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Are the molecules in a gas in constant motion?
Yes, the molecules of a gas are constantly in a random motion if the gas temperature is more than 0 degree kelvin. This random motion determines the average kinetic energy of the molecules which is equal to the temperature of the gas. I hope this answers your question.
What is the most appropriate to express number of molecules per volume?
Avogadro's number is the number of molecules in a mole of a substance. This is expressed as 6.022 141 29 E23 /mol. This is defined as the number of atoms in 12 grams of carbon12. A mole of any gas has this number of molecules. Any fraction of that mole must be divided into the number.
Four states of matter?
the four states of matter are a solid, liquid ,gas, and plasma the molecules in a solid are tightly packed together in a liquid they take the shape of its container a gas the molecules move freely and in plasma the molecules attract each other positive and negative
Gas particles travel at speeds of up to 500 meters per second then why does it take so long for gas molecules to travel the length of a room?
Because gas molecules continually collide with others. The result is a random path (known mathematically as a drunkard's walk) which results in a very long time to cover a significant distance.
When can volume fraction be equal to mole fraction?
The volume fraction of a substance is equal to the mole fraction for ideal gas mixture
