Temperature <span>is a measure of the average kinetic energy of particles, not just gas. </span>
the nucleus is an organelle containing the cell's chromosomes
Answer: D) 1.00 g
Explanation:
According to the Avogadro's law, the volume of gas is directly proportional to the number of moles of gas at same pressure and temperature. That means,

or,

where,
= initial volume of gas = 2.00 L
= final volume of gas = 3.00 L
= initial moles of gas =
= final moles of gas = ?
Now we put all the given values in this formula, we get


Mass of helium =
Thus mass of helium added = (3.00-2.00) g = 1.00 g
I'm not sure I'm sorry for that but I found this http://www.chem4kids.com/files/atom_ions.html