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If the law of constant compositon is tru...

If the law of constant compositon is true, what weights of calcium carbon, and oxygen are present in `1.5 g` of calcium carbonate, if a sample of calcium carbonate from another source contains the following percentage composition: `Ca = 40.0%, C = 12.0%`, and `O = 48.0%`?

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DINESH PUBLICATION-ATOMS AND MOLECULES-SHORT ANSWER
  1. (a) Define atomic mass unit. (b) Distinguish between molecular mass ...

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  2. What is meant by the term chemical formula ? Write the chemical formul...

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  3. If the law of constant compositon is true, what weights of calcium car...

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  4. Calculate formula unit mass of Al(2)(SO(4))(3)

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  5. (a) State six postulates of Dalton's atomic theory. (b) A 0.24g samp...

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  6. How many grams of sodium wil have the same number of atoms as 6 grams ...

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  7. Calculate the mass of 1.2044 xx 10^(23) molecules of O(2) ("Atomic mas...

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  8. (a) Define polyatomic ions. Write an example. (b) Calculate the form...

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  9. Write the molecular formulae of all the compounds that can be formed b...

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  10. What are chemical reactions according to the Law of conservation of ma...

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  11. Write the chemical formulae of the following: (a)Magnesium chloride ...

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  12. A compound XH is formed by the combination of an element X with hydrog...

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  13. Calculate the number of molecules of SO(2) present in 44g of it.

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  14. Write the formula and names of the compounds formed by the followin io...

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  15. Calculate formula unit mass of Na(2)CO(3).10H(2)O

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  16. Calculate the number of molecular of sulphur (S(8)) present in 128g of...

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  17. Calculate the numbe of oxygen atoms present in 120g of nitric acid (HN...

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  18. In a chemical reaction, 10.6g of sodium carbonate reacted with 12g of ...

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  19. Write the chemical names of the following compounds: (a)K(2)SO(4) (b...

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  20. How did Berzelius assign symbols to the elements?

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