Question

На спиртовке нагревали воду массой 100 г от 16 до 71°С . При этом был сожжен спирт массой 10 г. Найдите КПД установки.

Answer 1

Q=cm(t2-t1) т. е. находим кпличество теплоты 0.1кг*(71-16). Далее по справочнику берем теплотворную способность спирта и умножаем ее на массу спирта. Потом первый результат делим на второй и умнож на100 (если нужен КПД в процентах)

Answer 2

Calculation of Efficiency (КПД) of the Setup

To find the efficiency (КПД) of the setup, we need to calculate the amount of heat gained by the water and compare it to the amount of heat provided by burning the alcohol.

The formula for efficiency (КПД) is:

КПД = (Qг / Qн) * 100%

Where: - КПД is the efficiency of the setup. - Qг is the heat gained by the water. - Qн is the heat provided by burning the alcohol.

To calculate Qг, we can use the formula:

Qг = m * c * ΔT

Where: - m is the mass of the water (100 g). - c is the specific heat capacity of water (4.18 J/g°C). - ΔT is the change in temperature (71°C - 16°C = 55°C).

Substituting the values into the formula, we get:

Qг = 100 g * 4.18 J/g°C * 55°C

Calculating Qг, we find:

Qг = 22990 J

To calculate Qн, we can use the formula:

Qн = m * L

Where: - m is the mass of the alcohol burned (10 g). - L is the heat of combustion of the alcohol.

Unfortunately, the heat of combustion of the alcohol is not provided in the given information. Therefore, we cannot calculate Qн and, subsequently, the efficiency (КПД) of the setup.

Please provide the heat of combustion of the alcohol burned so that we can calculate the efficiency (КПД) for you.