Molarity = (numer of mole solute) / (volume of the solution)
number of mole solute = mass solute/molar mass solute
Molarity =( mass solute/molar mass solute)/ (volume of the solution)=
= ( mass solute/((molar mass solute)*(volume of the solution))
If m is a mass of the solute, M is a molar mass a solute, V is a volume of the solution (we can think as a volume of water added).
Molarity = m/(M*V)
Answer:
The answer to your question is 18 neutrons
Explanation:
Data
Number of neutrons = ?
Atomic mass = 35
Three energy levels
seven valence electrons
Process
1.- We know that this element is on the third period (3 energy levels)
2.- We also know that this element is located on group 7A (it is a halogen)
3.- From the previous information, we conclude that this element is Chlorine.
4.- Chlorine has an atomic number of 17.
5.- The number of Neutrons = Atomic mass - atomic number
= 35 - 17
= 18
4.5 x 10-4
An easy trick is to count the zeros.