Question

К карбиду кальция добавили 400 г 19,6 %-ного раствора серной кислоты. При этом выделилось 4,48 л ацетилена. Определите массовую долю серной кислоты в растворе после реакции. Даю много баллов. Умоляю помогите срочно.

Answer 1

решение данной задачи в фото

Answer 2

Calculation of the Mass Fraction of Sulfuric Acid in the Solution

To determine the mass fraction of sulfuric acid in the solution after the reaction, we need to use the given information about the amount of calcium carbide and the volume of acetylene gas produced.

Let's break down the problem step by step:

1. Calculate the number of moles of acetylene gas produced: - The volume of acetylene gas produced is given as 4.48 L. - The molar volume of any gas at standard temperature and pressure (STP) is 22.4 L/mol. - Therefore, the number of moles of acetylene gas produced can be calculated as: ``` Moles of acetylene gas = Volume of acetylene gas / Molar volume at STP = 4.48 L / 22.4 L/mol = 0.2 mol ```

2. Calculate the number of moles of sulfuric acid used in the reaction: - The concentration of the sulfuric acid solution is given as 19.6%. - This means that 19.6 g of sulfuric acid is present in 100 g of the solution. - We are given that 400 g of the 19.6% sulfuric acid solution is