Gravimetric and titration calculations -empirical, molecular and combustion analysis
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Gravimetric and titration calculations -empirical, molecular and combustion analysis

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Questions and Answers

What is the primary assumption made when conducting a combustion analysis

  • Some hydrogen may escape without being converted.
  • All hydrogen is converted to water vapor. (correct)
  • Some carbon may remain unconverted.
  • All carbon is converted to carbon monoxide.

    • In the given equation CxHy(s) + excess O2(g) ⟶ xCO2(g) + yH2O(g), what does 's' represent?

  • Standard form
  • Solid state (correct)
  • Sublimation
  • Stoichiometric

    • What is the empirical formula derived for polyethylene

  • $CH_3$
  • $C_2H_4$
  • $C_3H_6$
  • $CH_2$ (correct)

    • What is the molar ratio of hydrogen to carbon in polyethylene?

    <p>$2:1$</p> Signup and view all the answers

    What is the purpose of using excess O2 in combustion analysis?

    <p>To ensure complete combustion</p> Signup and view all the answers

    Why is it not necessary to have a balanced chemical equation for deriving the empirical formula?

    <p>The molar ratios are sufficient for formula derivation.</p> Signup and view all the answers

    If a compound had a molar ratio of hydrogen to carbon as 3:1, what would its empirical formula be?

    <p>$C_3H_6$</p> Signup and view all the answers

    If a compound had an empirical formula of $C_4H_{10}$, what would its molecular formula be?

    <p>$C_8H_{20}$</p> Signup and view all the answers

    What is the primary assumption made when conducting a combustion analysis as described in the text?

    <p>All the carbon in the sample combusted is converted to carbon dioxide.</p> Signup and view all the answers

    In the given equation CxHy(s) + excess O2(g) ⟶ xCO2(g) + yH2O(g), what does 's' represent?

    <p>Solid</p> Signup and view all the answers

    What is the molar ratio of hydrogen to carbon in polystyrene, as mentioned in the text?

    <p>2:1</p> Signup and view all the answers

    What is the purpose of using excess O2 in combustion analysis?

    <p>To prevent side reactions.</p> Signup and view all the answers

    If a compound had an empirical formula of $CH_3$, what would its molecular formula be?

    <p>$C_3H_9$</p> Signup and view all the answers

    What is the molar ratio of hydrogen to carbon in polyethylene, as calculated in the text?

    <p>$1:2$</p> Signup and view all the answers

    If a compound had a molar ratio of hydrogen to carbon as 4:1, what would its empirical formula be?

    <p>$C_2H_8$</p> Signup and view all the answers

    What does the molar ratio of hydrogen to carbon determine in a compound?

    <p>The chemical structure of the compound.</p> Signup and view all the answers

    In combustion analysis, why is it not necessary to have a balanced chemical equation for deriving the empirical formula?

    <p>Balancing equations does not affect the determination of empirical formulas.</p> Signup and view all the answers

    Which component of a combustion analysis device is labeled as 'O subscript 2 and other gases' at the end of a tube?

    <p>The exhaust outlet</p> Signup and view all the answers

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