Gravimetric and titration calculations -empirical, molecular and combustion analysis

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18 Questions

What is the primary assumption made when conducting a combustion analysis

All hydrogen is converted to water vapor.

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

Solid state

What is the empirical formula derived for polyethylene

$CH_2$

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

$2:1$

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

To ensure complete combustion

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

The molar ratios are sufficient for formula derivation.

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

$C_3H_6$

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

$C_8H_{20}$

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

All the carbon in the sample combusted is converted to carbon dioxide.

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

Solid

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

2:1

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

To prevent side reactions.

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

$C_3H_9$

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

$1:2$

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

$C_2H_8$

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

The chemical structure of the compound.

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

Balancing equations does not affect the determination of empirical formulas.

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

The exhaust outlet

Learn about gravimetric methods, the processes involved, and their importance in quantitative chemical analysis. Explore how mass measurements are used to determine the moisture content of samples through controlled heating processes.

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