Answer:
[tex]\Delta H_{rxn}=-0.111 \frac{kJ}{mol}[/tex]
Explanation:
Hello!
In this case, since the total heat flow due to the reaction equals the negative of the calorimeter's heat, we can first compute the former as shown below:
[tex]Q_{rxn}=-C\Delta T\\\\Q_{rxn}=6.38\frac{J}{\°C}*3.2\°C=-20.416J[/tex]
Now, since this total heat flow due to the reaction is defined in terms of the heat of reaction and the total reacted moles:
[tex]Q_{rxn}=n*\Delta H_{rxn}[/tex]
Thus, we compute the moles in 8.5 g of ethanol:
[tex]n=8.5g*\frac{1mol}{46.08g}=0.185mol[/tex]
Therefore, the heat of reaction results:
[tex]\Delta H_{rxn}=\frac{Q_{rxn}}{n} =\frac{-20.416J}{0.185mol} =-110.7J/mol\\\\\Delta H_{rxn}=-0.111 \frac{kJ}{mol}[/tex]
Best regards!
can someone answer the 4 questions? (4 is optional) it would really help me out thanks
Answer:
1)Energy converter is the transformation of one form of energy into another form .It is more specifically that the term energy conversions refers to the process through which energy is changed into forms that are useful to humans .For 100 of years humans have used an array of devices and systems for this purpose.
2) The three energy converters that you or your family use regularly are
Electric Iron Electric BulbElectric generator3)The three kinds of power plants that produce electricity in Ontario are
Nuclear Power PlantsHydroelectric Power PlantsGeothermal Power Plants4)A power plant is an industrial facility that generates electricity from primary energy most of the power plants use one more generators that convert mechanical energy into electrical energy in order to supply power to the electrical grid for society's electrical needs.
may be this was ur answer for ur question u wanted
Which is NOT an assumption of matter made by the kinetic molecular theory of gases?
a. The kinetic energy of particles is determined by their mass and their velocity.
b. Gas particles are widely dispersed and therefore are not affected significantly by attractive or repulsive forces.
c. Gas particles are small and take up little volume relative to the volume of the space around them.
d. When particles collide, their total energy is decreased.
Answer:
There is strong attraction or repulsion between the gas particles.In other words,they strongly interact with each other" is NOT an assumption made by kinetic molecular theory.
The theory that attempts to elucidate the behaviour of gases is known as kinetic molecular theory.
The postulates of kinetic molecular theory of gases are given below,
\bigstarGases consist of large number of identical particles(atoms or moleculesthat are so small and so far apart
\bigstar There is no force of attraction between the particles of a gas at ordinary temperature and pressure
\bigstarParticles of a gas are always in constant and random motion
\bigstarParticles of a gas move in all possible directions in straight lines. During their random motion, they collide with each other and with the walls of the container
\bigstarCollisions of gas molecules are perfectly elastic. This means that total energy of molecules before and after the collision remains same
\bigstarThe average kinetic energy (energy due to motion) of the gas particles is proportional to the temperature measured in kelvin. As temperature increases, the particles move faster and have more energy
\bigstarAt any particular time, different particles in the gas have different speeds and hence different kinetic energies.
\therefore From the above data it is clear that "There is strong attraction or repulsion between the gas particles.In other words,they strongly interact with each other" is NOT an assumption made by kinetic molecular theory.
Explanation:
According to Kinetic theory of gases, the kinetic energy of particles are derived from the temperature and not by their mass and velocity. Hence, option a is not an assumption of kinetic theory of gases.
What is kinetic theory gases ?According to kinetic theory of gases, gases substances are made of tiny particles. These particles when taken in a container have negligible volume compared to the volume of the container.
The collision between the gaseous particles and and between the particles and the wall make the pressure within the container. The kinetic energy of the particles is directly proportional to the temperature of the gas.
According to the theory, the kinetic energy is not determined from the mass and velocity of the particles, but by the temperature of the system. Hence, option a is not an assumption of kinetic molecular theory of gases.
Find more on kinetic theory:
https://brainly.com/question/14349214
#SPJ3
Is Iridium transparent, translucent, or opaque?
