Answer:
The Old Thermodynamist says:
Recall ΔH = m•Cp•ΔT where H is enthalpy (heat), m is mass Cp is heat capacity and ΔT is temperature change.
The heat capacity of water is dependent on temperature, but is commonly taken as 4.186kJ/kg-K
In this case, we have 8kg of water and a temperature change ΔT = 80K
So ΔH = 8(4.186)(80) = 2679.0kJ
The heat required is 2679.0kJ (which is 0.744kWh
Explanation:
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Answer:
28 moles of X.
Explanation:
Let's consider the complete combustion of ethanol.
C₂H₆O(l) + 3 O₂(g) ⇒ 2 CO₂(g) + 3 H₂O(l)
When 1 mole of ethanol burns it releases 1370 kJ, that is, the enthalpy of combustion is -1370 kJ/mol. If the energy released by one mole of etanol were used to syntesize the compound X, it would take 45.9 kJ to form 1 mole of X, that is, the enthalpy of formation is -49.5 kJ/mol. Then,

Answer:
If the polarity of a moving magnet is reversed, then the current induced in a loop of wire will reverse in direction, because magnet polarity determines the direction of the electromagnetic force.
The answer is Deserts receive less precipitation than samiarid regions .