Answer:
-252.5 kJ/mol = ΔH H2O(g)
Explanation:
ΔH Fe2O3 = -825.5kJ/mol
ΔH H2 = 0kJ/mol
ΔH Fe = 0kJ/mol
Based on Hess's law, ΔH of a reaction is the sum of ΔH of products - ΔH of reactants. For the reaction:
Fe2O3(s) + 3 H2(g) →2Fe(s) + 3 H2O(g)
ΔHr = 67.9kJ/mol = 3*ΔH H2O + 2*ΔHFe - (ΔH Fe2O3 + 3*Δ H2)
67.9kJ/mol = 3*ΔH H2O + 2*0kJ/mol - (ΔH -825.5kJ/mol + 3*Δ H2)
67.9 = 3*ΔH H2O(g) + 825.5kJ/mol
-757.6kJ/mol = 3*ΔH H2O(g)
<h3>-252.5 kJ/mol = ΔH H2O(g)</h3>
Answer : The molar specific heat of Ni is, 
Explanation :
In this problem we assumed that heat given by the hot body is equal to the heat taken by the cold body.
where,
= specific heat of Ni = ?
= specific heat of water = 
= mass of Ni = 1000 g
= mass of water = 1 kg = 1000 g
= final temperature of water = 
= initial temperature of Ni = 
= initial temperature of water = 
Now put all the given values in the above formula, we get
Now we have to calculate the molar specific heat of Ni.
Therefore, the molar specific heat of Ni is,
Answer: An air mass that originates over land in Central America is most likely<em><u> warm & dry.</u></em>
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