The amount of gas present in the sample which occupied the given volume at the given pressure and temperature is 0.3mol.
Ideal Gas LawThe Ideal gas law states "that pressure multiplied by volume is equal to moles multiply by the universal gas constant multiply by temperature of gas. It is expressed;
[tex]PV = nRT[/tex]
Where P is pressure, V is volume, n is the amount of substance, T is temperature and R is the ideal gas constant( [tex]R = 0.08206 Latm/molK[/tex]
Given the data in the question;
Volume; [tex]V = 4.32L[/tex]
Pressure; [tex]P = 1.45atm[/tex]
Temperature; [tex]T = -18^oC = 255.15K[/tex]
Amount of gas; [tex]n =\ ?[/tex]
To determine the moles of gas, we substitute our given values into the expression above.
[tex]PV = nRT\\\\1.45atm * 4.32L = n * 0.08206Latm/molK * 255.15K\\\\6.264Latm = n * 20.937609Latm/mol\\\\n = \frac{6.264Latm}{20.937609Latm/mol} \\\\n = 0.3mol[/tex]
Therefore, the amount of gas present in the sample which occupied the given volume at the given pressure and temperature is 0.3mol.
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Convert the answer from #7 to kg. Use the correct significant figures.
Answer:
Socratic app
Explanation:
it will help you
2. A 0.2719 g sample containing CaCO3 reacted with 20.00 mL of 0.2254 M HCl. Given that HCI was excess. The excess HCl required exactly 20.00 mL of 0.1041 M NaOH to reach the end-point using phenolphthalein indicator. Determine percentage purity of CaCO3 in the sample. The reraction involved is CaCO3(s) + 2HCl(aq) → CaCl₂(aq) + 2H₂O(l) The titration reaction is HC(aq) + NaOH(aq) NaCl(aq) + H₂O(1)
The calculated percentage purity of the original sample of calcium carbonate is 44%.
What is excess titration?In the back titration of the excess acid, we neutralize the excess titrand left in a system.
We have the reaction equation;
CaCO3 + 2HCl ----> CaCl2 + H2O + CO2
To get the moles of HCl = 0.2254 M * 20/1000 L = 0.0045 moles
The reaction involving the excess acid occurs thus;
HCl + NaOH ----> NaCl + H2O
Number of moles of NaOH = 0.1041 M * 20/1000 = 0.0021 moles
We have a 1:1 hence 0.0021 moles of HCl reacted also
Number of moles of HCl that reacted with CaCO3 initially = 0.0045 moles - 0.0021 moles = 0.0024 moles
Given the stoichiometry of the reaction, 0.0012 moles of CaCO3 reacted.
Hence;
Mass of pure CaCO3 in the sample= 0.0012 moles * 100 g/mol = 0.12g
Percent purity of the sample = 0.12g/0.2719 g * 100/1
= 44%
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9. Compound A, with molecular formula C5H₁2 has only 1° and 4° carbons. What is its structure? Its other isomer has only 1°, 2° and 3° carbons. What is its structure also?
draw the structure
Answer:
Ok giv me a min
Explanation:
Laura sees a horse pulling a buggy.
Which statement best describes the forces acting on the horse and buggy?
The net forces exerted on the horse and cart are the same, but the action force is larger.
The net forces exerted on the horse and cart are the same, but they are in the same direction.
The net forces exerted on the horse and cart are not the same, so the two forces cancel out.
The net forces exerted on the horse and cart are not the same, so they are not balanced forces.
Answer:
B
Explanation:
I think that the anserw is B.
One-fourth of a gaseous mixture is Argon and 3/4 of the gas is Oxygen. The total pressure in the container
is 8 atmospheres. What is the partial pressure of the Argon?
Answer:
nose
Explanation:
xde
Which boilers recovers waste heat from a process?
[tex]\large\red{\underline{\textbf{Given:-}}}[/tex]
Answer:
WHR Boilers
Explanation:
I hope this helps.
Which type of stars have the highest luminosity?
A. main sequence
B. blue giants
C. red super giants
D. BOTH blue giants and red super giants
Answer: Red supergiant.
Explanation:
The stars in group C are even more luminous than the giants. These are super giants, the largest of stars with extremely high luminosisties. A red supergiant such as Betelguese would extend beyond the orbit.
What do the dots within a lewis of a bonded molecule represent?
Take a example of water
A lone pair is present over 0Attached structure
The blood carries nutrients to where they are needed. True False
Answer:
True
Explanation:
Answer:
true
Explanation:
A process that leads to the transformation of one set of chemical substances to another
A. Reactants
B. Chemical reaction
C. Law of conservation of mass
D. Products
Answer:
B . chemical. reaction
Explanation:
B chemical reaction
Select the correct answer.
