Answer:
- 386.6 kJ/mol.
Explanation:
- To solve this problem, we can use Hess's Law:
<em>ΔHrxn = ΣΔHf(products) - ΣΔHf(reactants) </em>
<em></em>
- For this reaction: <em>Ca(s)+ 2H₂O(l) → Ca(OH)₂(s) + H₂(g)</em>,
<em>∴ ΔHrxn = ΣΔHf(products) - ΣΔHf(reactants) = [ΔHf(Ca(OH)₂(s)) + ΔHf(H₂)(g)] - [ΔHf(Ca)(s) + 2*ΔHf(H₂O)(l)].</em>
ΔHf(Ca(OH)₂(s)) = - 985.2 kJ/mol, ΔHf(H₂)(g) = 0.0 kJ/mol, ΔHf(Ca)(s) = 0.0 kJ/mol, ΔHf(H₂O)(l) = - 285.8 kJ/mol.
<em>∴ ΔHrxn = ΣΔHf(products) - ΣΔHf(reactants) = [ΔHf(Ca(OH)₂(s)) + ΔHf(H₂)(g)] - [ΔHf(Ca)(s) + 2*ΔHf(H₂O)(l)] </em>= [(- 985.2 kJ/mol) + (0.0 kJ/mol)] - [(0.0 kJ/mol) + 2*(- 285.8 kJ/mol)] = <em>- 386.6 kJ/mol.</em>
Answer:
Commensalism is a symbiotic relationship in which one species benefits while the other species is not affected. One species typically uses the other for a purpose other than food.
Both derive from H20, one is agitated molecules from being heated up. The other molecules are slowed down by being cooled.
Number 1:
B.) 2,1,1,1
Number 2:
A.) 2,3,2
Number 3:
C.)1,5,2