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
DaniilM [7]
3 years ago
5

Using the bond energies provided below, calculate ?H° for the reaction

Chemistry
1 answer:
shusha [124]3 years ago
8 0

Answer:

ΔHºrxn =  - 440 kJ

Explanation:

What we need to remember in this question is that given the bond energies for a reaction, the enthalpy change , ΔHº , is given by the expression:

ΔHºrxn = ∑ energies of the bonds broken   - ∑ energies of the bonds formed.

where s  ∑ is  summatory.

The reaction is CH₄(g) + 4 Cl₂(g) ⇒ CCl₄(g) + 4 HCl(g)

So lets make the inventory of the bond broken and bonds formed

Bonds Broken:

4 C-H = 4 mol (413 kJ/mol ) = 1652 kJ

4 Cl-Cl = 4 mol ( 243 kJ/mol = 972 kJ/mol

Bond Formed:

4 C-Cl = 4 mol (339 kJ/mol ) = 1356 kJ

4 H-Cl = 4 mol (427 kJ/mol ) = 1708 kJ

Now we can calculate  ΔHºrxn :

ΔHºrxn = ∑ energies of the bonds broken   - ∑ energies of the bonds formed

ΔHºrxn = ( 1652 + 972 ) kJ   - ( 1356 + 1708 ) kJ

            = 2624 kj  - 3064 kJ

            = - 440 kJ

You might be interested in
Ni is the symbol for what element?
nignag [31]
Ni is for Nitrogen.
7 0
3 years ago
Read 2 more answers
Liquids boil when:
Inessa05 [86]

Answer:

A, Vapor pressure is very high

5 0
3 years ago
Read 2 more answers
250 kJ of energy are removed from a 4.00 x 102 g sample of water at 60˚C. Will the sample of water completely freeze?
Stolb23 [73]

250 kJ of energy are removed from a 4.00 x 102 g sample of water at 60˚C. Will the sample of water completely freeze: Yes, because there is enough energy.

<h3>At what temperature would a sample of water freeze?</h3>
  • Note from the Facilitator: At certain temperatures, water changes its condition due to temperature variations. At sea level, fresh water changes from a solid to a liquid at 32°F (0°C). Liquid water freezes at temperatures below 32°F (0°C); this temperature is known as the freezing point of water.
  • The fact that a single water molecule cannot transform into a solid, liquid, or gas is the answer. These names refer to collective behaviors of water molecules rather than to individual molecules.
  • For instance, the solid (ice) has a collection of molecules that are bound together and arranged in a predictable manner. That cannot be accomplished by a single molecule alone

250 kJ of energy are removed from a 4.00 x 102 g sample of water at 60˚C. Will the sample of water completely freeze: Yes, because there is enough energy.

To learn more about water freezing, refer to:

brainly.com/question/15209660

#SPJ9

5 0
2 years ago
The initial temperature of a 1.00 liter sample of argon is 20 Celsius. The pressure is decreased from 720 mm Hg to 360 mm Hg and
Rasek [7]

Answer:314k

Explanation:

4 0
3 years ago
If i combined 15.0 grams of calcium hydroxide with 75.0 ml of 0.500 m hcl, how many grams of calcium chloride would be formed?
Zina [86]
The equation is:
Ca(OH)₂(s) + 2 HCl(aq) → CaCl₂(aq) + 2 H₂<span>O(l)
</span>

n=mass in g/M.M

15 g Ca(OH)₂ is n=15 g/ 74.1 g/mol=0.2024 mol of Ca(OH)₂

no. of mol of HCl:

n=0.5 mol/L*0.075L=0.0375 mol

This could react with 0.0375/2= 0.01875 mol of Ca(OH)₂ We have a lot more than that.

Therefore, HCl is the limiting reagent and determines how much CaCl₂ forms.

Based on the balanced reaction, 2 moles of HCl gives 1 mole of CaCl₂

no. of mol of CaCl₂= 0.0375/2= 0.01875 mol

mass in g=n*MM= 0.01875*111= 2.08 g

7 0
3 years ago
Other questions:
  • This is basic chemistry btw.<br> screen shoted it
    14·1 answer
  • Investigators studying a particular cell response are curious about what type of cell-surface receptor might trigger it. They in
    12·1 answer
  • Can someone please explain this to me? I need help ​
    11·2 answers
  • Determine the minimum work required by an air compressor. At the inlet the conditions are 150 kg/min, 125 kPa and 33 °C. At the
    15·1 answer
  • The energy level where an electron is located, is shown by the ______ on the periodic table
    14·1 answer
  • If 35.0 mL of water in a graduated cylinder is displaced by 8.00 mL
    15·1 answer
  • A que llamamos niveles y subniveles de energia?
    7·1 answer
  • PLS HELP ME WITN THIS ILL GIVE BRAINLIEST
    6·1 answer
  • Help me in my this plzzz ​
    8·2 answers
  • To determine the specific heat capacity of copper, Alyssa performed an investigation by which she dropped a heated piece of copp
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!