Answer:
It's Opaque because it's a Hard Mattel
Explanation:
(⌐■-■)/━☆ﾟ.*･｡ﾟHave A Good Day
What is the maximum number of moles of PH 3 that can be formed when 0.2 formed moles of phosphorus reacts with 4 moles of hydrogen to form PH 3? P 4(g) + 6H 2 (g) 4PH 3 (g)
Answer:
The maximum number of moles of PH₃ that can be formed is 0.8 moles.
Explanation:
The balanced reaction is:
P₄ + 6 H₂ → 4 PH₃
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of each compound participate in the reaction:
P₄: 1 moleH₂: 6 molesPH₃: 4 molesThe limiting reagent is one that is consumed first in its entirety, determining the amount of product in the reaction. When the limiting reagent is finished, the chemical reaction will stop.
To determine the limiting reagent, you can use a simple rule of three as follows: If by stoichiometry of the reaction 6 moles of hydrogen react with 1 mole of phosphorus, 4 moles of hydrogen will react with how many moles of phosphorus?
[tex]moles of phosphorus=\frac{4 moles of hydrogen*1 mole og phosphorus}{6moles of hydrogen}[/tex]
moles of phosphorus= 0.667
But 0.667 moles of phosphorus are not available, 0.2 moles are available. Since you have less moles than you need to react with 4 moles of hydrogen, phosphorus will be the limiting reagent.
Then you can apply the following rule of three: if by stoichiometry 1 mole of P₄ forms 4 moles of PH₃, 0.2 moles of P₄ will form how many moles of PH₃?
[tex]moles of PH_{3} =\frac{0.2 moles of P_{4} *4 moles of PH_{3} }{1 mole of P_{4} }[/tex]
moles of PH₃= 0.8
The maximum number of moles of PH₃ that can be formed is 0.8 moles.
Transferring charge by touching or rubbing is called-
A) charging by contact
B) convection
C) insulation
D) none of these
Answer:
A) Charging by contact
Explanation:
Transfer of heat by direct contact, Heat energy is conducted from the hotter medium to the cooler medium
i just need an explanation :) so the problem was " what is the mass of 5 molecules of water(H2O) , in grams?" my teacher said the answer is 1.50 x 10^-22 but i dont understand why. why is it not 1.50 x 10^24, why is the exponent negative?
Answer:
Explanation:
The exponent is negative because water molecules are absolutely tiny. You can't see a molecule of water on the palm of your hand with your naked eyes, right? If a the mass of a molecule was 1.50 x 10^24, it'd be HUGE... like absolutely massive (possible the size of your city). Molecules are just tiny, tiny particles
how many moles of ammonia (NH3) are in 224L at standard pressure?
Answer:
10 moles
Explanation:
(224 L)*(1 mol/22.4 L) = 10 mol
1 mol/22.4 L is the conversion factor under standard temperature and pressure
which horizon has the least weathered rocks? How do you know?
Answer:
C: The C horizon is a subsurface horizon. It is the least weathered horizon. Also known as the saprolite, it is unconsolidated, loose parent material. The master horizons may be followed by a subscript to make further distinctions between differences within one master horizon.
Explanation:
How many oxygen molecules are in this compound: H2O
Answer:
1 oxygen molecule is present in H₂O
Explanation:
How to find out?
There's a 2 beside H in H₂O showing that there are '2 atoms of hydrogen'
However there's no number to the right of Oxygen, so it is just 1.
Describe 2 theories on the origin of the moon
Answer:
According to the text "After the sun spun to light, the planets of the solar system began to form. But it took another hundred million years for Earth's moon to spring into existence. There are three theories as to how our planet's satellite could have been created: the giant impact hypothesis, the co-formation theory and the capture theory."
~Deku
Explanation:
2A → B + C The above reaction is run and it is found that a plot of the natural log of the concentration versus time is linear. This indicates that the reaction is ...
Answer:
zero order reaction
Explanation:
The seem to be a reaction is zero order as the data only fits to zero order integrated rate law.
Integrated rate law:
[A] = [A]_0 – kt
Here y = [ A] and slope is -k , so when we plot concentration of A with respect to t then we get the equation in the form of line
y = mx + c
So the answer Zero order in [A]
An ionic compound that conducts electricity is called an ______
Answer:
Electrolyte
hope it helps and your day will be full of happiness
A mixture of PCl5(g), PCl3(g), and Cl2(g) is in a 1.00 L reaction vessel. The total pressure of the reaction system is 1.40 atm at equilibrium. Then the volume of the reaction vessel is reduced from 1.00 L to 0.50 L and equilibrium is re-established at constant temperature. What is the total pressure of the system at this point?
