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
solong [7]
3 years ago
9

Hydrazine (N2H4) is used as a rocket fuel. The combustion products are nitrogen (N2) and water (H2O). Use the following informat

ion about bond energies to estimate the change in enthalpy associated with the combustion of 1 mol of hydrazine
Bond Bond Energy (kJ/mol)

N–N 163

N=N 418

N N 941 <- triple bond

N–H 388

O–O 146

O=O 495

O–H 463

a. −583 kJ/mol d. −358 kJ/mol b. +2,450 kJ/mol e. −1,970 kJ/mol c. −1,078 kJ/mol
Chemistry
1 answer:
kykrilka [37]3 years ago
7 0

Answer:

a. −583 kJ/mol

Explanation:

First we start with the balanced chemical equation

N2H4 + O2 ------> N2 + 2 H2O

Breaking bonds is endothermic, it requires energy whereas bond forming is exothermic, it expels energy. So the net energy change during this reaction can be calculated this way

ΔH = bond breaking energy - bond forming energy

     = (4*388+163 + 495) - (941+4*463)

    = -583 kJ/mol

You might be interested in
How many electrons are in the highest occupied energy level of these atoms?
Romashka-Z-Leto [24]

Answer:

a.

Explanation:

because

beds Go to <URL> to see if the

4 0
3 years ago
What does air have to do with light refraction?
-BARSIC- [3]
When light travels from air into water,it slows down,causing it to change directions slightly
4 0
3 years ago
Read 2 more answers
What type of organic compound has the empirical formula CH2O and can serve as energy storage or the starting material for fats a
Luda [366]
Carbohydrates. CH2O is the most basic formula of simple sugars.Empirical formula is the lowest whole number ratio of atoms in a formula.For example glucose is C6H12O6 can be reduced by 6 to get CH2O. Simples sugars include glucose and fructose which can serve as sources of energy for fats and amino acids.
4 0
3 years ago
The acid dissociation constant ka for an unknown acid ha is 4.57 x 10^-3 what is the base dissociation constant kb for th econju
SashulF [63]

Answer:

2.19 x 10^-12.

Explanation:-

The relation between Ka and Kb for an acid and it's conjugate base is

Ka x Kb = Kw where Kw = ionic product of water.

So Kb = 10^-14 / (4.57 x 10 ^ -3)

= 2.19 x 10^-12

4 0
3 years ago
Which statement is correct about molarity and volume?
Oksana_A [137]

Answer:

Explanation:

If the choices are:

A. Molarity is defined as moles of solute per liter of solvent.

B. % by mass is defined as grams of solute per 100 g of solvent.

C. % by volume is defined as grams of solute per 100 L of solution.

D. Molarity is defined as moles of solute per liter of solution.

E. All of the above.

then the ans is E

7 0
3 years ago
Other questions:
  • How many Mg atoms are present in 170g of Mg
    15·1 answer
  • PLEASE ANSWER I WILL MAKE BRAINLIEST!!!
    15·2 answers
  • A particle of light has a wavelength of 7.0×10−7 m. What color of light is represented and what is the amount of energy released
    14·1 answer
  • If an aqueous solution of lead(II) nitrate (Pb(NO3)2) is mixed with an aqueous solution of potassium chloride (KCl) the precipit
    6·1 answer
  • For which of the following molecules or ions does the following description apply? "The bonding can be explained using a set of
    12·2 answers
  • Which phrases describe a model in science? Check all that apply.​
    12·1 answer
  • A class of substances known as __________ are used for their medicinal properties.
    9·2 answers
  • Helppp nowww plsss!!
    7·2 answers
  • Explain how a density current might form in the Arctic Ocean
    6·1 answer
  • Calculate the molar solubility of silver(i) bromate with ksp = 5. 5×10-5. also, convert the molar solubility to the solubility.
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!