![johnnydenali2820](/avatars/41084.jpg)
johnnydenali2820
27.03.2020 •
Chemistry
Mothballs are composed primarily of the hydrocarbon naphthalene (C10H8). When 1.025 gof naphthalene is burned in a bomb calorimeter, the temperature rises from 24.25 ∘C to 32.33 ∘C.Find ΔErxn for the combustion of naphthalene. The heat capacity of the calorimeter, determined in a separate experiment, is 5.11kJ/∘C.Express the change in energy in kilojoules per mole to three significant figures.ΔErxn = kJ/mol
Solved
Show answers
More tips
- H Health and Medicine How to Deal with Heat Stroke?...
- F Food and Cooking Discover the Health Benefits of Cedar Nuts...
- S Science and Technology Exploring Our Galaxy: How Many Planets are in the Milky Way?...
- S Science and Technology Colliders: How They Work and Why They Matter...
- A Animals and plants Unraveling the Mystery of Loch Ness: What Does the Loch Ness Monster Look Like?...
- L Leisure and Entertainment How Many Seasons are There in the TV Show Interns?...
- S Sport Playing Bowling: Rules and Advice for Novices...
- L Leisure and Entertainment The Best Film of 2010: A Look Back at the Academy Awards...
- S Sport How to Learn Swimming? Simple Tips for Beginners...
- C Computers and Internet What is Web 2.0 and How Does it Work?...
Answers on questions: Chemistry
- A Arts HEY EVERYONE FREE 10 PTS HERE I ll be up all night answering questions! I m just not tired lol so yeah I chose the subject to be arts b/c I am a piece of art!! Lol kidding...
- P Physics GOD IS coming faster then we know guys get right with God scripture says when it s the ending days we will all fall to ours knees and the ones who go to heaven will not suffer...
- H History When did Texas get Annex by the United States government?...
Ответ:
Explanation:
There are two energy flows in this reaction.
q₁ = heat from reaction
q₂ = heat to warm calorimeter .
Per the Law of Conservation of Energy,
q₁ + q₂ = 0
Data:
For the reaction
mass of naphthalene = 1.025 g
For the calorimeter
Ccal = 5.11 kJ·°C⁻¹; Ti = 24.25 °C; T_f = 32.33 °C
Calculations
(a) Moles of naphthalene
(b) ΔT
ΔT = T_f - Ti = 32.33 °C - 24.25 °C = 8.08 °C
(c) ΔE
Ответ:
ΔErxn = -5161 kJ/mol
Explanation:
Step 1: Data given
Mass of naphthalene = 1.025 grams
The temperature rises from 24.25 °C to 32.33 °C
Molar mass of napthalene = 128.17 g/mol
Step 2: Calculate moles
Moles = mass / molar mass
Moles naphthalene = 1.025 grams / 128.17 g/mol
Moles naphthalene = 0.0080 moles
Step 3: Calculate the amount of heat released
heat = (5.11 kJ/°C)(32.33 °C - 24.25 °C) = 41.3 kJ
Since there is heat released, this is negative = -41.3 kJ
Step 4: Calculate Δ(Hrxn) per mole of naphthalene is:
H = (-41.3 kJ)/(0.0080 moles) = -5161 kJ/mol
ΔErxn = -5161 kJ/mol
Ответ:
thanks that's cute loll
Explanation:
have a great day