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
noname [10]
3 years ago
15

Calculate the standard enthalpy of formation of NOCl(g) at 25 ºC, knowing that the standard enthalpy of formation of NO(g) at th

at temperature is 90.25 kJ / mol, and that the standard molar enthalpy of the reaction 2 NOCl(g) → 2 NO(g) + Cl2(g) is 75.5 kJ / mol at the same temperature.
Chemistry
1 answer:
stepan [7]3 years ago
8 0

Answer:

The standard enthalpy of formation of NOCl(g) at 25 ºC is 105 kJ/mol

Explanation:

The ∆H (heat of reaction) of the combustion reaction is the heat that accompanies the entire reaction. For its calculation you must make the total sum of all the heats of the products and of the reagents affected by their stoichiometric coefficient (number of molecules of each compound that participates in the reaction) and finally subtract them:

Enthalpy of the reaction= ΔH = ∑Hproducts - ∑Hreactants

In this case, you have:  2 NOCl(g) → 2 NO(g) + Cl₂(g)

So, ΔH=2*H_{NO} +H_{Cl_{2} }-2*H_{NOCl}

Knowing:

  • ΔH= 75.5 kJ/mol
  • H_{NO}= 90.25 kJ/mol
  • H_{Cl_{2} }= 0 (For the formation of one mole of a pure element the heat of formation is 0, in this caseyou have as a pure compound  the chlorine Cl₂)
  • H_{NOCl}=?

Replacing:

75.5 kJ/mol=2* 90.25 kJ/mol + 0 - H_{NOCl}

Solving

-H_{NOCl}=75.5 kJ/mol - 2*90.25 kJ/mol

-H_{NOCl}=-105 kJ/mol

H_{NOCl}=105 kJ/mol

<u><em>The standard enthalpy of formation of NOCl(g) at 25 ºC is 105 kJ/mol</em></u>

You might be interested in
3. 25. The temperatures favorable for the growth of most bacteria are
kvasek [131]

B.

about the same as for humans

Explanation:

This is why most bacteria, during research in labs, are incubated at 37 degrees centigrade, about the same as human body temperature. In addition, harmful and beneficial bacteria thrive in the human body due to the favorable temperatures for growth and reproduction. To try and fight an infection, the body also tries to raise the body temperatures above the optimal for the bacteria  growth (the reason one has a fever in case of infection).

6 0
3 years ago
The SI base unit for mass is the gram. TRUE FALSE ​
Anni [7]
The answer is true the si base unit for mass is the gram
5 0
3 years ago
Read 2 more answers
Pls help and i will mark brainliest
myrzilka [38]

Answer:

No. 3 lithium

Explain that lithium has 3 protons and 3 electrons. There are 2 electrons on the first energy level and 1 electron on the second

No. 4 Hydrogen (H) and helium (He) have a valence shell containing one and two electrons respectively. They make up the first period (row) of the periodic table. Their valence electron/s are in the first energy level (n=1) , as is denoted by 1s1 and 1s2 .

<em>That</em><em>'</em><em>s</em><em> </em><em>all</em><em> </em><em>i</em><em> </em><em>dont</em><em> </em><em>know</em><em> </em><em>if</em><em> </em><em>this</em><em> </em><em>is</em><em> </em><em>right</em><em> </em><em>though</em><em>.</em><em> </em>

6 0
3 years ago
Read 2 more answers
Balance the equations by inserting coefficients as needed.
ASHA 777 [7]

Answer:

1.     CaCO3 + 2HCl → CaCl2 + H2O + CO2

2.    C6H12O2 + 8O2 → 6CO2 + 6H2O

Explanation:

7 0
3 years ago
Read 2 more answers
Potassium impart purple colour but beryllium do not impart any colour to the flame.Why?​
BaLLatris [955]

Answer:

<h2>The electrons in beryllium and magnesium are too strongly bound to get excited by flame. Hence, these elements do not impart any color.</h2>
6 0
3 years ago
Other questions:
  • What term matches this definition – negatively charged particle in an atom??
    15·1 answer
  • NaCl<br> Quantity of element
    13·2 answers
  • In what type of reaction or process does heat flow into the system?
    8·2 answers
  • Who were the terrorists that attacked the united states on September 11, 2001
    7·1 answer
  • Consider this equilibrium: COCl2(g) CO(g) + Cl2(g) Keq = 8.1 x 10-4. What is true for this system? [COCl2] &lt; [CO][Cl2] [COCl2
    6·2 answers
  • How many moles of NaOH are present in 25.0 mL of a 0.1000 M NaOH solution?
    6·2 answers
  • What is the gram formula mass of Fe(NO3)3
    10·1 answer
  • In which scenario is a chemical change occurring?
    7·2 answers
  • Branliest to correct answer
    12·1 answer
  • How many grams are in 0.220 mol of Ne?
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!