Why are metals good conductors of heat and electricity?
A.
anions rotate around the stationary electrons
B.
cations rotate around the stationary electrons
C.
free moving atoms in metals carry both heat and electric current
D.
free moving electrons in metals carry both heat and electric current
E.
free moving protons in metals carry both heat and electric current
Answer:
D
Explanation:
the correct answer is D
Noah is conducting a science experiment and needs to analyze iron and sulfur. Which of the following will he compare to determine the amounts of each substance?
movement of the atoms in each substance
movement of the atoms in each substance
molecular mass of each substance
molecular mass of each substance
mass of each substance
mass of each substance
vibration of the atoms in each substance
vibration of the atoms in each substance
Answer:
molecular mass of each substance
molecular mass of each substance
Explanation:
When 96 grams of oxygen are produced, how many grams of hydrogen must react
according to the equation 2H2+O2--> 2H20?
A. 12
B. 6
C. 48
D. 24
How are potential and kinetic energy different?
Potential energy is stored in a battery, and kinetic energy is released thermal energy that causes electricity.
Potential energy is stored in an object, and kinetic energy is released mechanical energy that causes motion.
Kinetic energy is the movement of an object, and potential energy is released electrical energy when an object moves.
Kinetic energy is stored in an object, and potential energy is released mechanical energy that causes motion.
Answer:
b) potential energy is stored in an object, and kinetic energy is released mechanical energy that causes motion.
Explanation:
potential energy is stored because it is the possible energy of an object if a force is acted upon it. on the other hand, kinetic energy is essentially when potential energy is being acted upon or changed.
Answer: The second option
Explanation: For example, if a ball is sitting at the top of a hill, it has a lot of potential energy. If it then falls off, potential energy will turn into kinetic energy and the ball will roll down the hill.
an organisms particular role in its habitat,or when and how it survives, is called its
Answer:
Niche.
A niche is a place where an organism lives at a given time or how the organism lives there.
Hi
Can someone explain the second marking point?
Why is it bubbles of air and not C02?
2AI(NO3)3 + 3Na2CO3 → Al2(CO3)3(s) + 6NaNO3
What is the ratio of moles of AI(NO3)3 to moles Na2CO3?
The ratio of moles of AI(NO3)3 to moles Na2CO3 in the reaction is 2:3
In the reaction 2 moles of AI(NO3)3 reacted with 3 moles Na2CO3 so the ratio of the moles is 2 is to 3 represented as 2:3
hope it helps
Calculate the freezing point and boiling point of each aqueous solution, assuming complete dissociation of the solute.
a. 0.100 m K2S
b. 21.5 g of CuCl2 in 4.50 * 102 g water
c. 5.5% NaNO3 by mass (in water)
The freezing points of each of the solutions are as follows;
0.100 m K2S - - 0.558oC
21.5 g of CuCl2 in 4.50 * 102 g water - -2oC
5.5% NaNO3 by mass (in water) - - 2.6oC
What is freezing point?The freezing point is the point at which liquid changes to solid. Let us now look at the freezing point of each solution.
a)
Since;
ΔT = K m i
K = 1.86 oC m-1
m = 0.100 m
i = 3
ΔT = 1.86 oC m-1 * 0.100 m * 3 = 0.558oC
Freezing point = 0oC - 0.558oC = - 0.558oC
b) Number of moles of CuCl2 = 21.5 g/134.45 g/mol = 0.16 moles
molality = 0.16 moles/0.45 Kg = 0.36 m
ΔT = K m i
ΔT = 1.86 oC m-1 * 0.36 m * 3 = 2oC
Freezing point = 0oC - 2 = -2oC
c) Number of moles of NaNO3 = 5.5g/85 g/mol = 0.065 moles
molality of the solution = 0.065 moles/0.0945 Kg = 0.69 m
ΔT = 1.86 oC m-1 * 0.69 m * 2 = 2.6oC
Freezing point = 0oC - 2.6oC = - 2.6oC
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The change in enthalpy that occurs in the process of converting reactants to products in a chemical reaction is called the _____ of reaction.
Answer:
∆H or Enthalpy of the reaction
Explanation:
If ∆H is +ve
Reaction is exothermicExample:-Combustion, mixing sodium/potassium in waterIf ∆H is -ve
Reaction is endothermicEx:-Melting of iceWhich of the following is most likely to lose electrons in an ionic compound?
a. lead (Pb)
b. carbon (C)
C. oxygen (O)
d. hydrogen (H)
Answer:
a. Lead (Pb)
Am 100% sure
Hope it helps
please mark me as brainliest
A soil sample of 2.65g was analyzed and found to contain 0.0625mg of Ca2+ and 2.45*10^-3g of Mg2+.Classify each analyte based on its level in the soil sample
Based on the milligram per Kg of soil sample of each analyte, calcium ion, Ca2+ and magnesium ion, Mg2+ are both classified as macronutrients.
