To determine whether a shiny gold-colored rock is actually gold, a chemistry stu

Question

To determine whether a shiny gold-colored rock is actually gold, a chemistry student decides to measure its heat capacity. She first weighs the rock and finds it has a mass of 5.2 g . She then finds that upon absorption of 60.0 J of heat, the temperature of the rock rises from 25 C to 56 C. Part A Find the specific heat capacity of the substance composing the rock. Express your answer to two significant figures and include the appropriate units. SubmitMy AnswersGive Up Part B Determine whether the value is consistent with the rock being pure gold. Determine whether the value is consistent with the rock being pure gold. yes no

Explanation / Answer

PART (A)

Useful formula,

q = m s (t2 - t1)

60.0 = 5.2 * s (56 - 25)

s = 0.37 J / g.0C

PART (B)

Specific heat of Gold = 0.13 J/g.0C

So, the rock is not gold.

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