Answer:
The total pressure immediately after the volume reduction is 2.8 atmospheres
Explanation:
The question parameters are as follows;
The initial volume of the reaction vessel, V₁ = 1.00 L
The initial pressure of the reaction system, P₁ = 1.40 atm
The final volume of the reaction system, V₂ = 0.50 L
With the assumption that the gas mixture behaves as an ideal gas, and the temperature is constant, by Boyle's law we have;
P₁·V₁ = P₂·V₂
Where;
P₁ = The initial pressure in the reaction vessel
V₁ = The initial volume in the reaction vessel
P₂ = The total final pressure in the reaction vessel after the reduction in the vessel volume
V₂ = The final volume in the reaction vessel
∴ P₂ = P₁·V₁/V₂
From which we have;
P₂ = 1.40 atm × 1.00 L/(0.50 L) = 2.8 atm
The total final pressure in the reaction vessel, P₂ = 2.8 atm.
A STACK OF BOOKS WEIGHED 5 KILOGRAMS. ONE BOOK, WHICH WEIGHED 1,000 GRAMS, WAS
REMOVED FROM THE STACK HOW MUCH DID THE REMAINING BOOKS WEIGH?
Answer:
the remaining books weigh 4 kilograms or 4000 grams
Look at the dots around each symbol and the energy levels from the resources above;
Answer the questions in the text entry option for this assignment.
Copy and paste questions and respond in complete sentences.
Include a space between each question.
Be specific with your responses for each question. Assume your reader has no knowledge of the subject and you are teaching them via your answers.
Please answer the following questions:
Why does Na have only one dot?
Why do none of these diagrams show more than 8 dots?
What relationship do you notice between the dots in these two charts?
The number of dots that hydrogen and helium have in their dot diagram is the same as the number of electrons shown for them on the Periodic Table. Why? (Hint: Octet Rule (Links to an external site.))
Hello! Here's the answer I was able to come up with:
Why does Na have only one dot?
Sodium, or Na, has only one valence electron. (This makes the atom tend to participate in ionic bonding and "give" its single valence electron to an atom like chlorine.)
Why do none of these diagrams show more than 8 dots?
It is physically impossible for an atom to have more than 8 electrons in its valence layer, according to the Octet Rule.
What relationship do you notice between the dots in these two charts?
The dot diagram for each element represents the number of electrons each element will have in its outermost, or valence, shell. (2-8-8)
The number of dots that hydrogen and helium have in their dot diagram is the same as the number of electrons shown for them on the Periodic Table. Why?
An atom can have a maximum of two electrons in its innermost layer. Hydrogen and helium have only one and two electrons, respectively, so they don't have enough electrons to actually have more than one layer. Therefore, their outermost layer is, in fact, their only layer. This is why the number of dots that hydrogen and helium have in their dot diagram is the same as the number of electrons shown for them on the Periodic Table.
Don't copy this word for word! You will most likely be in trouble for plagiarism. Instead, rewrite these ideas in your own words, or paraphrase. Good luck, and I know you can do it! ♥
8. Write the notation of an atom 'X', if the mass number is A and the atomic number is Z.
Answer:
[tex]^A_ZX[/tex] is the notion of an atom 'X', if the mass number is A and the atomic number is Z
Explanation:
The symbol of the element is "X"
The notion comprises of symbol of element "X" in the center.
On the upper left side of the symbol mass number "A" is kept and on the lower left side of the symbol, atomic number "Z" is kept.
Thus, notion will be
[tex]^A_ZX[/tex]
Is this answer right ?
Answer:
YESExplanation:
Explanation
#KEEPSTUDYINGYes because it released the most amount of heat overall!!! well done xx
QUESTION 8
DOK 4
Watch later Share
Imagine that an atom of Fluorine (F) can bond with one
of the following atoms. Which one do you think it is
most likely to bond with? Why?
