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(a) How many atoms are there in exactly...

(a) How many atoms are there in exactly 12g of carbon-12 element ? `(C = 12 u)`
(b) What name is given to this number ?
(c ) What name is given to the amount of substance containing this number of atoms ?

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Verified by Experts

The correct Answer is:
(a) `6.022 xx 10^(23)` , (b) Avogadro , (c ) Mole
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LAKHMIR SINGH & MANJIT KAUR-ATOMS AND MOLECULES-Exercise
  1. Find the mass of 2 moles of oxygen atoms ?

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  2. Fill in the following blanks : (a) 1 mole contains "…………." atoms, ...

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  3. (a) How many atoms are there in exactly 12g of carbon-12 element ? (...

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  4. Calculate the mass of 12.044 xx 10^(25) molecules of oxygen (O(2)).

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  5. What is the number of molecules in 1.5 moles of ammonia ?

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  6. How many moles of calcium carbonate (CaCO(3)) are present in 10 g o...

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  7. How many moles of O(2) are there in 1.20 xx 10^(22) oxygen molecu...

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  8. If one mole of nitrogen molecules weighs 28 g, calculate the mass of o...

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  9. How many moles are there in 34.5 g of sodium ? (Atomic mass of Na = 2...

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  10. What is the number of zinc atoms in a piece of zinc weighing 10 g ? ...

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  11. Calculate the mass of 3.011 xx 10^(24) atoms of carbon.

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  12. If 16 g of oxygen contains 1 mole of oxygen atoms, calculate the ma...

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  13. How many atoms are there in 0.25 mole of hydrogen ?

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  14. Calculate the number of moles iin 12.044 xx 10^(25) atoms of phosphoru...

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  15. Calculate the number of molecules present in a drop of chloroform (...

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  16. What is the mass of 5 moles of sodium carbonate (Na(2)CO(3)) ? (Atom...

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  17. Calculate the number of molecules in 4 g of oxygen .

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  18. How many moles are represented by 100 g of glucose. C(6)H(12)O(6) ...

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  19. Calculate the mass in grams of 0.17 mole of hydrogen sulphide , H(2)...

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  20. Show by means of calculations that 5 moles of CO(2) and 5 moles of ...

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