Without the atmosphere, life on Earth would not be possible. Which of the following is NOT an explanation for how Earth’s atmosp
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(1) The quantity of heat required to melt 175 g Cu is 35.88 kJ.
(2) The substance that releases 21.2 kJ of energy when 1.42 mol of it freezes is iron.
<h3>What is heat of fusion?</h3>Heat of fusion is the energy required to melt 1 mole of a substance.
<h3>What is heat of vaporization?</h3>The heat energy required to vaporize 1 mole of a substance has been heat of vaporization.
Heat of fusion of copper (Cu) is given as 13 kJ/mol
Number of moles of 175 g of copper = 175/63.5 = 2.76 moles
Q = nΔH
Q = 2.76 mol x 13 kJ/mol = 35.88 kJ
Thus, the quantity of heat required to melt 175 g Cu is 35.88 kJ.
<h3>Heat of fusion of the substance</h3>ΔH(fus) = Q/n
where;
- n is number of moles
- Q is quantity of heat released
ΔH(fus) = 21.2 kJ / 1.42 mol
ΔH(fus) = 14.93 kJ/mol
From the table the substance with latent heat of fusion of 14.9 kJ/mol is iron.
Thus, the substance that releases 21.2 kJ of energy when 1.42 mol of it freezes is iron.
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- The oxidation state of the manganese atom
changes from +7 as in
to +4 as in
.
- There are one
ion.
- Reducing each
- Similarly, the oxidation state of the chlorine atom
changes from -1 as in
to 0 as in
.
- It takes two
- Oxidizing every two
Three molecules contain six chlorine atoms. Three
would thus correspond to six
ions.
Combining six , two
ions, three
ions, and two
would balance the changes in oxidation state.
(NOT BALANCED)
Still, the product side lacks four oxygen atoms.
- In an acidic environment, oxygen atoms would combine with protons to produce water.
- In a basic environment (like this one,) there are nearly no protons for oxygen atoms to combine with. Oxygen atoms will likely combine with water to produce hydroxide ions.
Each oxygen atom combine with a water molecule to produce two hydroxide ions. Adding four water molecules and eight hydroxide ions would balance the equation.