Answers
Answer 4.45 moles
Explanation:
Related Questions
HURRY!!!!!! HELP PLEASEEE
To begin the experiment, 1.65g of methane CH4 is burned in a bomb calorimeter containing 1000 grams of water. The initial temperature of water is 18.98oC. The specific heat of water is 4.184 J/g oC. The heat capacity of the calorimeter is 615 J/ oC . After the reaction the final temperature of the water is 36.38oC.
2. Calculate the change in temperature, ΔT. Show your work. (1pt)
3. Calculate the heat absorbed by water. Use the formula qwater = m • C • ΔT
Show your work (2pts)
4.Calculate the heat absorbed by the Calorimeter. Use the formula:
qcal = Ccal • ΔT Show your work. (2pts)
5. The total heat absorbed by the water and the calorimeter can be calculated by adding the heat calculated in steps 3 and 4. The amount of heat released by the reaction is equal to the amount of heat absorbed with the negative sign as this is an exothermic reaction. (2pts)
a.Using the formula ΔH = - (qcal + qwater ) , calculate the total heat of combustion. Show your work.
b. Convert heat of combustion (answer from part a) from joules to kilojoules. Show your work.
6. Evaluate the information contained in this calculation and complete the following sentence: (2pts)
This calculation shows that burning _______ grams of methane [TAKES IN] / [GIVES OFF] energy (Choose one).
7. The molar mass of methane is 16.04 g/mol. Calculate the number of moles of methane burned in the experiment. Show your work. (2pts)
8. What is the experimental molar heat of combustion in KJ/mol? Show your work. (2pts)
9. The accepted value for the heat of combustion of methane is -890 KJ/mol . Explain why the experimental data might differ from the theoretical value in 2-3 complete sentences. (2pts)
10. Given the formula:
% error= |(theoretical value - experimental value)/theoretical value)| x 100
Calculate the percent error. Show your work. (2pts)
Answers
The calorimter is equal to the heat released by the reaction. Calculate the heat released by the reaction.
What is the reaction?The reaction to the news can vary depending on who you are speaking to. For some, the news may be welcomed as a sign of progress and a move in the right direction. Others may be apprehensive, uncertain of the potential outcomes or changes that may come as a result. Some may be angry and frustrated, feeling as though the news has been a long time coming and they have not been given a say in the matter.
1. ΔT = 36.38oC - 18.98oC = 17.4oC
2. qwater = m • C • ΔT
qwater = (1000g)(4.184J/g oC)(17.4oC)
qwater = 71376.8 J
3. qcal = Ccal • ΔT
qcal = (615J/ oC)(17.4oC)
qcal = 10666.1 J
4. qreaction = qwater + qcal
qreaction = 71376.8 J + 10666.1 J
qreaction = 82042.9 J
To learn more about reaction
https://brainly.com/question/25769000
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Which of the following accurately describes the orbital path of most planets in our solar system?
The orbital path is in a perfect circle.
The orbital path looks circular.
The orbital path is in a large elliptical shape.
The orbital path varies greatly from planet to planet.
Answers
PLSSSS ANSWERRRRRR?????
Answers
The lines are closer together
Please give me Brainliest
The pH of tomato juice is 4, thus tomato is a (an) _______________ substance
Answers
Answer:
Acidic
Explanation:
pH from 0-6.9 are acidic substances
pH of 7 are neutral
pH above 7 to 14 are badic substances
Answer: Acidic
Explanation:
PH of 1-6 is considered acidic.
PH of 7 is neutral.
PH of 8-14 is considered basic (alkaline)
What is the value that is MEASURED in a lab?
Answers
Answer:
To use standard laboratory measurement devices to measure length, volume and mass amounts.
There
are
approximately
317,000,000
people
in
the
U.S.,
and
the
area
of
the
U.S.
is
about
4,000,000
square
miles.
If
the
people
were
spread
out
evenly,
about
how
many
people
are
there
per
square
Answers
Answer:
yesddgfhzxhcvnjxkcncjzdkccchjjbxbxbbk
which pollutants come from air? How and why do these form?
Answers
Answer:
Air pollution is caused by solid and liquid particles and certain gases that are suspended in the air. These particles and gases can come from car and truck exhaust, factories, dust, pollen, mold spores, volcanoes and wildfires.
Explanation:
moreee help science plsssssssssssssssss helpp
Answers
 why don't we ever see solid or liquid oxygen on earth?
