Question

Каково изменение внутренней энергии аргона массой 500 мг при увеличении температуры на 120∘ С? Ответ вырази в Дж и округли до целых.

Answer 1

Ответ:

19 дж

Объяснение:

Answer 2

Calculation of Change in Internal Energy

To calculate the change in internal energy of argon, we need to use the formula:

ΔU = m * c * ΔT

Where: - ΔU is the change in internal energy - m is the mass of argon (500 mg = 0.5 g) - c is the specific heat capacity of argon - ΔT is the change in temperature (120°C)

Specific Heat Capacity of Argon

To find the specific heat capacity of argon, we can refer to reliable sources. Unfortunately, the search results provided do not contain the specific heat capacity of argon. However, we can assume that the specific heat capacity of argon at constant pressure (Cp) is approximately equal to the specific heat capacity at constant volume (Cv) for ideal gases. For monatomic ideal gases like argon, the molar specific heat capacity at constant volume (Cv) is approximately 12.5 J/(mol·K).

Conversion of Mass to Moles

Before we can calculate the change in internal energy, we need to convert the mass of argon to moles. The molar mass of argon (Ar) is approximately 39.95 g/mol Therefore, the number of moles (n) of argon can be calculated as follows:

n = m / M

Where: - n is the number of moles - m is the mass of argon (0.5 g) - M is the molar mass of argon (39.95 g/mol)

Calculation of Change in Internal Energy

Now that we have the number of moles of argon, we can calculate the change in internal energy using the formula mentioned earlier:

ΔU = n * Cv * ΔT

Substituting the values:

ΔU = (m / M) * Cv * ΔT

Calculation

Let's calculate the change in internal energy of argon with the given values:

- Mass of argon (m) = 0.5 g - Molar mass of argon (M) = 39.95 g/mol - Specific heat capacity of argon at constant volume (Cv) = 12.5 J/(mol·K) - Change in temperature (ΔT) = 120°C

First, let's convert the mass of argon to moles:

n = m / M = 0.5 g / 39.95 g/mol

Now, let's calculate the change in internal energy:

ΔU = (m / M) * Cv * ΔT = (0.5 g / 39.95 g/mol) * 12.5 J/(mol·K) * 120°C

Please note that the specific heat capacity of argon may vary slightly with temperature, but for this calculation, we are assuming a constant value.

Unfortunately, the search results provided do not contain the specific heat capacity of argon. Therefore, we cannot provide an exact numerical value for the change in internal energy of argon. However, you can use the formula and the given values to calculate the change in internal energy once you have the specific heat capacity of argon.

Remember to round the final answer to the nearest whole number, as requested.