Question

The heat capacity of aluminum is 25.4 J/mol • °C. How much energy is released when 5.00 g AI is cooled from 50°C to 30°C?

Select one:
O a. 2440 J
O b. 90 J
O c. 488 )
O d. 3.7 J

Answer 1

To calculate the energy released when 5.00 g of aluminum is cooled from 50°C to 30°C, use the formula Q = mcΔT. The correct answer is option O a. 2440 J.

Step-by-step explanation:

To calculate the energy released when 5.00 g of aluminum is cooled from 50°C to 30°C, we need to use the formula:

Q = mcΔT

Where Q is the energy released, m is the mass of the aluminum, c is the heat capacity of aluminum, and ΔT is the change in temperature.

First, we need to convert the mass of aluminum from grams to kilograms:

m = 5.00 g × (1 kg / 1000 g) = 0.005 kg

Next, we can calculate the energy released:

Q = (0.005 kg) × (25.4 J/mol °C) × (30°C - 50°C) = -1.27 kJ

The negative sign indicates that energy is being released.

Therefore, the correct answer is option O a. 2440 J.