Question

Имеется 2,7 моль кислорода О2 при н.у. Определите массу кислорода, его объем, а также число имеющихся молекул кислорода. дам 50 баллов!! СРОЧНО!!

Answer 1

Ответ: 86.4 г; 60,48 л; 1,6254*10²⁴ молекул

Дано:

n(O2) = 2,7 моль

m(O2)-?

V(O2)-?

N(O2)-?

Объяснение:

M(O2) = 32 г/моль

m(O2) = n(O2)*M(O2) = 2,7 моль*32 г/моль = 86,4 г

Vm = 22,4 л/моль

V(O2) = n(O2)*Vm = 2,7 моль*22,4 л/моль = 60,48 л

$N_A=6,02*10^{23}mol^{-1}\\N(O_2) = n(O_2)*N_A$

N(O₂) = 2,7 моль*6,02*10²³ моль⁻¹ = 1,6254*10²⁴ молекул

Ответ: 86.4 г; 60,48 л; 1,6254*10²⁴ молекул

Answer 2

Calculation of Oxygen Mass, Volume, and Number of Molecules

To determine the mass, volume, and number of molecules of oxygen (O2) at standard temperature and pressure (n.u.), we can use the ideal gas law equation:

PV = nRT

Where: - P is the pressure (at n.u., it is approximately 1 atmosphere or 101.325 kilopascals) - V is the volume - n is the number of moles - R is the ideal gas constant (approximately 0.0821 L·atm/(mol·K)) - T is the temperature (at n.u., it is approximately 273.15 Kelvin)

Given that we have 2.7 moles of oxygen (O2) at n.u., we can calculate the volume using the ideal gas law equation. Let's assume the temperature is 273.15 Kelvin.

Step 1: Calculate the volume:

PV = nRT

V = (nRT) / P

V = (2.7 mol * 0.0821 L·atm/(mol·K) * 273.15 K) / 1 atm

V ≈ 59.47 liters

Therefore, the volume of 2.7 moles of oxygen (O2) at n.u. is approximately 59.47 liters.

Step 2: Calculate the mass:

To calculate the mass of oxygen (O2), we need to know the molar mass of oxygen. The molar mass of oxygen is approximately 32 grams per mole.

Mass = n * molar mass

Mass = 2.7 mol * 32 g/mol

Mass = 86.4 grams

Therefore, the mass of 2.7 moles of oxygen (O2) at n.u. is approximately 86.4 grams.

Step 3: Calculate the number of molecules:

To calculate the number of molecules, we can use Avogadro's number, which is approximately 6.022 x 10^23 molecules per mole.

Number of molecules = n * Avogadro's number

Number of molecules = 2.7 mol * 6.022 x 10^23 molecules/mol

Number of molecules ≈ 1.63 x 10^24 molecules

Therefore, the number of molecules in 2.7 moles of oxygen (O2) at n.u. is approximately 1.63 x 10^24 molecules.

In summary: - The mass of 2.7 moles of oxygen (O2) at n.u. is approximately 86.4 grams. - The volume of 2.7 moles of oxygen (O2) at n.u. is approximately 59.47 liters. - The number of molecules in 2.7 moles of oxygen (O2) at n.u. is approximately 1.63 x 10^24 molecules.

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