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Ber [7]
3 years ago
11

From the following enthalpy changes,

Chemistry
1 answer:
AfilCa [17]3 years ago
5 0

Answer:

∆H = -763kJ

Explanation:

Using Hess's law we can determine the ΔH of a reaction from the sum of similar reactions. Using the reactions:

<em>(1) </em>2PCl3(l) → 2P(s) + 3Cl2(g) ∆H = -640 kJ

<em>(2) </em>2P(s) + 5Cl2(g) → 2PCl5(s) ∆H = -886 kJ

The sum of (1)/2 + (2)/2 gives:

(1) / 2 = PCl3(l) → P(s) + 3/2Cl2(g) ∆H = -640 kJ/2 = -320kJ

(2) / 2 = P(s) + 5/2Cl2(g) → PCl5(s) ∆H = -886 kJ/2 = -443kJ

PCl3(l) + Cl2(g) → PCl5(s) ∆H = -320kJ - 443kJ =

<h3>∆H = -763kJ </h3>

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3 years ago
From goal line to goal line, a football field is 300 ft long. If a player catches the ball while standing on one goal line, runs
KATRIN_1 [288]

Answer:

The player ran 91.44m.

Explanation:

The problem gives you the total distance between goal line to goal line in feet, and the answer must be given in meters, so you should convert the distance the player run from ft to m, because the player run the same distance from goal line to goal line to scores the touchdown.

So, you should apply the following conversion factor:

300ft*\frac{0.3048m}{1ft}= 91.44m

The player ran 91.44m.

3 0
3 years ago
16. Which element has th17. Magnesium, Mg, tends to form a +2 ion. Which will have the larger atomic radius? Mg or Mg2+ (Explain
SashulF [63]

Answer:

Th is the symbol for element Thorium.

Mg is magnesium while Mg 2+ is magnesium Ion. Judging from periodic trends, atomic radius is one half the distance between the atoms of two covalently bonded atoms. It decreases as elevtrons are added to valence shells. That means, across the period it increases and down the group it decreases. Making Mg2+ smaller.

Electronegativity is the energy needed to take an electron in the gaseous state. Florine is more electron negative that lithium. It increases across the period and decreases down the group. Except in the Noble group.

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6 0
3 years ago
Animals inherit traits from their parents. They pass some of these same traits on to their children. Suppose a pair of animals h
Fantom [35]

Answer:

A. The children will be more likely to survive than if they did not have the trait.

Explanation:

Process of elimination

B. It will not affect the children.

Cannot be true, if it didn't impact the children then how would survival of the fittest work?

D. The children will be able to adapt if the environment changes.

That just... not how adapting works when it comes to evolution.

C. The children will be more likely to survive than their parents were

Everyone has the same trait, everyone is equal in that regard.

A. The children will be more likely to survive than if they did not have the trait.

"Suppose a pair of animals has a trait that helps them survive in their environment." The trait helps them survive. Not having the trait makes them less likely to survive. A is correct

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2 years ago
Suppose you have a mixture of solid mg(oh)2 and baso4, how do you separate the mixture
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This separation technique is a 4-step procedure. First, add H₂SO₄ to the solution. Because of common ion effect, BaSO₄ will not react, only Mg(OH)₂.

Mg(OH)₂ + H₂SO₄ → MgSO₄ + 2 H₂O

The aqueous solution will now contain MgSO₄ and BaSO₄. Unlike BaSO₄, MgSO₄ is soluble in water. So, you filter out the solution. You can set aside the BaSO₄ on the filter paper. To retrieve Mg(OH)₂, add NaOH.

MgSO₄ + 2 NaOH = Mg(OH)₂ + Na₂SO₄

Na₂SO₄ is soluble in water, while Mg(OH)₂ is not. Filter this solution again. The Mg(OH)₂ is retrieved in solid form on the filter paper.
5 0
3 years ago
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