Question

How many kilojoules are required to raise the temperature of a 150. g sample of silver from 25 °C to 135 °C? Silver has a specific heat of 0.235 J/g °C.

A) 35.3 kJ
B) 110. kJ
C) 3.88 kJ
D) 0.0353 kJ
E) 16.5 kJ

Answer 1

To raise the temperature of a 150 g silver sample from 25°C to 135°C, approximately 3.88 kJ of energy is required based on the specific heat of silver.

Step-by-step explanation:

To find the amount of energy required to raise the temperature of the silver from 25 °C to 135 °C, we can use the formula Q = m * c * ΔT, where Q is the energy, m is the mass, c is the specific heat, and ΔT is the change in temperature. Given the mass of the silver is 150 g and the specific heat is 0.235 J/g °C, we can calculate the energy:

Q = 150 g * 0.235 J/g °C * (135 °C - 25 °C) = 150 * 0.235 * 110 = 3492.5 J

Converting the energy to kilojoules by dividing by 1000:

3492.5 J / 1000 = 3.4925 kJ

So, the correct answer is A) 3.88 kJ.