1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Lapatulllka [165]
3 years ago
11

Use the standard reaction enthalpies given below to determine ΔH°rxn for the following reactionP4(g) + 10 Cl2(g) → 4PCl5(s) ΔH°r

xn = ?Given:PCl5(s) → PCl3(g) + Cl2(g) ΔH°rxn = +157 kJP4(g) + 6 Cl2(g) → 4 PCl3(g) ΔH°rxn = -1207 kJ
Chemistry
1 answer:
weqwewe [10]3 years ago
5 0

Answer:

Therefore  \bigtriangledown H^\circ_{rxn}= -1835 KJ

Explanation:

Enthalpy is denoted by H.

Enthalpy: Total heat change in a chemical reaction is called enthalpy.

The change of entalpy of a reaction is denoted by \bigtriangledown H^\circ_{rxn}

Hass's Law:The change in enthalpy of any process can be determined by calculating the sum of change in enthalpy of each of the steps involved in the process.

g= gas

S= solid

P₄(g)+10Cl₂(g)→ 4Cl₅(s)       \bigtriangledown H^\circ_{rxn}=?

PCl₅(s)→ PCl₃(g)+Cl₂(g) .......(1)       \bigtriangledown H^\circ_{rxn}= +157KJ

P₄(g)+6Cl₂(g)→  4PCl₃(g).............(2)     \bigtriangledown H^\circ_{rxn}= -1207 KJ

If we flip a reaction the value of enthalpy will be change positive to negative or nagative to positive but the numerical value will be remain same.

We need rearrange the equation (1) because in the required equation Cl₂ is on the left side. So we flip the first equation.

PCl₃(g)+Cl₂(g)→PCl₅(s)......(3)          \bigtriangledown H^\circ_{rxn}= -157KJ

Multiplying 4 with equation (3)

4 PCl₃(g)+4Cl₂(g)→4PCl₅(s)......(4)          \bigtriangledown H^\circ_{rxn}=4×( -157)KJ= -628 KJ

Adding equation (2) and (4) we get

P₄(g)+6Cl₂(g)+4 PCl₃(g)+4Cl₂(g)→4PCl₃(g)+4PCl₅(s)    \bigtriangledown H^\circ_{rxn}=( -1207-628)KJ

⇒P₄(g)+10Cl₂(g)→4PCl₃(g)-4PCl₃(g)+4PCl₅(s)      \bigtriangledown H^\circ_{rxn}= - 1835KJ

⇒P₄(g)+10Cl₂(g)→ 4Cl₅(s)       \bigtriangledown H^\circ_{rxn}= -1835 KJ

Therefore  \bigtriangledown H^\circ_{rxn}= -1835 KJ

You might be interested in
*blank* carry blood away from the heart, while *blank* carry blood back to the heart.
worty [1.4K]

Answer:

i think its C im not so sure

Explanation:

nrjdkfkzhsugogo

5 0
3 years ago
The following reaction has an activation energy of 262 kJ/mol.
Hitman42 [59]

Answer: i really       dont know srry

Explanation:

4 0
3 years ago
Although _________________ are clearly dangerous psychoactive chemicals-drugs-semantic fiction portrays them otherwise.
LekaFEV [45]
The answers the best fit the blank provided above are the terms NICOTINE and ALCOHOL. This is related to the discussion above Drug use and abuse. Both of these results in clearly dangerous psychoactive chemicals. Hope this answers your question. Have a great day!
5 0
3 years ago
Analysis of a metal salt CrX3 shows it contains 32.84% cr by mass. What is molar mass of x.
zysi [14]

Answer:

35.4451011

Explanation:

6 0
3 years ago
Difference between fluids and nonfluids
Mamont248 [21]

Answer:

All liquids are fluids but not all fluids are liquids. Fluids basically describe anything that can flow as a result of a difference in pressure between two points. Liquids on the other hand are a subset of fluids. Liquids are the incompressible fluids. These are the fluids who's density does not change sharply with pressure.

Gases are also fluids, they form the compressible fluids. They do flow as a result of difference in pressure between two points but at the same time they can be compressed or expanded. Their density fluctuates with pressure.

Hence fluids consist of 2 mutually exclusive groups of compressible and incompressible fluids. Liquids are the incompressible fluids and hence form a subset of the more general term fluid.

5 0
3 years ago
Other questions:
  • What is the name of this alkane?
    5·2 answers
  • Help I need to finish my chemistry report.
    9·1 answer
  • Four students wrote different analogies to describe an electron before the formation of an ionic bond.
    8·2 answers
  • In 1906, a 600 g diamond was found at the Premier Mine in South Africa- the world's largest uncut diamond. Suppose the diamond's
    13·1 answer
  • Earth's seasons occur due to the tilt of the earth and it's revolution around the sun.
    13·1 answer
  • Please help its difficult
    15·1 answer
  • A block of iron has a mass of 826 g. What is the volume of the block of iron whose density at 25°C is 7.9 ?
    7·1 answer
  • Select the response(s) below that correctly describe(s) part of the process by which elements combine to form ionic compounds.
    15·1 answer
  • Help please first person to get it right gets my old Netflix account​
    9·2 answers
  • What is the frequency of the green light emitted by a hydrogen atom with a wavelength of 525 nm?
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!