How much thermal energy transfer is required to maintain constant temperature when?
How much thermal energy transfer is required to maintain constant temperature when?
How much thermal energy transfer is required to maintain constant temperature when 20.200000000000003 g of liquid water decompose to the elements hydrogen and oxygen at 25.0°C?
?H for this process is -285.8 kJ per mole of liquid water
Enter the magnitude of the energy transfer, that is do not include a plus or negative sign.
Tags: constant, Energy, maintain, much, required, temperature, Thermal, transfer
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2 Comments for How much thermal energy transfer is required to maintain constant temperature when?
1. Michael E | November 14th, 2010 at 3:49 pm
Whatever no of moles water x ?H. Surely you can work out moles.
2. Dietrich W | November 14th, 2010 at 4:19 pm
The molar mass of water, M ,is 18 g/mol and m is the actual mass then the number of mols of water are:
n= m/M = 20.200 / 18 = 1.122 mol
The heat Hr removed from or put in to mthe system is Hr= n* hr
=> Hr = 1.122* (-285.8) KJ = -320.394 KJ
The Heat is negative so 320.394 KJ must be removed in order to keep temperature of the system constant.
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