Question

На сколько градусов можно нагреть 100 литров воды при сжигании 0,5 кг каменного угля если считать что плотность воды 1000 килограмм на метр кубический удельная теплота сгорания угля 30 на 10 в 6 степени дж/кг.

Answer 1

100л=0,1м(3) 0,1м(3)×1000кг/м(3)=100кг Кол-во теплоты, полученное при сгорании угля Q=qm 0,5кг×30×10(6)дж/кг=15000000дж Кол-во теплоты,которое нужно для нагрева воды: Q(2)=cm(дельта)t Q=Q(2) 15000000=4200×100×Х Х=15000000/4200×100 Х=35,7С(Цельсия)

Answer 2

Calculation of the Temperature Increase

To calculate the temperature increase when burning 0.5 kg of coal, we need to consider the specific heat capacity of water and the heat released during the combustion of coal.

Given: - Volume of water (V) = 100 liters = 100,000 cm³ = 100,000,000 mm³ - Density of water (ρ) = 1000 kg/m³ = 1 g/cm³ = 1 g/mL = 1 kg/L - Mass of coal (m) = 0.5 kg - Specific heat capacity of water (c) = 4.18 J/g°C (approximate value)

First, let's calculate the heat released during the combustion of coal using the specific heat of combustion of coal.

The specific heat of combustion of coal is given as 30 x 10^6 J/kg.

The heat released (Q) can be calculated using the formula: Q = m x q where m is the mass of coal and q is the specific heat of combustion of coal.

Substituting the values: Q = 0.5 kg x 30 x 10^6 J/kg = 15 x 10^6 J

Next, let's calculate the temperature increase (ΔT) using the formula: Q = m x c x ΔT where ΔT is the temperature increase.

Rearranging the formula, we get: ΔT = Q / (m x c)

Substituting the values: ΔT = (15 x 10^6 J) / (0.5 kg x 4.18 J/g°C) = 7,177.03 °C

Therefore, when burning 0.5 kg of coal, the temperature of 100 liters of water can increase by approximately 7,177.03 °C.

Please note that this calculation assumes that all the heat released during the combustion of coal is transferred