Question

Определите массу и число молекул азота(N2) взятого в количестве 3 моль

Answer 1

m=n*M= 3моль* 28г/моль=84г

N=6,02*1023 * 3 = 18.06  

Answer 2

Calculation of the Mass and Number of Molecules of Nitrogen (N2)

To determine the mass and number of molecules of nitrogen (N2) in a given quantity of 3 moles, we can use the following steps:

1. Find the molar mass of nitrogen (N2). 2. Calculate the mass of nitrogen (N2) using the molar mass and the number of moles. 3. Determine the number of molecules of nitrogen (N2) using Avogadro's number.

Let's go through each step in detail:

Step 1: Find the Molar Mass of Nitrogen (N2)

The molar mass of nitrogen (N2) can be calculated by adding up the atomic masses of its constituent atoms. The atomic mass of nitrogen (N) is approximately 14.01 atomic mass units (u).

Therefore, the molar mass of nitrogen (N2) is: Molar mass of N2 = 2 * Atomic mass of N = 2 * 14.01 u = 28.02 u.

Step 2: Calculate the Mass of Nitrogen (N2)

To calculate the mass of nitrogen (N2) in 3 moles, we can use the formula: Mass = Number of moles * Molar mass.

Substituting the values: Mass of N2 = 3 moles * 28.02 u/mole = 84.06 u.

Therefore, the mass of nitrogen (N2) taken in 3 moles is approximately 84.06 atomic mass units (u).

Step 3: Determine the Number of Molecules of Nitrogen (N2)

To determine the number of molecules of nitrogen (N2), we can use Avogadro's number, which states that one mole of any substance contains 6.022 x 10^23 particles (atoms, molecules, or ions).

The number of molecules can be calculated using the formula: Number of molecules = Number of moles * Avogadro's number.

Substituting the values: Number of molecules of N2 = 3 moles * (6.022 x 10^23 molecules/mole) = 1.8066 x 10^24 molecules.

Therefore, the number of molecules of nitrogen (N2) taken in 3 moles is approximately 1.8066 x 10^24 molecules.

In summary, the mass of nitrogen (N2) taken in 3 moles is approximately 84.06 atomic mass units (u), and the number of molecules of nitrogen (N2) is approximately 1.8066 x 10^24 molecules.

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