Classify the following reaction: 2H2O 2H2 + O2

Chemistry

2 answers:

Likurg_2 [28]3 years ago

6 0

Synthesis i do believe

strojnjashka [21]3 years ago

5 0

The answer is: C. decomposition.

Decomposition is reaction where one substance is broken down into two or more simpler substances.

Balanced chemical reaction of water decomposition: 2H₂O → 2H₂ + O₂.

This is decomposition reaction, because from one molecule (water) two molecules (hydrogen and oxygen) are produced.

Chemical decomposition is opposite of chemical synthesis.

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When 2 moles of Fe(s) react with Cl2(g) to form FeCl3(s) according to the following equation, 799 kJ of energy are evolved.

GenaCL600 [577]

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:

$q=2mol*-799 kJ/mol\\\\q=-1598kJ$

Which means that 1598 kJ of energy are evolved when 2 moles of solid iron react.

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