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
almond37 [142]
3 years ago
5

Consider the following intermediate chemical equations.

Chemistry
1 answer:
vfiekz [6]3 years ago
8 0

Answer:

-250.3kJ

Explanation:

Based in the reactions and using -<em>Hess's law-</em>:

(1) P₄(s) + 6 Cl₂(g) → 4PCl₃(g) ΔH₁ = -4439kJ

(2) 4PCl₅(g) → P₄(s) + 10Cl₂  ΔH₂ = 3438kJ

The sum of (1) + (2) is:

4PCl₅(g) → 4PCl₃(g) + 4 Cl₂ ΔH = -4439kJ + 3438kJ = -1001kJ

Dividing this reaction in 4:

PCl₅(g) → PCl₃(g) + Cl₂ ΔH = -1001kJ / 4 = <em>-250.3kJ</em>

You might be interested in
Enter the atomic symbol, including mass number and atomic number, for iodine-125.
ICE Princess25 [194]

Answer:

Explanation:

Iodine - 125

The atomic symbol of iodine is ¹²⁵₅₃ I

The symbol for iodine is I

The atomic number of iodine is 53,

and the atomic mass of iodine is 125 .

<u>The representation of the atomic symbol is as, the atomic mass is written in uppercase and the atomic number is written in lower case , followed by the symbol of the element .</u>

Iodine is a radio active element , used for many biological process .

It is the second largest -lived radioisotope of iodine .

The first is iodine-129 .

3 0
3 years ago
Put the steps of the scientific method into the correct order.
riadik2000 [5.3K]
<span>The scientific method is a systematic way of questioning about the world around us and answering questions. The number of steps varies from one description to another, mainly when data and analysis are separated into separate step, but this is a fairly standard list of 6 scientific method steps, which you are expected to know for any science class:

1. Form a Hypothesis. This is a sort of educated guess about what you expect. 
2. Design an Experiment to test your hypothesis. An experiment has an independent and dependent variable. You change or control the independent variable and record the effect it has on the dependent variable.
3. Conduct Experiment
4. Record data and observations and analyze what the data means. Often, you'll prepare a table or graph of the data.
5. Form a Conclusion. Conclude whether to accept or reject your hypothesis. Communicate your results.</span>
5 0
3 years ago
Read 2 more answers
Which of the following instruments has the highest pitch?<br> bass drum<br> flute<br> trombone
sweet [91]

Answer:

Flute

Explanation:

7 0
3 years ago
Read 2 more answers
What is reproduction
Zolol [24]
The action or process of making a copy of something.
3 0
3 years ago
Whats the main difference between a double replacement reaction and a single replacement
aivan3 [116]

Answer:

a single-replacement reaction replaces one element for another in a compound. A double-replacement reaction exchanges the cations, or the anions, of two ionic compounds.

7 0
3 years ago
Other questions:
  • What I said the molarity of an hcl solution if 24.0 ml is completely neutralized by 98.0 ml of 0.250m ca(oh)2
    10·1 answer
  • The rate constant for a certain reaction is measured at two different temperatures: temperature Assuming the rate constant obeys
    13·1 answer
  • Which element is found in nature only in compounds? A. sodium B. helium C. oxygen D. nitrogen
    11·2 answers
  • Classify each of the following as an element, a compound, a homogeneous mixture, or a heterogeneous mixture: (a) seawater, (b) h
    9·2 answers
  • Explain how one isotope of an element differs from another
    12·1 answer
  • What is the oxidation state of nitrogen in NaNO2?<br> (1) +1 (3) +3<br> (2) +2 (4) +4
    13·1 answer
  • g In the elimination reaction of t-butanol and t-butyl bromide. A. They have a common intermediate and require a strong base B.
    14·1 answer
  • Arrange He,Br2 and NaCl in increasing boiling point and explain why
    7·1 answer
  • How many electrons will each ele-
    14·1 answer
  • A gas with a pressure of 820.4 mmHg occupies a
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!