Question

5.6 г оксида кальция растворили в 994.4 мл воде определите массовую долю гидроксид кальция в % в полученном растворе

Answer 1

Ответ:

5.6+994.4=1000

5.6/1000*100=0.56мл

если ответ просят в литрах то

1000мл=1л

5.6/1=5.6

Answer 2

Calculating the Mass Fraction of Calcium Hydroxide in the Solution

To determine the mass fraction of calcium hydroxide in the solution, we can use the following formula:

Mass fraction = (mass of solute / total mass of solution) x 100%

Given: - Mass of calcium oxide (CaO) = 5.6 g - Volume of water = 994.4 mL

First, we need to calculate the mass of calcium hydroxide (Ca(OH)2) formed when calcium oxide is dissolved in water.

Step 1: Convert Volume to Mass of Water

The density of water is approximately 1 g/mL. Therefore, the mass of 994.4 mL of water can be calculated as:

Mass of water = Volume x Density = 994.4 g

Step 2: Calculate the Mass of Calcium Hydroxide Formed

When calcium oxide (CaO) is dissolved in water, it forms calcium hydroxide (Ca(OH)2) according to the following reaction:

CaO + H2O → Ca(OH)2

The molar mass of CaO is approximately 56.08 g/mol, and the molar mass of Ca(OH)2 is approximately 74.09 g/mol.

Using the equation: Mass = (Moles x Molar mass)

We can calculate the moles of CaO and then use stoichiometry to find the moles of Ca(OH)2 formed.

Step 3: Calculate the Mass Fraction of Calcium Hydroxide

Finally, we can use the mass of calcium hydroxide and the total mass of the solution to calculate the mass fraction of calcium hydroxide in the solution using the formula mentioned at the beginning.

I will now calculate the values and provide the result.