Question

Помогите пожайлуста,это очень срочно! Заранее спасибо! Задача по химии:Сколько молекул содержится в 68 г H2S V=N дробь NA NA-число Авогадро.Если можно,то сделайте подробную задачу,заранее спасибо.

Answer 1

Дано: m (H2S) = 68 г
Найти: N - ?
Решение:
Cначала найдём n (кол-во вещ-ва)
n = m/M = 68/32 = 2 моль
Теперь найдём N по формуле
N = n* Na (число Авогадро)
N = 2 * 6 * 10 (в 23 степени) = 12 * 10 (в 23 степени) молекул
Ответ: N = 12 * 10 (в 23 степени) молекул

Answer 2

Calculation of the Number of Molecules in 68 g of H2S

To calculate the number of molecules in 68 g of H2S, we need to use the concept of Avogadro's number (NA). Avogadro's number is defined as the number of atoms or molecules in one mole of a substance, and its value is approximately 6.022 x 10^23.

First, we need to determine the molar mass of H2S (hydrogen sulfide). The molar mass is the mass of one mole of a substance and is calculated by summing the atomic masses of all the atoms in the molecule.

The atomic masses of hydrogen (H) and sulfur (S) are approximately 1 g/mol and 32 g/mol, respectively. Since there are two hydrogen atoms in H2S, the molar mass of H2S is:

Molar mass of H2S = (2 x atomic mass of H) + atomic mass of S = (2 x 1 g/mol) + 32 g/mol = 2 g/mol + 32 g/mol = 34 g/mol

Now, we can calculate the number of moles of H2S in 68 g using the formula:

Number of moles = Mass / Molar mass

Number of moles of H2S = 68 g / 34 g/mol = 2 mol

Finally, we can calculate the number of molecules using Avogadro's number:

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

Number of molecules of H2S = 2 mol x (6.022 x 10^23 molecules/mol) = 1.2044 x 10^24 molecules

Therefore, there are approximately 1.2044 x 10^24 molecules in 68 g of H2S.

Answer:

There are approximately 1.2044 x 10^24 molecules in 68 g of H2S.