Question

for which one of the following substance delta h is zero
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Answer 1

for which one of the following substance delta h is zero

A. Ca(s)

B. He (g)

C. P (red)

D. $CH_{3} OH$(l)

Answer:

The correct option is D. $CH_{3} OH$

Explanation:

• The Elements' Standard States. Solid, liquid, or gas are the three states of all chemical compounds. The chemistry community has settled on a concept known as "the standard state" to facilitate comparisons. A chemical substance's phase (solid, liquid, or gas) at 25 °C and one atmosphere of pressure are considered to be its standard state. Due to the fact that there is no change during production, all elements have a standard enthalpy of formation of zero.
• We discover Ca(s), He(g), and P(red) in their normal states. Their delta H is therefore zero.
• A series of chemical processes result in the formation of $CH_{3} OH$. Thus, delta H for the heat of formation is not zero.

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Answer 2

Answer:

for which one of the following substance delta h is zero

A. Ca(s)

B. He (g)

C. P (red)

D.CH3OH (l)

D.CH3OH (l) Is the correct answer of this question.

Explanation: D.CH3OH (l)

The Standard States of the Elements. All chemical substances can exist in one of three states: solid, liquid, or gas. To enable comparisons, the chemical community has chosen the idea of "the standard state." At 25 °C and one atmosphere of pressure, the phase (solid, liquid, or gas) of a chemical compound is regarded as the standard state. All elements have a standard enthalpy of formation of zero since there is no change throughout the creation process.

Ca(s), He(g), and P(red) are found in their natural states. Therefore, their delta H is zero.

The creation of is the outcome of many chemical reactions. The heat of formation's delta H is thus not zero.

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