When the following equation is balanced, the coefficient of H2O is Ca(s) + H2O + Ca(OH)2 + H2 a) 2
1 answer:
Answer:
Explanation:
Given:
In a balanced chemical equation, the number of atoms of each element are equal on both sides.
No. of atoms of Ca in left hand side = 1
No. of atoms of Ca in right hand side = 1
So, no. of atoms of Ca is balanced
Now,
No. of atoms of O in left hand side = 1
No. of atoms of O in right hand side = 2
Now multiply H2O with 2
No. of atoms of O are balanced on each side
No. of atoms of H in left hand side = 4
No. of atoms of H in right hand side = 4
Now, each element is balanced
So coefficient of H2O after balancing = 2
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Answer:
1. Exothermic.
2. -1598 kJ.
Explanation:
Hello!
1. In this case, according to the reaction, we can infer that 799 kJ of energy are evolved (given off, released) it means that the enthalpy of reaction is negative as the reactants have more energy than the products; which means this is an exothermic reaction.
2. Here, as we know that the enthalpy of reaction is -799 kJ/mol, we can compute the q-value as shown below, considering the reacted 2 moles of solid iron:
Which means that 1598 kJ of energy are evolved when 2 moles of solid iron react.
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