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(a) Define mole. What are the two things...

(a) Define mole. What are the two things that a mole represents.
(b) What weight of each element is present in `1.5` moles of sodium sulphate , `Na_(2)SO_(3)` ?
(Atomic masses : `Na = 23 u , C = 12 u , O = 16 u`)

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The correct Answer is:
(b) `Na = 69 g ; S = 48 g ; O = 72 g`
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LAKHMIR SINGH & MANJIT KAUR-ATOMS AND MOLECULES-Exercise
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  3. (a) Define mole. What are the two things that a mole represents. (b)...

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

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

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

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

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

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

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

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

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

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

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

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  16. The mass of one molecule of a substance is 4.65 xx 10^(-23) g. What is...

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  17. Which contains more molecules, 10 g of sulphur dioxide (SO(2)) or 10 g...

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  18. What weight of oxygen gas will contain the same number of molecules a...

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  19. What mass of nitrogen, N(2), will contain the same number of molecule...

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  20. If one grams of sulphur contains x atoms, calculate the number of ato...

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