Question

If a gold ring weighs 25 grams. How much energy in Joules would it take to get it to reach its melting point if the ring starts out at 75 degrees C? (melting point is 1064 C, Cp for gold is .129 J/g-C.

Answer 1

Answer:

3.2 × 10³ J

Explanation:

Step 1: Given data

• Mass of the gold ring (m): 25 g

• Specific heat capacity of gold (Cp): 0.129 J/g.°C

• Initial temperature: 75 °C

• Final temperature: 1064 °C

Step 2: Calculate the temperature change (ΔT)

ΔT = 1064 °C - 75 °C = 989 °C

Step 3: Calculate the energy required (Q)

We will use the following expression.

Q = Cp × m × ΔT

Q = 0.129 J/g.°C × 25 g × 989 °C

Q = 3.2 × 10³ J