Molar heat capacity at constant pressure of aluminium is 24 JK-mol-1. Quantity of heat to raise the
temp of 3g metallic aluminium from 30°C to 70°C is
please do let me know the answer
Answers
Answer:
96J
Explanation:
q=nCp(T1-T2)
=3/27×4×30
=96J
The quantity of heat to raise the temperature from 30° to 70°C of 3g Al is 105.6 kJ.
We have to find quantity of heat to raise the temperature of 3g metallic aluminium from 30°C to 70°C, if molar heat capaicty at constant pressure of aluminium is 24 kj/mol/K.
Given, Weight of aluminium = 3g
Atomic weight of aluminium = 27g/mol
∴ No of moles of aluminium, n = weight of aluminium/atomic weight of aluminium
= 3/27 = 1/9 = 0.11 mol
Molar heat capacity at constant pressure, Cp = 24 kj/mol/K
Change in temperature, ΔT = 70°C - 30°C = 40°C
Using formula, quantity of heat, Q = nCpΔT
= 0.11 mol × 24 kj/mol/K × 40K
[ change in temperature in °C = change in temperature in K, ∴ ΔT = 40°C = 40K ]
= 105.6 kj
Therefore the quantity of heat is 105.6kJ.
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