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Mole Concept

How do we fin...

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How do we find atomic mass with carbon-12 atom?

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Solution

Avogadro's number is formally defined as the number of carbon-12 atoms in 12 grams (0.012 kg) of carbon-12, which is approximately $6.023 \times 10^{23}$ . Carbon-12 was chosen as the reference substance because its atomic mass could be measured accurately.

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Q. So since 1 atomic unit is exactly 1/12 the mass of 1 c-12 atom,
can we say as follows;
atomic mass of sodium is 23 , so can we say that the atomic mass of sodium is 23 times heavier than 1/12 the mass of 1 carbon-12 atom?

The atomic mass of oxygen is 16u.

Considering the above statement, which among the following options can be inferred?

0.1 m o l e

of Buckminster fullerene contains how many kg of carbon?
[Atomic mass of carbon

= 12

Atomic mass tells us how heavy is an atom as compared to 1/12th mass of the carbon.

Q. Why oxygen was removed from being considered as the standard unit for measuring the atomic mass.? And now why we are using carbon 12 atom?
what is carbo 12 atom?

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