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Vitek1552 [10]
3 years ago
5

Do you agree or disagree for each one of them and provide evidence why??​

Chemistry
1 answer:
sergiy2304 [10]3 years ago
6 0

Answer:

Disagree

Agree

Agree

Disagree

Explanation:

A chemical change is one in which a new kind of substance is formed. It is always accompanied by energy changes.

  • It is wrong to assert that all chemical changes are dangerous. In our body system, chemical changes are constantly happening.
  • Chemical changes shows the law of conservation of mass in that the amount of reactants and products are always the same.
  • Chemical reactions occur when two substances are chemically combined together.
  • Not all dissolution reaction are chemical changes. For example, when sugar dissolves in water, it is not a chemical change.
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Answer:

72.6 mL

Explanation:

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3 years ago
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The formation of ammonia is represented by the equation N2(g) + 3H2(g) ⇌ 2NH3(g). Determine the enthalpy of formation of ammonia
Savatey [412]

Answer:

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Explanation:

Hello!

In this case, since the study of the bond energy allows us to compute the enthalpies of some reactions, for this combination reaction by which ammonia is yielded, we understand the enthalpy of reaction equals the enthalpy of formation of ammonia, and, in terms of the bonds energy we can write:

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Whereas the bonds enthalpy of those bonds that get broken cover the N≡N and the three H-H bonds at the reactants side and the enthalpy of those bonds that are formed cover the six N-H bonds at the products; which means we obtain:

\Delta _fH_{NH_3}=942\frac{kJ}{mol} +3*436\frac{kJ}{mol}-6*386\frac{kJ}{mol}\\\\\Delta _fH_{NH_3}=-66\frac{kJ}{mol}

Which differs from the theoretical value that is -46 kJ/mol.

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