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
Bess [88]
3 years ago
8

Research is being carried out on cellulose as a source of chemicals for the production of fibers, coatings, and plastics. Cellul

ose consists of long chains of glucose molecules (C6H12O6), so for the purposes of modeling the reaction we can consider the conversion of glucose to formaldehyde (H2CO).
1. Calculate the heat of reaction for the conversion of 1 mole of glucose into formaldehyde, given the following thermochemical data:
H2CO(g) + O2(g) -------> CO2(g) + H2O(g) ΔH °comb = - 572.9 KJ/mol
6 C(s) + 6 H2(g) + 3 O2(g) -------> C6H12O6(s) ΔH ° f = - 1274.4 KJ/mol
C(s) + O2(g) ---------> CO2(g) ΔH ° f = - 393.5 KJ/mol
H2(g) + 1 / 2 O2(g) -----------> H2O(g) ΔH ° f = - 285.8 KJ/mol
C6H12O6(s) ---------> 6 H2CO(g) ΔH ° rxn = ?
Chemistry
1 answer:
Luden [163]3 years ago
8 0

Answer:

+ 636 KJ

Explanation:

We want to arrive to the equation

C6H12O6(s) ---------> 6 H2CO(g) ΔH ° rxn = ?

by manipulating algebraically the first four  given equations.

We notice the first one has our product H2CO(g) as a reactant. This indicates we must take the inverse of that equation. Also we need 6 mol of H2CO(g), thus it also needs to be multiplied by 6

6 CO2(g) + 6 H2O(g)  ------->6H2CO(g) + 6O2(g)  ΔH °comb = + 572.9 KJ/x 6

Now we want C6H12O6(s) as a reactant and it  is a product in the second one, therefore lets reverse it

C6H12O6(s)  -------> 6 C(s) + 6 H2(g) + 3 O2(g)   ΔH ° f = + 1274.4 KJ/mol

Now if take the third equation and multiply it by six we will cancel the C(s) with the above equation

6 C(s) + 6O2(g) ---------> 6 CO2(g) ΔH ° f = - 393.5 KJ/mol x 6

Finally by multiplying the last equation by 6 and adding all the equations we will arrive at our desired one

6 H2(g) + 3 O2(g) -----------> 6H2O(g) ΔH ° f = - 285.8 KJ/mol x 6

then lets add them to get ΔH ° rxn:

  6 CO2(g) + 6 H2O(g)  ------->6H2CO(g) + 6O2(g)  ΔH °comb = + 3437.4 KJ

+ C6H12O6(s)  -------> 6 C(s) + 6 H2(g) + 3 O2(g)      ΔH ° f = + 1274.4 KJ

+ 6C(s) + 6O2(g) ---------> 6 CO2(g)                            ΔH ° f = - 2361.0 KJ

+6 H2(g) + 3 O2(g) -----------> 6H2O(g)                      ΔHº f  = - 1714.8 KJ

<u>                                                                                                                            </u>

C6H12O6(s) ---------> 6 H2CO(g)  

ΔH ° rxn =  3437.4 + 1274.4 - 2361.0 - 1714.8 =  636 KJ

You might be interested in
DUE IN 30 MINUTES!!! (please keep it short if you can, if not its ok.) What is the molar mass of Pb(SO4)2? Explain how you calcu
kipiarov [429]

Answer:

399

Explanation:

Pb(SO4)2 contains 1 atom of Pb, 2 atoms of S and 8 atoms of O. So, atomic mass of Pb(SO4)2 is 207 + 64 + 128 = 399 u. Therefore, molar mass of Pb(SO4)2 is 399 g/mol.HOPE THIS helps. Good Luck

5 0
3 years ago
Read 2 more answers
How many atoms of hydrogen are present in 7.63 g of ammonia? please help me ??
GarryVolchara [31]
The atoms  of  hydrogen  that are  present  in  7.63 g  of ammonia(NH3)

find  the  moles  of NH3 =mass/molar mass
 7.63 g/ 17 g/mol = 0.449  moles

since there  is  3 atoms of H  in NH3 the  moles of  H = 0.449 x 3 = 1.347 moles

by  use  of  1 mole = 6.02 x10^23  atoms
what  about  1.347  moles

= 1.347  moles/1   moles  x 6.02 x10^23 atoms = 8.11 x10^23  atoms of Hydrogen
3 0
3 years ago
Question 8 (10 points)
I am Lyosha [343]

Answer:

positively charged elctrons

4 0
3 years ago
Read 2 more answers
Some people rinse their freshly shampooed hair in diluted lemon juice or vinegar. Why is this done?​
zzz [600]

Answer:

the citric acid in lemon juice is a natural bleach, or oxidizing agent. It whitens hair by chemically reducing your hair's color pigment, or melanin. When exposed to the sun, the citric acid accelerates the bleaching process

8 0
3 years ago
Read 2 more answers
C5H6 reacts with itself to form C10H12 according to the following process
swat32
When carbon compounds react with themselves to form a larger molecule the process is called polymerization. Specifically addition polymerization. sometimes molecules containing containing carbon to carbon double bonds can join together to form longer chains. The double bond is broken and the electrons in it join to neighboring molecules. 
4 0
3 years ago
Other questions:
  • While performing the Acid-catalyzed Hydrolysis of Epoxides experiment you used a solution containing 1.84 mL of cyclohexene oxid
    12·1 answer
  • Which of the following types of molecules always has a dipole moment? Linear molecules with two identical bonds. Trigonal pyrami
    5·1 answer
  • Why ammonia has high bond angle than water
    15·1 answer
  • Each phase of matter can be described according to the relative amount of intermolecular forces (IF) holding the molecules toget
    14·1 answer
  • The atoms of a certain element each contain 19 protons and 1 valence electron. Which statement correctly identifies this element
    12·1 answer
  • When is International coffee day?
    13·1 answer
  • The density of a substance is 1.63 grams per milliliter. What is the mass of 0.25 liters of the substance in grams?
    8·1 answer
  • Why are the discrete lines observed and not a continuous spectrum?​
    14·1 answer
  • 15. If the moon is 384,400km away. Does it take more than a second for light to travel from the Earth to the moon?​
    14·1 answer
  • What is occurring in the image below?
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!