Question

Даю 100 балов!7. Знайдіть температуру 10 г водню при тискові 200 кПа в посудині об’ємом 1 л. 8. Визначити силу поверхневого натягу, яка діє на квадрат стороною 4 см, який лежить на поверхні спирту.

Answer 1

1)PV=mRT , m - кількість речовини
T=PV/mR= 200/0.831*2=120 K
2)q - поверхневий натяг спирту 23 * 10^(-3) Н / м
F=q*a, а - сторона квадрата
F=23*10^(-3)*0,04=0.92*10^(-3) Н

Answer 2

Temperature of 10 g of Hydrogen at 200 kPa in a 1 L Container

To find the temperature of 10 g of hydrogen at 200 kPa in a 1 L container, we can use the ideal gas law equation: PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature.

First, we need to calculate the number of moles of hydrogen. To do this, we can use the molar mass of hydrogen, which is approximately 2 g/mol. Since we have 10 g of hydrogen, the number of moles can be calculated as follows:

Number of moles = Mass / Molar mass Number of moles = 10 g / 2 g/mol Number of moles = 5 mol

Now, we can rearrange the ideal gas law equation to solve for temperature:

T = PV / (nR)

Substituting the given values:

T = (200 kPa) * (1 L) / (5 mol * 8.314 J/(mol*K)) T = 40 kJ / (41.57 J/K) T ≈ 962 K

Therefore, the temperature of 10 g of hydrogen at 200 kPa in a 1 L container is approximately 962 K.

Surface Tension Force on a 4 cm by 4 cm Square in Contact with Alcohol

To determine the surface tension force acting on a square with sides measuring 4 cm in contact with alcohol, we can use the formula:

Force = Surface tension * Perimeter

The surface tension is a property of the liquid and represents the force per unit length acting perpendicular to the surface. The perimeter of the square is equal to 4 times the length of one side.

Given that the side length of the square is 4 cm, the perimeter can be calculated as follows:

Perimeter = 4 * Side length Perimeter = 4 * 4 cm Perimeter = 16 cm

Now, we need to find the surface tension of alcohol. The surface tension of a liquid can vary depending on factors such as temperature and impurities. Without specifying the type of alcohol or the temperature, it is difficult to provide an exact value for the surface tension. However, the surface tension of common alcohols like ethanol and isopropyl alcohol is typically around 22-24 mN/m (millinewtons per meter).

Assuming a surface tension of 22 mN/m, we can calculate the force as follows:

Force = Surface tension * Perimeter Force = 22 mN/m * 16 cm Force = 352 mN

Therefore, the force of surface tension acting on a 4 cm by 4 cm square in contact with alcohol, assuming a surface tension of 22 mN/m, is approximately 352 mN.