# Point out the difference between 12 g of carbon and 12 u of carbon

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B. Point out the difference between 12 g of carbon and 12 u of carbon

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12 g of carbon is the molar mass of carbon and 12 u of carbon is the mass of one carbon atom

since ,

1u= 1 atomic mass unit =1.661$$\times 10^{-27} kg$$

$$\therefore$$ 12u = 19.93 $$\times 10^{-27}$$ kg

and  12 g= 12$$\times 10^{-3}kg$$

How many grams does an atom of hydrogen weigh ?