Answer:
1.2 mol
Explanation:
26.8L x 1mol/22.4L = 1.2 mol
Answer: 2.25
Explanation: 1:1 mole ratio seen in equation.
20 protons
20 electrons ( as much elctrons as protons because there has to be same positive and negative to have a neutral atom)
And the number of neutrons depends of the mass number but in that case, I think that it's a Calcium atom (Ca) and so there are 20 netrons.
Since protons are postive and neutrons are neutral. Then it is postive.