Gravimetric and titration calculations -empirical, molecular and combustion analysis

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to Lesson

Podcast

Play an AI-generated podcast conversation about this lesson

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

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

<p>To ensure complete combustion (B)</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. (A)</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>$C_3H_6$ (D)</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>$C_8H_{20}$ (B)</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. (C)</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 (A)</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 (D)</p> Signup and view all the answers

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

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

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

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

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

<p>$1:2$ (A)</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>$C_2H_8$ (C)</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. (B)</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. (B)</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 (B)</p> Signup and view all the answers

Flashcards are hidden until you start studying

More Like This

Use Quizgecko on...
Browser
Browser