbon, it is 14. This is because this carbon atom is an isotope. The isotope is called carbon-14.
Answer: The average kinetic energy of the molecules will increase.
Explanation: We are given a container having fixed volume of 5.00L and there is an increase in the temperature of the cotainer from 20°C to 250°C.
The average kinetic energy is directly related to the temperature of the gas.
Mathematically,

From the above expression, as we increase the temperature of the gas, the average kinetic energy of the gas increases and vice-versa.
In the given question, the temperature of the gas is increasing and hence, the average kinetic energy of the molecules will also increase.