Question

student use a carbon pencil to write his homework the mass of that is 5 mg calculate the number of moles of carbon in his homework writing

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Answer 1

Answer:

Answer:

The answer is 6.022x10^20

Step-by-step explanation:

Mass of carbon is 0.005g

molar mass of carbon= 12g/mole

moles of carbon= 0.005/12                              (mass/molar mass)

=4.167x10^-4 moles

in 12mg the number of moles= 0.012/12

=0.001mole

number of atoms in 12mg

=0.001x6.022x10^23

=6.022x10^20

Explanation: