Question

ребят выручайте! 71. При сгорании метана протекает экзотермическая реакция СН4(г) + 2О2(г) ⇄ СО2(г) + 2Н2О(г)Напишите выражение для константы равновесия этой системы. Какие внешние воздействия надо оказать на систему для увеличения выхода углекислого газа?71. К 100 мл 96%-го раствора H2SO4 (плотность раствора равна 1,84 г/мл) прибавили 400 мл воды. Получился раствор с плотностью, равной 1,225 г/мл. Чему равна процентная концентрация полученного раствора?

Answer 1

1. Константа равновесия это произведение концентрации конечных продуктов делить на произведение концентрации начальных ( с условием коэффициентов) 
СН4(г) + 2О2(г) ⇄ СО2(г) + 2Н2О(г)

Кр =( [CO2] *[H2O]^2 ) / ( [CH4]* [O2]^2)

Чтобы сместить равновесие в сторону образования углекислого газа ( это вправо),надо воспользоваться принципом ЛЕ-ШАТЕЛЬЕ
а) так как реакция экзотермическая ,протекает с выделением тепла, значит надо уменьшить температуру;
б) до реакции у нас 3 объема газа, после реакции тоже 3. значит давление НЕ влияет!
в) концентрация: надо уменьшить (убрать) из системы сам углекислый газ и воду, либо добавить метан и кислород.

 

2. Во вложениях.

Answer 2

Equilibrium Constant Expression:

The equilibrium constant expression for the given reaction can be written as follows:

Kc = [CO2] * [H2O]^2 / [CH4] * [O2]^2

Where [CO2], [H2O], [CH4], and [O2] represent the molar concentrations of carbon dioxide, water, methane, and oxygen, respectively, at equilibrium.

Increasing the Yield of Carbon Dioxide:

To increase the yield of carbon dioxide in the system, the following external influences can be applied:

1. Increasing the concentration of methane (CH4): According to Le Chatelier's principle, increasing the concentration of reactants can shift the equilibrium towards the products. Therefore, increasing the concentration of methane can favor the forward reaction, resulting in a higher yield of carbon dioxide.

2. Increasing the concentration of oxygen (O2): Similarly, increasing the concentration of oxygen can also shift the equilibrium towards the products, leading to an increased production of carbon dioxide.

3. Removing water (H2O): Since water is one of the products in the reaction, removing it from the system can help drive the equilibrium towards the products. This can be achieved by using a drying agent or applying other methods to remove water from the reaction mixture.

4. Lowering the temperature: Lowering the temperature can also favor the forward reaction, as it is an exothermic reaction. According to Le Chatelier's principle, decreasing the temperature can shift the equilibrium towards the products, resulting in a higher yield of carbon dioxide.

It's important to note that the specific conditions and limitations of the system should be considered when applying these external influences.

Calculation of Percent Concentration:

To calculate the percent concentration of the resulting solution, we need to determine the amount of sulfuric acid present in the solution after dilution.

Given: - Initial volume of 96% sulfuric acid solution (V1) = 100 mL - Final volume of the resulting solution (V2) = 100 mL + 400 mL = 500 mL - Density of the resulting solution (ρ) = 1.225 g/mL - Density of the 96% sulfuric acid solution = 1.84 g/mL

To find the percent concentration, we can use the formula:

Percent Concentration = (Mass of solute / Volume of solution) * 100

First, we need to calculate the mass of sulfuric acid in the initial solution:

Mass of sulfuric acid = Volume of solution * Density of solution

Mass of sulfuric acid = 100 mL * 1.84 g/mL

Next, we calculate the mass of sulfuric acid in the resulting solution:

Mass of sulfuric acid in resulting solution = Mass of sulfuric acid in initial solution

Finally, we can calculate the percent concentration of the resulting solution:

Percent Concentration = (Mass of sulfuric acid in resulting solution / Volume of resulting solution) * 100

Please note that the calculations provided here are based on the given information. If there are any additional factors or details that need to be considered, please provide them for a more accurate calculation.