To identify the amount of chloride ions present in 0.1 mol
of MgCl2, first know the amount of mols of Chloride. The answer is 0.2 mol
since you just need to multiply 0.1 to 2 because there are 2 chloride in the
compound. Then, multiply the mols to 6.02x10^23. The answer would be
1.204x10^23 chloride ions.
<span>The number of protons are different from the other element. Protons are what make an element that particular element, ans so that pretty much what distinguishes the atoms of one element from the atoms of another.</span>
We Know, Velocity of light = frequency * wavelength
frequency = velocity/wavelength
f = 3 * 10⁸ / 6.50 * 10⁻⁷
f = 4.61 Hertz
So, your final answer is 4.61 Hz
Hope this helps!