# Hard CHEM question!!?

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

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

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

selected by

a) How many moles of atoms are in 7.00 g of 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

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.

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by

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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