Lithium (Li)
Beryllium (Be)
Boron (B)
Carbon (C)
For more videos,
check out:
Click to answer
ne
T
www.video
chemistry
textbook.com
Youlube
SAVE DRAFT
SUBMIT
13:22 / 16:52
СС
Answer:
Li
Explanation:
F is a strongest electronegative element and it will combine with an element with low electronegativity. From the list provided, the element is Li.
Create a timeline to show how atomic structure was developed over the centuries?
Answer A`bousi
Explanation:
How are igneous and sedimentary rocks similar? A.They are both formed by erosion. B.They are both formed from cooled lava. C.Heat and pressure can turn them into lava. D.Heat and pressure can turn them into metamorphic rock.
Answer:
D
Explanation:
I learned this last year.
HELP PLEASEEEE!!!!!!!!
Nitrogen (N)) reacts with hydrogen (H) to produce ammonia (NH3). Represent this reaction in terms of:
Particles
b. Moles
C. Mass
Answer:
C the answer is c
Explanation:
ITS C
True or False: Tsunamis always look like a towering wall of water approaching the beach.
Answer:
false
Explanation:
Answer:
True
Explanation:
they can get up to several hundreds of feet.
Boiling point of the substance is directly proportional to
Answer:
The boiling point is directly proportional to the surface area which is proportional to the molecular weight.
Explanation:
why do scientist think the earths core have iron in it .
How many joules of heat are absorbed to raise the temperature of 125 grams of water at 1 atm from 35°C to its boiling point, 100.°C.
Answer:
33962.5 J
Explanation:
From the question given above, the following data were obtained:
Mass (M) = 125 g
Initial temperature (T₁) = 35 °C
Initial temperature (T₂) = 100 °C
Specific heat capacity (C) = 4.18 J/gºC
Heat (Q) absorbed =?
Next, we shall determine the change in temperature. This can be obtained as follow:
Initial temperature (T₁) = 35 °C
Initial temperature (T₂) = 100 °C
Change in temperature (ΔT) =?
ΔT = T₂ – T₁
ΔT = 100 – 35
ΔT = 65 °C
Finally, we shall determine the heat absorbed. This can be obtained as follow:
Mass (M) = 125 g
Change in temperature (ΔT) = 65 °C
Specific heat capacity (C) = 4.18 J/gºC
Heat (Q) absorbed =?
Q = MCΔT
Q = 125 × 4.18 × 65
Q = 33962.5 J
Therefore, the heat absorbed is 33962.5 J
stoichiometrically when 0.01 kg of CaCO3 is heated to produce CO2, occupied a volume at STP is
a. 2.2414 dm^3
b. 22.414 dm^3
c. 22414 dm^3
d. 224014 dm^3
Answer:
anjsbzhahxbVAbzbsbsbsbsjsjsdp
The picture below shows xylem and phloem vessels, which are tube-
like structures in a plant's roots and stems. Phloem is adapted for
transporting the glucose made during photosynthesis to the roots and
stems.
Phloem
Xylem } Vascular
stem
τρος
Xylem
Phloem
Which function is xylem specifically adapted to perform in plants?
(7.12A)
A
It helps prevent wer loss
B
It transports water from the roots to the leaves
с
It exchanges gases with the atmosphere
D
It captures sunlight for photosynthesis
Answer:
B
Explanation:
it transports water from roots to the leafs
Which molecule has the most atoms?
A. CO2
B. N202
C. CO
D. H₂O S
15. What is the molar mass of H2CO3?
(atomic mass: C = 12.01, H = 1.01, 0 = 15.99)
Answer:
62.00
Explanation:
H2 means that there are two moles of hydrogen so multiply the atomic mass by two (1.01 × 2 = 2.02)
C only has one mole sp leave 12.01 alone
And multiply oxygen by 3 because there are three moles of oxygen (15.99 × 3 = 47.97)
Add them all together!
2.02 + 12.01 + 47.97 = 62.00 for molar mass
Which of the following are decomposition reactions? ch4 (g) + o2 (g) → co2 (g) + h2o (l) cao (s) + co2 (g) → caco3 (s) mg (s) + o2 (g) → mgo (s) pbco3 (s) → pbo (s) + co2 (g)
Answer:
I cant really see the individual problems very well but i hope this helps
Explanation:
Decomposition = one thing -> 2 or more things
Synthesis= 2 or more things -> 1 thing