What are soil nutrients?Soil nutrients are minerals which are found present in the soil and which are required by plants for their growth and development.
Soil nutrients can be classified based on amount needed by plants as well as the amount present in the soil into:
micronutrients- present in small amounts (<100 mg/kgmacronutrients- present in relatively larger amounts (>100 mg/kg)The mg/Kg of each analyte in the soil sample is as follows:
mass of soil sample = 2.65 g = 0.00265 kg
Calcium ion:
amount per mg/Kg of soil sample = 0.625mg/0.00265 kg
amount per mg/Kg of soil sample = 236 mg/kg
Magnesium ion:
0.00245 g = 2.45 g
amount per mg/Kg of soil sample = 2.45 mg/0.00265
amount per mg/Kg of soil sample = 924 mg/Kg
Therefore, calcium ion, Ca2+ and magnesium ion, Mg2+ are both classified as macronutrients.
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Which of the following UV rays has the highest energy that damages your skin the most?
A. UVA
B. UVB
C. X-ray
D. Infrared (IR)
Which is the correct step(s) for this reaction mechanism?
O NO2 + CO2 + CO NO + CO2
O step 1: NO2 + NO2 → NO + NO3 (slow)
step 2: NO3 + CO → NO2 + CO2 (fast)
O step 1: NO + NO3-NO + NO3 (slow)
step 2: NO3 + CO → NO + CO2 (fast)
O step 1: 2N02 + NO 2NO + NO3 (slow)
step 2: NO3 + CO → 2NO2 + CO2 (fast)
The reaction mechanims shows the sequence of steps through which a reaction occurs. The reaction mechanism for this reaction is;
step 1: NO2 + NO2 → NO + NO3 (slow)
step 2: NO3 + CO → NO2 + CO2 (fast)
What is reaction mechanism?We have to note that not all reactions occur in a single reactive encounter. If a reaction occurs in a single reactive encounter then it is called an elementary reaction.
The reaction mechanim shows the reaction sequence of a non elementary reaction. The correct mechanims of this reaction is shown as;
step 1: NO2 + NO2 → NO + NO3 (slow)
step 2: NO3 + CO → NO2 + CO2 (fast)
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Nitric acid (NO) reacts with oxygen gas to form nitrogen dioxide (NO2), a dark brown gas:
2NO(g) + O2(g) → 2NO2(g)
In one experiment, 0.886 mole of NO is mixed with 0.503 mol of O2.
Calculate which of the two reactants is the limiting reagent. (5 points)
Calculate also the number of moles of NO2 produced. (5 points)
What reactant is left over and how much of it is left over? (5 points)
Answer:
Lim reag = NO .07 mole of O2 left over
Explanation:
From the equation, you need twice as many moles of NO as O2
2 x moles O2 = 2 * .503 moles = 1.06 moles of NO needed....you do not have enough so this is the limiting reagent O2 will be left over
1/2 * .866 = .433 moles of O2 used .503 - .433 = .07 mole O2 leftover
An atom that gains electrons is called a(n) _________.
A. isotope
B. magnet
C. None of these
D. negative ion
negative ion or anion
hope it helps...!!!
Answer:
C. None of these
Explanation:
The first excited state of Ca is reached by absorption of 422.7 nm light. Find the energy difference (kJ/mole) between the ground and first excited state. Watch your units. A. 2.83 x 10-7 B. 4.70 x 10-22 C. 283 D. 4.70 x 10-19 E. 457
For the excited state of Ca at the absorption of 422.7 nm light,the energy difference is mathematically given as
E= 4.70x10-22 kJ/mol
What is the energy difference (kJ/mole) between the ground and the first excited state?Generally, the equation for the Energy is mathematically given as
E = nhc / λ
Where
h= plank's constant
h= 6.625x 10-34 Js
c = speed of light
c= 3x 108 m/s
Therefore
E = 1*(6.625x 10-34 Js)( 3x 10^8 m/s) / ( 422.7x10^-9)
E= 4.70x10-22 kJ/mol
In conclusion, Energy
E= 4.70x10-22 kJ/mol
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If 4.0 L of a 4.6 M SrCl2 solution is diluted to 45 L , what is the molarity of the diluted solution
If 4.0 L of a 4.6M SrCl2 solution is diluted to 45L, the molarity of the diluted solution is 0.41M.
How to calculate molarity?The molarity of a diluted solution can be calculated using the following formula:
M1V1 = M2V2
Where;
M1 = initial concentrationM2 = final concentrationV1 = initial volumeV2 = final volumeAccording to this question, 4.0 L of a 4.6M SrCl2 solution is diluted to 45L, the molarity of the diluted solution is calculated as follows:
4.6 × 4 = 45 × M2
18.4 = 45M2
M2 = 18.4/45
M2 = 0.41M
Therefore, if 4.0 L of a 4.6M SrCl2 solution is diluted to 45L, the molarity of the diluted solution is 0.41M.
