In 1879, a monolith of malachite weighing 1054 kg was found in the Urals. How much has its internal energy changed

| November 17, 2020 | education

In 1879, a monolith of malachite weighing 1054 kg was found in the Urals. How much has its internal energy changed if the temperature increased by 20 ° C during transportation?

Given:
m = 1054 kg.
∆t = 20 ºС.
C = 288 – 372 J / (kg * K).
The change in internal energy during heat exchange is calculated by the formula:
∆U = Q = C * m * ∆t, where Q is the amount of heat obtained by malachite, C is the specific heat capacity of malachite (we take the average value C = 330 J / (kg * K)), m is the mass of malachite, ∆t is the change temperature of malachite.
Let’s calculate the increase in the internal energy of malachite:
∆U = Q = C * m * ∆t = 330 * 1054 * 20 = 6956400 J ≈ 6.96 MJ.
Answer: The internal energy of malachite will increase by 6.96 MJ.



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