Question 4 if 0.587 g of nickel metal reacts with 1.065 g of chlorine gas, what is the empirical formula of the nickel chloride product? ni2cl3 ni3cl2 nicl3 nicl nicl2

The answer is NiCl3.
Solution:
We can convert the masses of the elements to the number of moles using their atomic masses:
     moles of Ni = 0.587g Ni * 1mol Ni/58.6934g Ni = 0.01000 mol
     moles of Cl = 1.065g Cl * 1mol Cl/35.453g Cl = 0.030040 mol

We divide the number of moles of each element by the lowest number of moles. In this case, we divide by 0.01000:
     0.01000 mol Ni / 0.01000 = 1
     0.030040 mol Cl / 0.01000 = 3.004 ≈ 3

We can now write the empirical formula of nickel chloride using these values as the subscript for each element: NiCl3

The mass has escaped into a gas which you can not see so the law stays true.

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