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Calculate the number of moles for the fo...

Calculate the number of moles for the following:
(i) 52 g of He (finding mole from mass)
(ii) `12.044 × 10_(23)` number of He atoms (finding mole from number of particles).

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To solve the question, we will calculate the number of moles for helium (He) in two different scenarios: ### Part (i): Finding moles from mass 1. **Identify the given mass of helium**: - The mass of helium (m) given is 52 grams. 2. **Find the molar mass of helium**: ...
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NCERT ENGLISH-ATOMS AND MOLECULES -Exercise
  1. Calculate the number of moles for the following: (i) 52 g of He (fi...

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  2. In a reaction, 5.3 g of sodium carbonate reacted with 6 g of acetic ac...

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  3. Hydrogen and oxygen combine in the ratio of 1:8 by mass to form water....

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  4. Which postulate of Dalton’s atomic theory is the result of the law of ...

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

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  6. Define the atomic mass unit.

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

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

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

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  10. What is meant by the term chemical formula?

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

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

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

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

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

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

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  17. When 3.0 g of carbon is burnt in 8.00 g oxygen, 11.00 g of carbon diox...

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  18. What are polyatomic ions? Give examples.

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

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

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

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