Question

Порцию раствора фенола в толуоле массой 20 г обработали избытком натрия. В результате реакции образовался газ объемом 672 мл (н.у.). Вычислите массовую долю фенола в растворе толуола.В ответе 14,1 %, мне нужно расписанное решение.Заранее огромное спасибо)

Answer 1

Решение huliganka профессор правильное... Мне нет смысла ещё раз писать... В вашем ответе 14,1 %, очевидно ОПЕЧАТКА!!!

Answer 2

2C6H5OH+2Na=2C6H5ONa+H2

 2                                                      1

n(H2)=0,672/22,4=0,03; n(C6H5OH)=0,03*2=0,06;  m(C6H5OH)=0,06*94=5,64;

W(C6H5OH)=5,64/20=0,282(28,2%).

....................................................................................................................................................................

.................................................................................................................................................................

Answer 3

Calculating the Mass Fraction of Phenol in Toluene Solution

To calculate the mass fraction of phenol in the toluene solution, we can use the information provided about the reaction and the volume of gas produced.

Given: - Mass of phenol in toluene solution = 20 g - Volume of gas produced = 672 mL (at standard temperature and pressure)

First, let's calculate the molar volume of the gas at standard temperature and pressure (STP). The molar volume of an ideal gas at STP is 22.4 L/mol.

Step 1: Calculate the Number of Moles of Gas Produced

Using the molar volume of gas at STP: - Number of moles of gas produced = Volume of gas produced / Molar volume at STP - Number of moles of gas produced = 672 mL / 1000 (to convert to liters) / 22.4 L/mol

The number of moles of gas produced can be calculated using the given volume of gas produced.

Step 2: Determine the Stoichiometry of the Reaction

The reaction of phenol with excess sodium likely produces hydrogen gas according to the following equation: C6H5OH + 2Na → C6H5ONa + H2

Step 3: Calculate the Number of Moles of Phenol

Using the stoichiometry of the reaction: - Number of moles of phenol = Number of moles of gas produced / 1 (from the balanced equation)

Step 4: Calculate the Mass of Phenol

Using the molar mass of phenol (C6H5OH): - Mass of phenol = Number of moles of phenol * molar mass of phenol

Step 5: Calculate the Mass Fraction of Phenol

- Mass fraction of phenol = (Mass of phenol / Total mass of solution) * 100%

Let's perform the calculations based on the given information.