Question

find atomic number of ¹²6C​

Answer 1

Answer:

The atomic weight of carbon = 12 g and the given weight = 12 g

As we know that, No. of moles=Molecular weightGiven weight

∴ No. of moles of Carbon in 12 g =1212=1 mole

No. of atoms present in 1 mole of Carbon =NA=6.023×1023

As 1 mole of carbon contains 6 electrons, 6 protons and 6 neutrons.

∴ No. of electrons in 6.023×1023 atoms of carbon=6×6.023×1023

Similarly,

No. of protons in 6.023×1023 atoms of carbon=6×6.023×1023

No. of neutrons in 6.023×1023 atoms of carbon=6×6.023×1023

∴ Sum of electrons, protons and neutrons in 12g of carbon = no. of electrons in 12 g carbon + no. of protons in 12 g carbon + no. of neutrons in 12 g carbon

=6×6.023×1023+6×6.023×1023+6×6.023×1023

=108.414×1023=1.084×1025

Explanation:

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