Question:

116 g of a substance upon dissociation reaction, yields 7.5 g of hydrogen, 60 g of oxygen and 48.5 g of carbon. Given that the atomic masses of H, O and C are 1, 16 and 12, respectively. The data agrees with how many formulae of the following? _______
A. \(CH_3COOH\)
B. \(HCHO\)
C. \(CH_3OOCH_3\)
D. \(CH_3CHO\)

Updated On: Nov 29, 2024
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Correct Answer: 2

Solution and Explanation

ElementMass%Moles%Relative moles
H6.466.462
O51.723.231
C41.813.481
\(∴\) Empirical formula = \(COH_2\)
The empirical formula goes with acetic acid \(CH_3COOH\) and formaldehyde \(HCHO.\)
Thus data agrees with \(2\) formulae.
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Concepts Used:

Rate of a Chemical Reaction

The rate of a chemical reaction is defined as the change in concentration of any one of the reactants or products per unit time.

Consider the reaction A → B,

Rate of the reaction is given by,

Rate = −d[A]/ dt=+d[B]/ dt

Where, [A] → concentration of reactant A

[B] → concentration of product B

(-) A negative sign indicates a decrease in the concentration of A with time.

(+) A positive sign indicates an increase in the concentration of B with time.

Factors Determining the Rate of a Reaction:

There are certain factors that determine the rate of a reaction:

  1. Temperature
  2. Catalyst
  3. Reactant Concentration
  4. Chemical nature of Reactant
  5. Reactant Subdivision rate