Amedeo Avogadro (1776-1856), an Italian physicist, contributed to the world of c

Question

Amedeo Avogadro (1776-1856), an Italian physicist, contributed to the world of chemistry in many ways. His main contribution, however, was Avogadro's hypothesis, which eventually led to Avogadro's number Avogadro's number is the number of items in one mole and has a value of Avogadro's number = 6.02 times 10^23 We can use Avogadro's number as a conversion factor tor moles and atoms, molecules, or formula units using the following ratios: 6.02 times 10^23 atoms/1 mole of atoms 6.02 times 10^23 molecules/1 mole of molecules of 6.02 times 10^23 formula units/1 mole of substance Part A Calculate the number of molecules in 2.00 moles H_2S. Part B Calculate the number of moles of Cl atoms in 3.61 times 10^24 formula units of magnesium chloride. MgCl_2

Explanation / Answer

part A)

1 mol ------------------> 6.023 x 10^23 molecules

2.00 mol -----------------> 2 x 6.023 x 10^23 molecules

2.00 mol ------------------> 1.20 x 10^24 molecules

part B)

1 mol ----------------> 6.023 x 10^23 molecules

x mol ----------------> 3.61 x 10^24 molecules

x = 5.99

moles of MgCl2 = 5.99

moles of Cl = 2 x 5.99

                   = 12.0

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