Question

ЭТОТ АККАУНТ НЕ ЗАБАНЯТ!!! Прошу подробное объяснение...Что куда и зачем писать.Зачем делим или умножаем и т.д Дано смесь 120л C3H6 - 25% CH4 - 5% V(O2) - ?

Answer 1

Находим объем пропана С3Н6, для этого объем смеси умножаем на объемную долю пропана в смеси 25% или 0,25
V(C3H6) = 120 л*0,25 = 30 л
По такому же алгоритму находим объем метана СН4 
V(CH4) = 120 л*0,05 = 6 л
Для того, чтобы найти объем кислорода, необходимо составить два уравнения реакций горения отдельно для пропана и метана, и исходя из них найти объемы кислорода.
С3Н8 + 5О2 = 3СО2 + 4Н2О  (УХР1)
Из УХР(1) следует, что для сжигания 1 моль пропана необходимо 5 моль кислорода, из этого следует вывод: n(O2)=5n(C3H8) или 
V(O2)=5*V(C3H8) = 30 л*5=150 л
СН4 + 2О2 = СО2 + 2Н2О (УХР2)
Из УХР(2) следует, что для сжигания 1 моль метана необходимо 2 моль кислорода, следовательно, n(O2) = 2n(CH4) или
V(CH4)=2*V(CH4) = 2*6 л = 12 л
УХР - уравнение химической реакции
Находим общий объем кислорода:
V'"(O2) = 150 л + 12 л = 162 л
Ответ: 162 л 

Answer 2

Understanding Chemical Reactions and Stoichiometry

When dealing with chemical reactions and stoichiometry, it's important to understand the purpose and process of balancing equations, determining reactants and products, and calculating quantities of substances involved. Let's break down the given information and address each aspect step by step.

Given Mixture

The given mixture consists of 120 liters and contains the following components: - C3H6: 25% - CH4: 5% - V(O2): Unknown percentage

Purpose of Balancing Equations

Balancing chemical equations is essential to ensure that the law of conservation of mass is obeyed. This means that the same number of each type of atom must appear on both sides of the equation. For example, in the reaction C3H6 + O2 → CO2 + H2O, the equation must be balanced to ensure that the number of carbon, hydrogen, and oxygen atoms is the same on both sides.

Determining Reactants and Products

In a chemical reaction, the reactants are the substances that are consumed, and the products are the substances that are formed. The stoichiometry of a reaction allows us to determine the quantities of reactants and products involved in the reaction.

Calculating Quantities of Substances

Stoichiometry involves using the balanced chemical equation to calculate the quantities of reactants and products in a chemical reaction. This can include determining the amount of a product formed from a given amount of reactant, or the amount of reactant needed to produce a certain amount of product.

Conclusion

In the given scenario, understanding the composition of the mixture and the principles of chemical reactions and stoichiometry will be crucial in determining the specific quantities of C3H6, CH4, and V(O2) present in the 120-liter mixture. Further information about the specific chemical reactions and their stoichiometry would be needed to perform the necessary calculations.