Question

Ребят помогите с Химией. 8 класс Первая задача.определите сколько молекул содержится в 0,25 моль FeSO4. Вторая задача.Определите какое кол-во вещества Ho содержится столько молекул сколько их заключено в 360грамм воды.

Answer 1

1,5*10^23
2) 20 моль .
Если речь, в хлороводороде

Answer 2

First Problem: Number of Molecules in 0.25 moles of FeSO4

To determine the number of molecules in 0.25 moles of FeSO4, we can use Avogadro's number, which states that one mole of any substance contains approximately 6.022 x 10^23 particles (atoms, molecules, or ions).

The molar mass of FeSO4 can be calculated by adding up the atomic masses of its constituent elements: iron (Fe), sulfur (S), and oxygen (O). The atomic masses of these elements are approximately 55.85 g/mol, 32.07 g/mol, and 16.00 g/mol, respectively.

The molar mass of FeSO4 is: (1 x atomic mass of Fe) + (1 x atomic mass of S) + (4 x atomic mass of O) = (1 x 55.85 g/mol) + (1 x 32.07 g/mol) + (4 x 16.00 g/mol) = 151.91 g/mol.

Now, we can calculate the number of molecules in 0.25 moles of FeSO4 using the following formula:

Number of molecules = (Number of moles) x (Avogadro's number)

Substituting the values, we get: Number of molecules = 0.25 moles x (6.022 x 10^23 molecules/mol)

Let's calculate the result:

Number of molecules = 0.25 moles x (6.022 x 10^23 molecules/mol) = 1.5055 x 10^23 molecules.

Therefore, there are approximately 1.5055 x 10^23 molecules in 0.25 moles of FeSO4. [[1]]

Second Problem: Amount of Substance in 360 grams of Water

To determine the amount of substance (in moles) in 360 grams of water, we need to know the molar mass of water (H2O). The molar mass of water can be calculated by adding up the atomic masses of its constituent elements: hydrogen (H) and oxygen (O). The atomic masses of these elements are approximately 1.01 g/mol and 16.00 g/mol, respectively.

The molar mass of water is: (2 x atomic mass of H) + (1 x atomic mass of O) = (2 x 1.01 g/mol) + (1 x 16.00 g/mol) = 18.02 g/mol.

Now, we can calculate the number of moles of water in 360 grams using the following formula:

Number of moles = (Mass of substance) / (Molar mass)

Substituting the values, we get: Number of moles = 360 g / 18.02 g/mol

Let's calculate the result:

Number of moles = 360 g / 18.02 g/mol = 19.98 mol.

Therefore, there are approximately 19.98 moles of water in 360 grams of water. [[2]]

I hope this helps! Let me know if you have any further questions.