a) How many moles of atoms are in 7.00 g of 13C?

Answer “0.538” mol 13C

b) Based on your answer in Part A, calculate the number of atoms in this amount of 13C?

Answer “3.24×10^23” 13C atom

c) Based on your answer in Part B, how many electrons are in this amount of 13C?

______ electrons

d) Based on your answer in Part B, how many neutrons are in this amount of 13C?

______ neutrons

Answer:

a) How many moles of atoms are in 7.00 g of 13C?

Answer “0.538” mol 13C

1mol 13C has mass = 13g

7.00g 13C has mass = 7.00g/13g/mol = 0.538 mol atoms

b) Based on your answer in Part A, calculate the number of atoms in this amount of 13C?

1mol of atoms of any element contains 6.022*10^23 atoms

0.538 mol will contain 0.538*6.022*10^23 = 3.24*10^23 13C atoms

Answer “3.24×10^23” 13C atom

c) Based on your answer in Part B, how many electrons are in this amount

of 13C?

Each 13C atoms has 6 electrons

Number of electrons = 6*3.24*10^23 = 1.94*10^24 electrons.

d) Based on your answer in Part B, how many neutrons are in this amount of 13C?

13C means that the atom contains 6 protons , 6 electrons and 7 neutrons

Number of neutrons = 7* 3.24*10^23 = 2.27*10^24 neutrons.

a) How many moles of atoms are in 7.00 g of 13C?

( 7.00g /13.00g mol⁻¹ )

= 0.538 mol of carbon-13

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b) Based on your answer in Part A, calculate the number of atoms in this amount of 13C?

( 6.022 x 10²³ atoms / mol ) ( 0.538 mol of carbon-13 )

= 3.24 x 10²³ atoms of carbon-13

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c) Based on your answer in Part B, how many electrons are in this amount of 13C?

( 6 electrons / atom ) ( 3.24 x 10²³ atoms of carbon-13 )

= 1.95 x 10²⁴ electrons

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d) Based on your answer in Part B, how many neutrons are in this amount of 13C?

( 7 neutrons / atom ) ( 3.24 x 10²³ atoms of carbon-13 )

= 2.27 x 10²⁴ neutrons

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