Question

1) Определите молярную массу воздуха, относительная молекулярная масса которого равна 29.2) Сколько молекул содержится в газе, кол-во вещества которого равно 1,2 моль.

Answer 1

1 какой-то бред, молекулярная масса - это масса молекулы в дальтонах, а молярная масса - масса одного моля вещества, в котором содержится 6*10^23 молекул и измеряется в граммах. Может что-то перепутано?
2) в 1 моле вещества содержится 6*10^23 молекул, поэтому в 1,2 моль содержится 6*1,2*10^23 = 7,2*10^23 молекул

Answer 2

Molar Mass of Air

The molar mass of air can be calculated by considering the relative molecular mass of its components. Air is primarily composed of nitrogen (N2) and oxygen (O2) molecules, with small amounts of other gases such as carbon dioxide (CO2), argon (Ar), and trace amounts of other gases.

To calculate the molar mass of air, we need to consider the relative molecular masses of these gases and their respective proportions in air.

The relative molecular mass of nitrogen (N2) is approximately 28.98 g/mol The relative molecular mass of oxygen (O2) is approximately 32 g/mol.

Since air is approximately 78% nitrogen and 21% oxygen, we can calculate the molar mass of air as follows:

Molar mass of air = (0.78 * 28.98 g/mol) + (0.21 * 32 g/mol)

Molar mass of air = 22.63 g/mol + 6.72 g/mol

Molar mass of air ≈ 29.35 g/mol

Therefore, the molar mass of air is approximately 29.35 g/mol.

Number of Molecules in 1.2 moles of Gas

To calculate the number of molecules in a given amount of gas, we can use Avogadro's number, which is approximately 6.022 x 10^23 molecules/mol.

Given that the amount of substance (moles) is 1.2 moles, we can calculate the number of molecules as follows:

Number of molecules = (Amount of substance) * (Avogadro's number)

Number of molecules = 1.2 moles * (6.022 x 10^23 molecules/mol)

Number of molecules ≈ 7.2264 x 10^23 molecules

Therefore, there are approximately 7.2264 x 10^23 molecules in 1.2 moles of gas.

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