Question

calculate the mass of c12 atom​

Answer 1

It is expressed as a multiple of one-twelfth the mass of the carbon-12 atom, 1.992646547 × 10−23 gram, which is assigned an atomic mass of 12 units. In this scale 1 atomic mass unit (amu) corresponds to 1.660539040 × 10−24 gram.

Answer 2

Answer:

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