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प्रश्न
A student puts his signature with a graphite pencil. If the mass of carbon in the signature is 10-12 g, calculate the number of carbon atoms in the signature.
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उत्तर
No. of atoms in 12 g C = 6.02 x 1023
∴ no. of carbon atoms in 10−12 g
= `(6.02 xx 10^23 xx 10^-12)/12`
= 5.016 x 1010 atoms
संबंधित प्रश्न
A gas cylinder can hold 1 kg of hydrogen at room temperature and pressure
1) Find the number of moles of hydrogen present.
2) What weight of CO2 can the cylinder hold under similar conditions of temperature and pressure? (H = 1, C = 12, O = 16)
3) If the number of molecules of hydrogen in the cylinder is X, calculate the number of CO2 molecules in the cylinder under the same conditions of temperature and pressure.
4) State the law that helped you to arrive at the above result.
Explain with examples what is meant by a 'mole' of a substance.
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How many moles of sulphur are present?
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How many molecules and atoms are present?
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