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3 years ago

According to Table I, which equation represents a change resulting in the greatest quantity of energy released?

2 answers:

8 0

The answer is 3. The releasing of energy means exothermic reaction. So the ΔH should be negative. And the greatest quantity of energy released means that the greatest number. So according to the table I, the answer is 3.

Leni [432]3 years ago

6 0

Answer:

3. N2(g) +3H2(g)->2NH3(g)

Explanation:

Reactions can be broadly classified as endothermic and exothermic reactions. In the former, energy or heat is absorbed by the reactants and the enthalpy change of the reaction is positive. In the later, heat is released ans the enthalpy change of the reaction is negative.

For the given reactions, the enthalpy change or ΔH values are:

1. 2C(s) + 2H2(g) -> C2H4(g) ΔH = +52.4 kJ

2. 2C(s)+3H2(g) -> C2H6(g) ΔH = -84 kj

3. N2(g) +3H2(g)->2NH3(g) ΔH = -91.8 kJ

4. N2(g)+O2(g) -> 2NO(g) ΔH = +182.6 kJ

Reactions 1 and 4 are endothermic while reactions 2 and 3 are exothermic in which heat is released.

More negative the ΔH value, greater is the amount of heat released.

Thus, reaction 3, represents a change resulting in the greatest quantity of energy released

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Heredity is best described as the

sertanlavr [38]

Answer:

The process by which organisms pass genetic traits on to their offspring.

Explanation:

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3 years ago

Find the volume of a gas at standard pressure if its volume at 1.9 atm is 80 ml?

kogti [31]

Answer:

1.5 × 10² mL

Explanation:

Step 1: Given data

Initial pressure of the gas (P₁): 1.9 atm

Initial volume of the gas (V₁): 80 mL

Final pressure of the gas (P₂): 1.0 atm (standard pressure)

Final volume of the gas (V₂): ?

Step 2: Calculate the final volume of the gas

For an ideal gas, we can calculate the final volume of the gas using Boyle's law.

P₁ × V₁ = P₂ × V₂

V₂ = P₁ × V₁/P₂

V₂ = 1.9 atm × 80 mL/1.0 atm

V₂ = 1.5 × 10² mL

Since the pressure decreased, the volume of the gas increased.

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2 years ago

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Nesterboy [21]

I think the answer is D

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3 years ago

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3 years ago

Chemistry! Help! Please!! Thanks

Vladimir79 [104]

Answers:

1. 3-ethyl-3-methylheptane; 2. 2,2,3,3-tetramethylpentane; 3. hexa-2,4-diene.

Explanation:

Structure 1

Identify and name the longest continuous chain of carbon atoms (the main chain has 7 C; ∴ base name = heptane).
Identify and name all the substituents [a 1C substituent (methyl) and a 2C substituent (methyl).
Number the main chain from the end closest to a substituent.
Identify the substituents by the number of the C atom on the main chain. Use hyphens between letters and numbers (3-methyl, 3-ethyl).
Put the names of the substituents in alphabetical order in front of the base name with no spaces (3-ethyl-3-methylheptane)

Structure 2

5C. Base name = pentane
Four methyl groups.
Number from the left-hand end.
If there is more than one substituent of the same type, identify each substituent by its locating number and use a multiplying prefix to show the number of each substituent. Use commas between numbers (2,2,3,3-tetramethyl).
The name is 2,2,3,3-tetramethylpentane.

Structure 3

Identify and name the longest continuous chain of carbon atoms that passes through as many double bonds as possible. Drop the -ne ending of the alkane to get the root name hexa-.
(No substituents).
Number the main chain from the end closest to a double bond.
If there is more than one double bond use a multiplying prefix to indicate the number of double bonds (two double bonds = diene) and use the smaller of the two numbers of the C=C atoms as the double bond locators (2,4-diene)
Put the functional group name at the end of the root name (hexa-2,4-diene).

Note: The name 2,4-hexadiene is acceptable, but the Preferred IUPAC Name puts the locating numbers as close as possible in front of the groups they locate.

7 0

3 years ago