Answer:
Explanation:
It is possible to answer this question knowing Hess's law that says you can sum half-reactions enthalpy cahnge to obtain enthalpy change of the total reaction. Using the reactions:
<em>(1) </em>2NO(g) → N₂(g)+O₂(g) ΔH = -180,6 kJ
<em>(2) </em>N₂(g) + O₂(g) + Cl₂(g) → 2NOCl(g) ΔH = +103,4 kJ
The reverse reactions of (1) and (2) are:
<u>N₂(g)+O₂(g)</u> → 2NO(g) ΔH = +180,6 kJ
2NOCl(g) → <u>N₂(g) + O₂(g)</u> + Cl₂(g) ΔH = -103,4 kJ
The sum of these reactions is:
2NOCl(g) → 2NO(g) + Cl₂(g) ΔH = +180,6 kJ -103,4 kJ = <em>77,2 kJ</em>
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I hope it helps!
D. There is one atom of sulfur and three atoms of oxygen.
The "tri" in trioxide indicates three so there are three atoms of oxygen. As nothing is said about the sulfur, there is just one atom.
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Answer:
-Being in the service of quality, safety, designing and problem solving.
-It plays an importnat part in our lives too, to measure any surface, object, etc.
Explanation:
Measurement is perhaps one of the most fundamental concepts in science. Without the ability to measure, it would be difficult for scientists to conduct experiments or form theories.
Based on the final state, the statement which is true about the substances in the petri dishes is that: D. The final substance in Petri dish C is a mixture and in Petri dish D is a pure substance.
<h3>What is a mixture?</h3>
A mixture can be defined as a combination of two (2) or more substances which are present in varied proportion (unfixed ratios). Also, a mixture can be visibly seen with our na-ked eyes and separated by physical means.
<h3>What is a
pure substance?</h3>
A pure substance can be defined as a single sample of matter that cannot be separated into other kinds of matter through the use of any physical separating technique because it has distinct chemical properties and a definite and constant composition.
In this context, we can reasonably infer and logically deduce that based on the final state, the statement which is true about the substances in the petri dishes is that the final substance in Petri dish C is a mixture while the final substance in Petri dish D is a pure substance.
Read more on pure substance here: brainly.com/question/14495350
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Complete Question:
The contents of two petri dishes are described in the table. Based on the final state, which statement is true about the substances in the petri dishes?
A. The final substances in both petri dishes are mixtures.
B. The final substances in both petri dishes are pure substances.
C. The final substance in Petri dish C is a pure substance and in Petri dish D is a mixture.
D. The final substance in Petri dish C is a mixture and in Petri dish D is a pure substance.
<span>The periods of rotation are much shorter than that of the Earth, and as such, their "days" are shorter. However, their periods of revolution are much longer than that of the Earth, due to having to traverse a much greater distance compared to Earth.</span>