Answers
The reason why you don’t see solid or liquid oxygen is because oxygen is a natural occurring gas. Gas can not be solid or liquid because there is too much energy to have volume/shape. That’s why you see oxygen tanks, as the tank keeps the gas contained and that is why you can’t see it in the air outside or in something like H20 (water).
Hope this helps :)
Just don’t open the link in the other answer. It’s a scam...
what is 606 as a 2 sig fig answer?
Answers
6, 0
thats the answer, i hope it helps
define a lone pair and give example
Answers
Explanation: ex: Water, Ammonia, hydrogen fluoride. come to mind as the simplest such molecules with lone pairs.
The N in ammonia has 1 lone pair and three bonds (to H).
The O in water has 2 lone pairs and two bonds (to H)
the F in Hydrogen fluoride has 3 lone pairs and one bond.
Answer:In chemistry, a lone pair refers to a pair of valence electrons that are not shared with another atom in a covalent bond and is sometimes called an unshared pair or non-bonding pair. Lone pairs are found in the outermost electron shell of atoms. They can be identified by using a Lewis structure.
please help me with this question
Answers
Answer: I believe it would be B. Genus
Explanation:
I looked up the definitions for you and genus is defined as the group above species. Picture of definition attached.
True or False: Only animals can move pollen from plant to plant.
A. True
B. False
Answers
i think false because of the wind or insects
PLEASEEEEE ANSWERRR??
Answers
Please give me Brainliest
Write a short paragraph about how gases are all around you. Provide at least 2 examples
Answers
Answer:fart and carbon are all around is
Explanation:
PLEASE Answer asap! Compare two periodic families below. You must include at least two facts about each family. You may use any description of properties or periodic trends to help you.
Answers
Answer:
The alkali metals/group 1 are recognized as a group and family of elements. These elements are metals. Sodium and potassium are examples of elements in this family. Hydrogen is not considered an alkali metal because the gas does not exhibit the typical properties of the group. The largest family of elements consists of transition metals/group 3-12/group 3a. The center of the periodic table contains the transition metals, plus the two rows below the body of the table (lanthanides and actinides) are special transition metals. Even though both are metals, transition metals have higher melting points; they have higher density; they are less reactive with water; they react and form ions with different charges, but Group 1 metals only form 1+ ions. (Hope the is helpful! You can reword it if you want...)
If you have 1.5 grams of silver nitrate, how many grams of silver could
you produce?
Answers
Answer:
0.95g of Ag we can produce
Explanation:
To solve this question we have to convert the mass of silver nitrate (AgNO₃) to moles. The moles of silver nitrate = Moles of Ag. Then, with molar mass of Ag we can know the mass of silver:
Moles AgNO₃ -Molar mass: 169.87g/mol-:
1.5g * (1mol / 169.87g) = 0.0088 moles Ag
Mass Ag -Molar mass: 107.87g/mol-:
0.0088 moles Ag * (107.87g / mol) =
0.95g of Ag we can produceWhich pieces of equipment are
needed to calculate the velocity of a
falling object?
A stopwatch and balance
B speedometer and magnet
C compass and tape measure
D tape measure and stopwatch
Answers
To calculate velocity you’ll need to know the height it is falling from and how long it takes to fall.
Hope this helps!
Please let me know if I was right.
Which of the following is an indication that a substance has undergone a chemical change?
A.
No new product has been formed.
B.
The color of the substance has not changed.
C.
The original constitute has not changed.
D.
The molecular structure has changed.
Answers
Answer:
D.
Hope it helps!!!!!!!!!
The attraction between water molecules and a Nation or a Clion occurs because water molecules are —
A.
nonpolar
B
symmetrical.
С
polar.
D
linear.
Answers
Answer:
answer is
c. Polar
hope this helps
what element has 5 protons, 7 electrons, and 6 neutrons
Answers
Answer: Boron
Explanation: lol
Answer:
Boron. (What kind of name is that?????????????)
Explanation:
Please help me on this
Answers
Answer:
the answer is 3(decay) and
the second isa 1(alfa particle) has a mass of equal to helium nucleus
A projectile is projected with an initial velocity of 40 m/s at a 45o angle to the horizontal. , calculate the total time travelled.
