1. What would you multiply \"atoms of Bromine\" by to get the units \"moles of B

Question

1. What would you multiply "atoms of Bromine" by to get the units "moles of Bromine"?

moles Br ×

   = atoms Br

(number)

(unit)

(number)

(unit)

2. What would you multiply "atoms of cobalt" by to get the units "moles of cobalt"?

atoms Co ×

   = moles Co

(number)

(unit)

(number)

(unit)

3. How many moles of Ca are there in a sample of Ca that contains 2.02×1024atoms?

4. How many F atoms are there in 2.97moles of F?

5. How many moles of Ca are there in 43.9grams of Ca?

6. How many grams of F are there in 2.97moles of F?

moles Br ×

   = atoms Br

(number)

(unit)

(number)

(unit)

Explanation / Answer

1.no of bromine atoms = no of moles * 6.023*10^23

2.no of atoms of cobalt   = no of moles*6.023*10^23

no of moles of cobalt    = no of atoms of cobalt/6.023*10^23

3. no of atoms = no of moles *6.023*10^23

    no of moles of Ca = no of calcium atoms/6.023*10^23

                                 = 2.02*10^24/6.023*10^23   = 3.354moles of Ca

4. no of F atoms = no of moles *6.023*10^23

                             = 2.97*6.023*10^23   = 1.78*10^24 F atoms

5. no of moles = W/G.M.Wt

                         = 43.9/40    = 1.0975 moles

6. mass of F   = no of moles * gram atomic mass

                        = 2.97*19 56.43g

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