Calculate the mass of benzoic acid that can be obtained by oxidizing toluene with a mass

| May 14, 2021 | education

Calculate the mass of benzoic acid that can be obtained by oxidizing toluene with a mass of 7.36 g. Mass fraction of the acid yield is 55%.

Let’s execute the solution step by step:
1. Let us write the equation for the synthesis of benzoic acid:
5C6H5 – CH3 + 6KMnO4 + 9H2SO4 = 6MnSO4 + 3K2SO4 + 14H2O + 5C6H5 – COOH;
2. Let’s calculate the molar masses of toluene, benzoic acid:
M (C6H5 – CH3) = 80 g / mol;
M (C6H5 – COOH) = 122 g / mol.
3. Calculate the number of moles of toluene if the mass is known:
Y (C6H5 – CH3) = m / M = 7.36 / 80 = 0.09 mol;
Y (C6H5 – COOH) = 0.09 mol, since according to the equation the number of moles is 5.
4. Find the mass of benzoic acid:
m (C6H5 – COOH) = Y * M = 0.09 * 122 = 10.98 g.
Answer: during the reaction, benzoic acid with a mass of 10.98 g is released.



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