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Calculate the number of molecules in 4 ...

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

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The correct Answer is:
`7.528 xx 10^(22)` molecules
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LAKHMIR SINGH & MANJIT KAUR-ATOMS AND MOLECULES-Exercise
  1. Calculate the number of molecules present in a drop of chloroform (...

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

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

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

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

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

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  7. Calculate the mole ratio of 240 g of calcium and 240 g of magnesium. ...

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  8. (a) Define mole. What are the two things that a mole represents. (b)...

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  9. (a) What is meant by 'a mole of carbon atoms' ? (b) Which has more...

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  10. (a) Define gram atomic mass of a substance. How much is the gram atomi...

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  11. (a) Define gram molecular mass of a substance. How much is the gram m...

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  12. (a) What is meant by the 'molar mass' of a substance ? State the unit ...

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  13. Which of the following pair of element represents a mole ratio of 1 : ...

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  14. Which of the following correctly represents 360 g of water? (i) 2 mo...

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  15. If 32 g of sulphur has x atoms, then the number of atoms in 32 g of o...

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  16. A student wants to have 3.011 xx 10^(23) atoms each of magnesium and ...

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  17. The ratio of moles of atoms in 12 g of magnesium and 16 g of sulphur w...

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  18. If 12 gram of carbon has x atoms, then the number of atoms in ...

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  19. Which of the following has the maximum number of atoms ?

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  20. If 1 gram of sulphur dioxide contains x molecules, how many molecule...

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