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
VikaD [51]
3 years ago
11

In an experiment, a 0.5297 g sample of diphenylacetylene (C14H10) is burned completely in a bomb calorimeter. The calorimeter is

surrounded by 1.369 x 10^3 g of water. During the combustion the temperature increases from 22.95 to 26.05°C. The heat capacity of water is 4.184 J g-1°C-1. The heat capacity of the calorimeter was determined to be 916.9 J/°C.
1. Assuming that no energy is lost to the surroundings, calculate the molar heat of combustion of diphenylacetylene based on these data.
Chemistry
2 answers:
emmainna [20.7K]3 years ago
6 0

Answer:

Explanation:

To solve this type of problem, we have to keep in mind that the calorimeter will absorb some part of the heat released during combuston, and that the water in the bomb calorimeter will absorb the rest of the heat, assuming no heat is lost to the surroundings.

Thus to calculate the heat of combustion of diphenylacetylene in this question we will compute these 2 heats and add them together. Since we are asked to calculate the molar heat we will divide  this total heat by the mol of sample.

q water = m x c x ΔT

where m is the water mass, c the specific heat capacity of water and ΔT the change in temperature.

q water = 1.369 x 10³ g  x 4.184 J/gºC x ( 26.05- 22.95 ) ºC

             = 1.78 x 10⁴ J

q calorimeter = C x  ΔT

where C is the calorimeter specific heat, and ΔT is the change in temperature.

q calorimeter = 916.9 J/ºC x  ( 26.05- 22.95 )ºC = 2.84 x 10³ J

q total = 1.78 x 10⁴ J  +  2.84 x 10³ J = 2.06 x 10⁴ J

mol sample = mass / MW

molar mass C₁₄H₁₀ = 178.23 g/mol

mol C₁₄H₁₀  = 0.5297 g / 178.23 g /mol = 2.97 x 10⁻³ mol

molar heat of combustion C₁₄H₁₀ =   2.06 x 10⁴ J /  2.97 x 10⁻³ mol

                                                      =    6.93 x 10⁶ J / mol = 6.93 x 10³ kJ/mol

                                                           

V125BC [204]3 years ago
3 0

Answer:

the Molar heat of  Combustion  of  diphenylacetylene (C_{14}H_{10})  = -6.931 *10^3 \ kJ/mol

Explanation:

Given that:

mass of diphenylacetylene (C_{14}H_{10}) = 0.5297 g

Molar Mass of diphenylacetylene (C_{14}H_{10}) = 178.21 g/mol

Then number of moles of diphenylacetylene (C_{14}H_{10})  = \frac{mass}{molar \ mass}

= \frac{0.5297  \ g }{178.24 \  g/mol}

= 0.002972 mol

By applying the law of calorimeter;

Heat liberated by 0.002972 mole of diphenylacetylene (C_{14}H_{10})  = Heat absorbed by H_2O + Heat absorbed  by the calorimeter

Heat liberated  by 0.002972 mole of diphenylacetylene (C_{14}H_{10})  =  msΔT + cΔT

= 1369 g  × 4.184 J g⁻¹°C⁻¹ × (26.05 - 22.95)°C + 916.9 J/°C (26.05 - 22.95)°C

= 17756.48 J + 2842.39 J

= 20598.87 J

Heat liberated by 0.002972 mole of diphenylacetylene (C_{14}H_{10})  = 20598.87 J

Heat liberated by 1 mole of  diphenylacetylene (C_{14}H_{10}) will be = \frac{20598.87 \ J}{0.002972 \ mol}

= 6930979.139 J/mol

= 6930.98 kJ/mol

Since heat is liberated ; Then, the Molar heat of  Combustion  of  diphenylacetylene (C_{14}H_{10})  = -6.931 *10^3 \ kJ/mol

You might be interested in
Easy questions ha chemistry
joja [24]

Answer:

B

A

D

Explanation:

3 0
3 years ago
Read 2 more answers
What type of reaction is shown below? Check all that apply. 2Mg+O2—> 2MgO
SSSSS [86.1K]

Answer:

Reaction types are :

  • Combination(Mg and O combine)
  • Oxidation (O added to Mg)
  • Exothermic (light and heat released)
7 0
3 years ago
Read 2 more answers
Will give brainliest!!!!
Luda [366]
The answer is aldehyde
4 0
3 years ago
What evidence would support Maria's claim that the fossilized remains are that of a bird, class Aves, instead of a turtle, class
lora16 [44]

Your answer would be C.

6 0
3 years ago
Read 2 more answers
Does Monocercomonoides still meet the definition of a eukaryote? Why or why not?
KengaRu [80]

Answer:

Yes

Explanation:

They are a unique type of eukaryote because they lack an important organelle: mitochondria. Mitochondria are essential for producing cellular energy in most eukaryotic cells. However, due to its habitat, it is able to acquire energy from a process called  sulfur mobilization.

They are significant because they challenge the idea that eukaryotes need mitochondria to be classified as eukaryotic. However, they have other membrane-bound organelles such as a nucleus and Golgi apparatus, meaning they remain eukaryotic.

Research suggest they lost their mitochondria over time, rather than never having had them throughout their ancestry.

Because of all these reasons, they still meet the definition of a eukaryote.

6 0
3 years ago
Other questions:
  • Which career area in chemistry applies new discoveries to practical applications useful for consumers
    14·2 answers
  • Is lemon juice or orange juice more acidic? Please explain.
    13·1 answer
  • How many hours a day do famers leave the lights on for hens to lay eggs
    11·2 answers
  • Determine the number of electrons, neutrons and protons in an atom of arsenic -75.
    14·1 answer
  • Theoretically, how many moles of carbonic acid will be produced by 3.00 g sample of NaHCO3?
    13·1 answer
  • What are the criteria for the spontaneity of chemical reactions​
    13·1 answer
  • What is the area called in which the electrons are found ?
    7·1 answer
  • Given the following unbalanced equation:
    15·1 answer
  • Balance the following equation.<br> C3H8(g) + O2(g) → CO2(g) + H2O(l)
    12·1 answer
  • What is biochemistry​
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!