The identity of the sample is copper. The correct option is D. copper
To determine the identity of the sample, we will determine its specific heat, c.
From the formula
Q = mcΔT
Where Q is the quantity of heat
m is the mass
c is the specific heat of the substance
and ΔT is the change in temperature
From the given information
Q = 3080 J
m = 200 g
ΔT = T₂ - T₁ = 60°C - 20°C = 40°C
Putting the parameters into the formula, we get
3080 = 200 × c × 40
3080 = 8000c
∴ c = 3080 ÷ 8000
c = 0.385 J / g°C
From specific heat table, the substance that has a specific heat of 0.385 J / g°C is Copper.
Hence, the identity of the sample is copper. The correct option is D. copper
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