Answers
Answer:
5.77 s
Explanation:
From the question,
The total time travelled by the projectile = Time of flight (T)
T = 2usinθ/g............ Equation 1
Where T = Time of Flight of the projectile, u = Initial velocity, θ = Angle of projection to the horizontal, g = acceleration due to gravity
Given: u = 40 m/s, θ = 45°
Constant: g = 9.8 m/s²
Substitute these values into equation 1
T = 2(40)sin(45°)/9.8
T = 80sin(45°)/9.8
T = 80×0.7071/9.8
T = 5.77 s
What is the mass of 5.6 moles of Iron (III) Oxide?
Answers
Answer:
312.731
Explanation:
it had a long answer but im sure ur teacher wanted u to round it
hope this helps!
~goldfishareswag/brianna
:)
1) Find the gfm (gram formula mass, the gfm is the grams per mole. So, you’re pretty much finding one mole of Fe2O3) of Fe2O3
2 Fe: 2(55.845)
3 O: 3(15.9994)
=160 gfm
2) multiply gfm by mole number
160(1 mole of Fe2O3 is 160. What are 5.6 moles?)
160 x 5.6
= 896g
The gas phase decomposition of phosphine at 120 °C
PH3(g)1/4 P4(g) + 3/2 H2(g)
is first order in PH3 with a rate constant of 1.80×10-2 s-1.
If the initial concentration of PH3 is 8.48×10-2 M, the concentration of PH3 will be 2.45×10-2 M after
s have passed.
Answers
Answer:
The decreasing in concentration occurs after 69.0s
Explanation:
A first order reaction follows the equation:
Ln [A] = -kt + ln[A]₀
Where [A] is the concentration of the reactant after time t
k is rate constant of the reaction
And [A]₀ is the initial concentration of the reactant
Replacing:
Ln 2.45x10⁻²M = -1.80x10⁻²s⁻¹*t + ln8.48x10⁻²
-3.709 = -1.80x10⁻²s⁻¹*t -2.467
-1.2416 = -1.80x10⁻²s⁻¹*t
69.0s = t
The decreasing in concentration occurs after 69.0s
Calculate the value of Key in the following reaction if the equilibrium concentrations are
[H2S] -0.25 M, (H2) - 0.88 M, [S2] -0.44M.
2 H2Sig) = 2 H2(g) + S218)
Answers
Answer:
The value of the equilibrium constant Kc is 5.45
Explanation:
The "Law of Mass Action" states:
"For a reversible reaction in chemical equilibrium at a given temperature, it is true that the product of the concentrations of the products raised to the stoichiometric coefficients divided by the product of the concentrations of the reactants raised to their stoichiometric coefficients is a constant."
This constant was called the equilibrium constant. For a reaction:
aA + bB ⇄ cC + dD
the equilibrium constant Kc is:
[tex]Kc=\frac{[C]^{c} *[D]^{d} }{[A]^{a} *[B]^{b} }[/tex]
In this case, the balanced reaction is:
2 H₂S → 2 H₂ + S₂
So, the equilibrium constant Kc is:
[tex]Kc=\frac{[H_{2} ]^{2} *[S_{2} ] }{[H_{2} S]^{2} }[/tex]
The equilibrium concentrations are
[H₂S] =0.25 M[H₂]= 0.88 M[S₂]= 0.44MReplacing in the definition of equilibrium constant:
[tex]Kc=\frac{(0.88 M)^{2} *0.44 M }{(0.25 M)^{2} }[/tex]
Solving:
Kc= 5.45
The value of the equilibrium constant Kc is 5.45
what is rasching process only chemical reaction
Answers
Answer:
The Raschig process, the original commercial production process for hydrazine, involves oxidation of ammonia to chloramine with sodium hypochlorite, then further reaction of the chloramine with excess ammonia and sodium hydroxide to produce an aqueous solution of hydrazine with sodium chloride as a by-product.
Answer: The Rasching process is a chemical process for the producing phenol
Explanation:
Which of the following is a TRUE statement?
a.
A molecule always has three types of elements present
b.
Compounds always include the elements hydrogen and sodium
c.
Compounds include things we use in our everyday lives
d.
All elements prefer to hang out with other elements and form molecules
Answers
Answer:
b
Explanation:
H IT H-C --H + Ħ Н The model above shows the structural formula for ethane. What is the chemical formula for ethane? OA. C2H6 OB. 2CH3 Oc. 8CH OD. C6H2
Answers
Answer:
B
Explanation:
The shape of the directly sunlit portion of the Moon as viewed from
Earth
Answers
your answer:
lunar phases