Question

Рассчитайте: а)массу, б)объём газа, водорода Н2 количеством вещества 0.2 моль.определить массу 0.224 мл кислорода О2.ПОМОГИТЕ пожалуйста завтра экзамен!

Answer 1

Дано:
n (H₂) = 0,2 моль.
Найти:
m (H₂) – ? ;
V (H₂) – ?
Решение:
m (H₂) = 0,2 моль · 2 г/моль = 0,4 (г).
V (H₂) = 0,2 моль · 22,4 л/моль = 4,48 (л).
Ответ: m H₂ = 0,4 г ; V H₂ = 4,48 л.
________________________________________
Дано:
V (O₂) = 0,224 мл = 0,000224 л.
Найти:
m (O₂) – ?
Решение:
n (O₂) = 0,000224 л : 22,4 л/моль = 0,00001 (моль).
m (O₂) = 32 г/моль · 0,00001 моль = 0,00032 (г).
Ответ: m O₂ = 0,00032 г.

Answer 2

Calculation of Mass and Volume of Hydrogen Gas (H2)

To calculate the mass and volume of hydrogen gas (H2) with a given amount of substance of 0.2 moles, we can use the ideal gas law equation:

PV = nRT

Where: P = pressure (assumed to be constant) V = volume of the gas n = amount of substance (in moles) R = ideal gas constant T = temperature (assumed to be constant)

Let's assume that the pressure and temperature are constant. The ideal gas constant (R) is 0.0821 L·atm/(mol·K).

a) Calculation of Mass of Hydrogen Gas (H2): To calculate the mass of hydrogen gas, we need to know the molar mass of hydrogen (H2), which is approximately 2 g/mol.

The formula to calculate the mass of a substance is: Mass = molar mass × amount of substance

Given that the amount of substance is 0.2 moles, we can calculate the mass of hydrogen gas (H2) as follows:

Mass = 2 g/mol × 0.2 mol Mass = 0.4 g [[1]]

b) Calculation of Volume of Hydrogen Gas (H2): To calculate the volume of hydrogen gas, we rearrange the ideal gas law equation:

V = (nRT) / P

Given that the amount of substance is 0.2 moles, the ideal gas constant is 0.0821 L·atm/(mol·K), and the pressure and temperature are assumed to be constant, we can calculate the volume of hydrogen gas (H2) as follows:

V = (0.2 mol × 0.0821 L·atm/(mol·K) × T) / P

Please provide the values of pressure (P) and temperature (T) to calculate the volume of hydrogen gas (H2) accurately.

Calculation of Mass of Oxygen Gas (O2)

To calculate the mass of oxygen gas (O2) with a given volume of 0.224 mL, we need to know the molar mass of oxygen (O2), which is approximately 32 g/mol.

The formula to calculate the mass of a substance is: Mass = molar mass × amount of substance

Given that the volume is 0.224 mL, we need to convert it to liters (L) to use in the ideal gas law equation. Since 1 L = 1000 mL, the volume in liters is 0.224 mL / 1000 = 0.000224 L.

To calculate the amount of substance (n) of oxygen gas (O2), we can use the ideal gas law equation:

PV = nRT

Given that the pressure and temperature are assumed to be constant, we can rearrange the equation to solve for n:

n = (PV) / (RT)

Please provide the values of pressure (P) and temperature (T) to calculate the amount of substance (n) accurately.

Once we have the amount of substance (n) of oxygen gas (O2), we can calculate the mass as follows:

Mass = 32 g/mol × n Mass = 32 g/mol × (PV) / (RT)

Please provide the values of pressure (P) and temperature (T) to calculate the mass of oxygen gas (O2) accurately.

I hope this helps you with your exam preparation! Good luck!