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Define the atomic mass unit....

Define the atomic mass unit.

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Atomic mass unit is equal to `1/12` (one-twelfth) the mass of a carbon-12 atom.
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LAKHMIR SINGH & MANJIT KAUR-ATOMS AND MOLECULES-Exercise
  1. Which postulate of Dalton’s atomic theory is the result of the law of ...

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  2. Which postulate of Dalton’s atomic theory can explain the law of defin...

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  3. Define the atomic mass unit.

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  4. Why is it not possible to see an atom with naked eyes?

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  5. Write down the formulae of (i) sodium oxide (ii) aluminium chlor...

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  6. Write down the names of compounds represented by the following formula...

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  7. What is meant by the term chemical formula?

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  8. How many atoms are present in a (i) H(2)S molecule and (ii) PO...

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  9. Calculate the molecular masses of H(2), O(2), Cl(2), CO(2), CH(4), C(2...

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  10. Calculate the formula unit masses of ZnO, Na(2)O, K(2)CO(3), given ato...

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  11. If one mole of carbon atoms weighs 12 grams, what is the mass (in gram...

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  12. Which has more number of atoms, 100 grams of sodium or 100 grams of ir...

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  13. A 0.24 g sample of compound of oxygen and boron was found by analysis ...

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  14. When 3.0 g of carbon is burnt in 8.0 g oxygen, 11.0 g of carbon dioxid...

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  15. What are polyatomic ions? Give examples.

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  16. Write the chemical formulae of the following. (a) Magnesium chlorid...

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  17. Give the names of the elements present in the following compounds. ...

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  18. Calculate the molar mass of the following substances. (a) Ethyne, ...

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  19. What is the mass of : (a) 1 mole of nitrogen atoms ? (b) 4 moles o...

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  20. Convert into moles : (a) 12 g of oxygen gas (b) 20 g of water ...

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