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3 years ago

For which one of the following reactions is the value of ΔH°rxn equal to ΔH°f for the product?

Chemistry

1 answer:

noname [10]3 years ago

8 0

Answer:

The reaction D has the value of ΔH°rxn equal to ΔH°f for the product.

Explanation:

The ΔH°f for product is equal to ΔH°rxn when the reagents are in their elemental state (ΔH°f = 0) and form one mole of product.

We have to find the reagents that are in their elemental state and that only form one mole of product:

A) 2Ca (s) + O₂ (g) → 2CaO (s)

The reagents are in their elemental state but the reaction forms two mole of product.

B) C₂H₂ (g) + H₂ (g) → C₂H₄ (g)

C₂H₂ (g) is not in its elemental state.

C) 2C (graphite) + O₂ (g) → 2CO (g)

Graphite and Oxygen are in their elemental state but the reaction forms two mole of product.

D) 3Mg (s) + N₂ (g) → Mg₃N₂ (s)

Magnesium and Nytrogen are in their elemental state and the reaction forms one mole of product.

E) C (diamond) + O₂ (g) → CO₂ (g)

Diamond is not in its elemental state.

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Convert rate of 271.7 gallons/min to an equivalent rate of cL/week. Present answer in scientific notation rounded to the proper

Dafna11 [192]

Answer:

Convert the rate of 271.7 gallons/min to an equivalent rate of cL/week. Present your answer in scientific notation rounded to the proper number of sig figs.

Explanation:

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3 years ago

What is the mole ratio of NH3 to N2?

Ksenya-84 [330]

To answer this question a balanced chemical equation is necessary. The correct equation is: N2 + 3H2 = 2NH3
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3 years ago

Doing a crossword puzzle on ionic bonds. "Metals are usually _____ of electrons."<br> 6 letters

zhannawk [14.2K]

Metals are usually givers of electrons.

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3 years ago

Given the reaction:<br> C2H2 + 2H2 → C2H6<br> This reaction represents

jeyben [28]

<h2>Given reaction: </h2><h2>C2H2 + 2H2 → C2H6 </h2><h2>This reaction represents: Combination reaction </h2>

Explanation:

When two or more substances react and form some new substance it is called as chemical reaction .

A + B --> C + D

(reactants ) (products )

Types of chemical reaction

we come across different types of reactions that occur in nature .

Out of them , combination is also one type

Combination reaction

It is a reaction ,when two or more reactants react to form single product .

i.e A+B-----AB(IN THIS ONE SINGLE PRODUCT IS FORMED )

This reaction can be between element element , element compound or compound compound .

LIKE : H₂+Cl₂------HCL

(E) (E) (PRODUCT )

SO₂+O₂----SO₃

CO₂+H₂O----H₂CO₃

In the above asked equation :

C₂H₂ + 2 H₂ --> C₂H₆

The ethane is formed by combination reaction
This reaction obeys law of conservation of mass as it is balanced .

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3 years ago

Water alone does not easily remove grease from dishes or hands because grease is nonpolar and water is polar. The addition of so

rewona [7]

Answer:

Micelle Formation

Explanation:

The soap molecule has a nonpolar and a polar cationic end when it is dissolved in water. When it dissolves in water, the sodium stearate congregates to form small spheres (called micelles) with the on the inside and the on the surface. The anionic end can attract and interacts with the polar water molecules, while the interact with the nonpolar grease. This allows the soapy water to remove the grease by trapping the grease inside the micelle.

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3 years ago