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
sukhopar [10]
3 years ago
5

The combustion of magnesium creates so much energy so quickly that it is hard to measure its enthalpy directly using a simple ca

lorimeter. However, you will break this reaction down into other intermediate reactions whose enthalpies you can – and will – measure. What broad question are you answering by doing this experiment?
Chemistry
2 answers:
riadik2000 [5.3K]3 years ago
6 0
I believe your answer is: What is the enthalpy of formation of magnesium oxide?
Hope this helps! :)
QveST [7]3 years ago
5 0

Answer:  Enthalpy of the reaction of combustion of magnesium

Explanation: The enthalpy of reaction of combustion of methane is usually determined by the usage of the Hess law .

Hess Law states that regardless of the multiple steps of the reaction, the total enthalpy change is equal to the sum of the enthalpies of all the steps involved.

Thus in order to find out the total change in enthalpy of magnesium oxide , we can break the reaction into several intermediate reactions whose entalpies can be easily determined.

You might be interested in
Read the passage. Look at the underlined section marked number 9. There may be a mistake in the way the sentence is written. If
Alexus [3.1K]

The answer is D just did it

5 0
3 years ago
Read 2 more answers
A chemistry graduate student is given 125.mL of a 1.00M benzoic acid HC6H5CO2 solution. Benzoic acid is a weak acid with =Ka×6.3
lubasha [3.4K]

Answer:

53.9 g

Explanation:

When talking about buffers is very common the problem involves the use of the Henderson Hasselbach formula:

pH = pKa + log [A⁻]/[HA]

where  [A⁻] is the concentration of the conjugate base of the weak acid HA, and [HA] is the concentration of the weak acid.

We can calculate pKₐ from the given kₐ ( pKₐ = - log Kₐ ), and from there obtain the ratio  [A⁻]/HA].

Since we know the concentration of HC6H5CO2 and the volume of solution, the moles and mass of KC6H5CO2  can be determined.

So,

4.63 = - log ( 6.3 x 10⁻⁵ ) + log [A⁻]/[HA] = - (-4.20 ) + log [A⁻]/[HA]

⇒ log [A⁻]/[HA]  = 4.63 - 4.20 =  log [A⁻]/[HA]

0.43 = log [A⁻]/[HA]

taking antilogs to both sides of this equation:

10^0.43 =  [A⁻]/[HA] = 2.69

 [A⁻]/ 1.00 M = 2.69 ⇒ [A⁻] = 2.69 M

Molarity is moles per liter of solution, so we can calculate how many moles of  C6H5CO2⁻ the student needs to dissolve  in 125. mL ( 0.125 L ) of a 2.69 M solution:

( 2.69 mol C6H5CO2⁻ / 1L ) x 0.125 L  = 0.34 mol C6H5CO2⁻

The mass will be obtained by multiplying 0.34 mol times molecular weight for KC6H5CO2 ( 160.21 g/mol ):

0.34 mol x 160.21 g/mol = 53.9 g

3 0
3 years ago
I need help with this question 20 points and brainiest if ur right
Nutka1998 [239]

Answer:

The volume is 8 cm³

3 0
2 years ago
Read 2 more answers
A sample of gas at 47C and 1.5 pressure occupies a volume of 2.20L. What volume would this gas occupy at 107C and 2.5 pressure?
Brums [2.3K]

Answer:

Explanation:

21

8 0
3 years ago
Silver and gold are both considered coinage metals. How does a mile of silver compare with a mole of iron ?
fomenos

Answer:

both have the same number of atoms

Explanation:

saw it on a quizlet

7 0
3 years ago
Other questions:
  • Exposure to what type of radiant energy is sensed by human skin as warmth?
    7·2 answers
  • What nevres carrys information from the hairs inside the cochlea?
    6·1 answer
  • What is in a list of weak acids?
    11·1 answer
  • Write the number in scientific nation form
    7·1 answer
  • How many Milligrams of potassium chloride KCl are required to make a 15 mL of a 1.20 M solution?​
    6·1 answer
  • In an endothermic reaction would energy be considered a reactant or a product?
    10·1 answer
  • Why Ammonia is nut dried by passing through concentrated H2SO4.​
    11·1 answer
  • A solution of hcl in water conducts electricity, but a solution of hcl in chloroform, chcl3, does not. what does this observatio
    15·2 answers
  • A Brønsted-Lowry acid Question 9 options: A) has a lower pH than vinegar. B) is any species that donates a proton. C) is any spe
    8·1 answer
  • Which of the following can serve as evidence to support the claim that human consumption of water impacts earths system
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!