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A few million years ago, volcanic eruptions caused a large region to be covered by lava. The lava eventually cooled, which resulted in the formation of large amounts of igneous rock. Most of the rock formed was basalt. Today, this region is covered by soil, most of which is a soil known as laterite. Which geologic process caused the rock to change into soil?
A.
deposition
B.
erosion
C.
transportation
D.
weathering
Answer:
D
Explanation:
weathering is the breaking down of physical components through unfavorable weather conditions which can likely cause a change in physical properties
Calculate the grams of C6H6 needed to produce 25 g of CO2
Show your work
Answer:
The given reaction is a combustion reaction of benzene,
C
6
H
6
. From its balanced chemical equation,
2
C
6
H
6
+
15
O
2
→
12
C
O
2
+
6
H
2
O
,
the mass of carbon dioxide
(
C
O
2
)
produced from 20 grams (g) of
C
6
H
6
is determined through the molar mass of the two compounds, given by,
M
M
C
O
2
=
44.01
g
/
m
o
l
M
M
C
6
H
6
=
78.11
g
/
m
o
l
and their mole ratio:
12
m
o
l
C
O
2
2
m
o
l
C
6
H
6
→
6
m
o
l
C
O
2
1
m
o
l
C
6
H
6
With this,
m
a
s
s
o
f
C
O
2
=
(
20
g
C
6
H
6
)
(
1
m
o
l
C
6
H
6
78.11
g
C
6
H
6
)
(
6
m
o
l
C
O
2
1
m
o
l
C
6
H
6
)
(
44.01
g
C
O
2
1
m
o
l
C
O
2
)
=
(
20
)
(
6
)
(
44.01
)
g
C
O
2
78.11
=
5281.2
g
C
O
2
78.11
m
a
s
s
o
f
C
O
2
=
67.6
g
C
O
2
Therefore, the mass in grams of
C
O
2
formed from 20 grams of
C
6
H
6
is
67.6
g
C
O
2
.
it is a problem of app
The grams of C₆H₆ needed to produce 25 g of CO₂ are 7.38g.
What is Mole concept?Avogadro's number is the number of units in one mole of any substance and equals to 6.02214076 × 10²³. The units can be electrons, atoms, ions, or molecules.
No. of moles is defined as a particular no. of particles that we can calculate with the help of Avogadro’s number.
Mass of a particular product is also find out by stoichiometry of a reaction as per the no. of mole given in the reaction.
Given,
Mass of CO₂ = 25g
2C₆H₆ + 15O₂ → 12CO₂ + 6H₂O
As per reaction, 156g of C₆H₆ gives - 528g of CO₂
0.295g of C₆H₆ gives - 1g of CO₂
0.295 × 25 g of C₆H₆ gives - 25g of CO₂ = 7.38g C₆H₆
Therefore, The grams of C₆H₆ needed to produce 25 g of CO₂ are 7.38g.
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NEED HELP ASAP!!! As atmospheric carbon dioxide increases, the amount of carbon dioxide dissolved in the ocean _____.
Question 1 options:
increases
decreases
stays the same
Answer:
If temperature stays the same, the amount of carbon dioxide dissolved in the ocean would increase.
Explanation:
The carbon dioxide in the air ([tex]{\rm CO_{2}}\, (g)[/tex]) and the carbon dioxide dissolved in the ocean ([tex]{\rm CO_{2}}\, (aq)[/tex]) are in a solution equilibrium:
[tex]{\rm CO_{2}}\, (g) \rightleftharpoons {\rm CO_{2}}\, (aq)[/tex].
Assume that the concentration of carbon dioxide in the air ([tex]{\rm CO_{2}}\, (g)[/tex]) increased while temperature stayed the same.
By Le Ch[tex]^{}[/tex]atelier's Principle, the solution equilibrium [tex]{\rm CO_{2}}\, (g) \rightleftharpoons {\rm CO_{2}}\, (aq)[/tex] would shift to offset this increase in [tex]{\rm CO_{2}}\, (g)[/tex] concentration. Specifically, this equilibrium would reduce the amont of [tex]{\rm CO_{2}}\, (g)\![/tex] in the system by converting more atmospheric [tex]{\rm CO_{2}}\, (g)\!\![/tex] to [tex]{\rm CO_{2}}\, (aq)\![/tex] dissolved in the ocean. Therefore, the concentration of [tex]{\rm CO_{2}}\, (aq)\!\![/tex] dissolved in the ocean would increase.
