How does water’s high specific heat capacity affect large lakes?
2 answers:
Answer: D. The water in a lake changes temperature slowly.
Explanation: Specific heat is the amount of heat required to raise the temperature of 1 gram of substance through .
Evaporation is the process in which liquid state is changed to gaseous state at any temperature.
Water has high specific heat due to the presence of strong hydrogen bonds which requires large amount of heat to raise the temperature of water. Thus the molecules will not be able to gain enough kinetic energy and thus temperature changes slowly.
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Taking into account the definition of enthalpy of a chemical reaction, the quantity of heat released when 0.75 moles of Mg are burned is 451.5 kJ.
<h3>Enthalpy of a chemical reaction</h3>The enthalpy of a chemical reaction is known as the heat absorbed or released in a chemical reaction when it occurs at constant pressure. That is, the heat of reaction is the energy that is released or absorbed when chemicals are transformed into a chemical reaction.
The enthalpy is an extensive property, that is, it depends on the amount of matter present.
<h3>Heat released in this case</h3>In this case, the balanced reaction is:
2 Mg(s) + O₂ (g) → 2 MgO(s) + 1204 kJ
This equation indicates that when 2 moles of Mg reacts with 1 mole of O₂, 1204 kJ of heat is released.
When 0.75 moles of Mg are burned, then you can apply the following rule of three: if 2 moles of Mg releases 1204 kJ of heat, 0.75 moles of Mg releases how much heat?
<u><em>heat= 451.5 kJ</em></u>
Finally, the quantity of heat released when 0.75 moles of Mg are burned is 451.5 kJ.
Learn more about enthalpy of a chemical reaction:
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