Question

Find no. of atoms in 12 g of ¹²C atom?
please derive this ! ​

Answer 1

Answer:

Let us analyse your hypothesis one by one:

Mass of one mole of C12 = 12 g.

so mass of 1 atom of C12 = 1.9927e-23 g.

Now, C12 has mass of 12 amu.

So 1 amu = (1.9987e-23 g)/12 = 1.66e-24 g

Now coming to part where you multiplied 12 amu to 1.66e-24 g. Carbon have 12 intra nuclear particles (i.e 6 protons and 6 neutrons), each having avg mass of 1 amu which is equivalent to 1.66e-24 g.

When you multiply it by 12 you again get mass of C12 atom in gram, but do not use amu unit with 12 because here 12 is the number of particles each having mass of 1.66e-24.

So mass of C12 = 12*(1.66e-24 g) = 1.9927e-23 g

Answer 2

Explanation:

12.00 g C-12 = 1 mol C-12 atoms = 6.022 × 1023 atoms • The number of particles in 1 mole is called Avogadro's Number (6.0221421 x 1023). Calculate the number of atoms in 2.45 mol of copper. A silver ring contains 1.1 x 1022 silver atoms...

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