Question

1. Convert 0.780 moles of CaCl2 to a number of formula units.

2. How many moles are in 9.09 x 10 22 molecules of CO2 ?
3. Find the number of moles of magnesium atoms, Mg, that are represented by 2.13 x 10 24 atoms.
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Answer 1

1. To convert moles of CaCl2 to formula units, we need to use Avogadro's number.

1 mole of CaCl2 = 6.02 x 10^23 formula units of CaCl2

0.780 moles of CaCl2 = 0.780 x 6.02 x 10^23 formula units of CaCl2

= 4.69 x 10^23 formula units of CaCl2

2. To convert molecules of CO2 to moles, we need to use Avogadro's number.

1 mole of CO2 = 6.02 x 10^23 molecules of CO2

9.09 x 10^22 molecules of CO2 = (9.09 x 10^22) / (6.02 x 10^23) moles of CO2

= 0.151 moles of CO2

3. To find the number of moles of magnesium atoms represented by 2.13 x 10^24 atoms, we need to divide the number of atoms by Avogadro's number.

1 mole of Mg = 6.02 x 10^23 atoms of Mg

2.13 x 10^24 atoms of Mg = (2.13 x 10^24) / (6.02 x 10^23) moles of Mg

= 3.54 moles of Mg