The specific heat of solid gold is 0.13 J/g • °C.How much heat is needed to raise the temperature of 25.0 g of gold from 23°C to its melting point at 1063°C?

Question

Quizplus · Accepted Answer

The heat needed to raise the temperature of a substance can be calculated using the formula:

q = m x c x ΔT

where q is the heat (in joules), m is the mass of the substance (in grams), c is its specific heat (in J/g•°C), and ΔT is the change in temperature (in °C).

Here, m = 25.0 g, c = 0.13 J/g•°C, ΔT = (1063°C - 23°C) = 1040°C.

So,

q = 25.0 g x 0.13 J/g•°C x 1040°C
  = 338 kJ
  = 3.4 kJ   (to one significant figure)

Therefore, the answer is B) 3.4 kJ.

The Specific Heat of Solid Gold Is 0