Answer: The mole fraction of chloroform in this solution is 0.41
Explanation:
To calculate the moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}[/tex]
a) moles of [tex]CHCl_3[/tex]
[tex]\text{Number of moles}=\frac{49g}{119g/mol}=0.41moles[/tex]
b) moles of [tex]CH_3COBr[/tex]
[tex]\text{Number of moles}=\frac{73g}{123g/mol}=0.59moles[/tex]
To calculate the mole fraction, we use the formula:
[tex]\text{Mole fraction of a component}=\frac{\text{Moles of the component}}{\text{total moles}}[/tex]
[tex]\text{Mole fraction of chloroform}=\frac{\text{Moles of chloroform}}{\text{total moles}}=\frac{0.41}{0.41+0.59}=0.41[/tex]
The mole fraction of chloroform in this solution is 0.41
water vapour is the solid form of water.
True
False
Answer and I will give you brainiliest
Answer:
False
Explanation:
Water vapour exists in gas phase!
Aton Van Leeuwenhoek was the first scientist to discover prokaryotic organisms. These single-celled organisms lack a nucleus and other membrane bound organelles but do have a cell membrane, DNA, and even a cell wall. Choice one of the answer. A. All known living things are made up of one or more cells. B. All living cells come from pre-existing cells by division. C. A cell is the fundamental unit of structure and function in all living organisms. D. No answer text provided
Answer: a
Explanation:
List all possible oxidation numbers for the elements. 21. Al
22. Bi
23. Ni
24. Xe
25. Pb
Answer:
21. Al (Aluminium)
+3 (most common), -1, -2, +1, +2
22. Bi (Bismuth)
+3 (most common), -3, -2, -1, +1, +2, +4, +5
23. Ni (Nickel)
+2 (most common), -2, -1, 0,+1, +3, +4
24. Xe (Xenon)
0 (most common), +1, +2, +4, +6, +8
25. Pb (Lead)
+2 (most common), +4 (most common), -4, -2, -1, +1, +3
Explanation:
Now we proceed to present the answers for each element:
21. Al (Aluminium)
+3 (most common), -1, -2, +1, +2
22. Bi (Bismuth)
+3 (most common), -3, -2, -1, +1, +2, +4, +5
23. Ni (Nickel)
+2 (most common), -2, -1, 0,+1, +3, +4
24. Xe (Xenon)
0 (most common), +1, +2, +4, +6, +8
25. Pb (Lead)
+2 (most common), +4 (most common), -4, -2, -1, +1, +3
If a gas effuses 2.17 times faster than Xe, what is its molar mass?
Answer:
Molar mass = 27.88 g/mol
Explanation:
The relationship between how gases effuses is given by Graham's law of effusion. This law is given as;
Rg / Rxe = [tex]\sqrt{}[/tex](Mxe / Mg)
Where;
Rg = Rate of effusion of gas g
RXe = Rate of effusion of Xe
Mxe = Molar mass of Xe = 131.29 g/mol
Mg = Molar mass of gas g
From the question;
Rg : Rxe = 2.17 : 1
Rg / Rxe = 2.17 / 1 = 2.17
2.17 = [tex]\sqrt{}[/tex]131.29 / Mg
Squaring both sides
4.7089 = 131.29 / Mg
Mg = 131.29 / 4.7089
Mg = 27.88 g/mol
A solution with a pH value between 1 and 6
Answer:
One possible answer could be lemon juice
Explanation:
We had to do a water test, and I was looking up what pH levels were. Then I learned about it in school, so I know a thing or two about it :)
Possible other answers include stomach acid and cola.
Hope this helps!!
Which of the following is NOT an advantage of a wireless network? convenience reliability security speed
Answer:
Security
Explanation:
A wireless network consists of good connection with fast speed, convenience, and reliability. Security is a major problem with wireless connection as someone can get your information by joining the same connection as you.
A 600. mL beaker has an inner diameter of 77.0 mm. What is the vertical distance between the 100. mL marks on the side of the beaker
Answer:
[tex]h=12.9cm[/tex]
Explanation:
Hello!
In this case, since we can consider the beaker until the 100-mL mark as a cylinder, we can use the following equation to relate its diameter, vertical distance or height and volume:
[tex]V=\pi h\frac{d^2}{4}[/tex]
Thus, since we know the diameter, volume (which is equivalent to 600 cm³) and π, we can plug in to obtain:
[tex]600cm^3=\pi *h*\frac{(77.0mm)^2}{4}[/tex]
It means it is necessary to take the mm to cm and solve for h:
[tex]h=\frac{600cm^3}{\pi*\frac{(7.70cm)^2}{4}} \\\\h=12.9cm[/tex]
Best regards!
The distance between each 100 mL mark is 2.15 cm.
The volume of a cylinder is obtained using the formula;
V = πr^2h
Now, we have the following information;
Volume of the cylinder = 600. mL or 600 cm^3
Diameter of the cylinder = 77 mm or 7.7 cm
Radius of the cylinder = 7.7/2 = 3.85 cm
Height of the cylinder = h
Hence;
600 = 3.142 × ( 3.85 )^2 × h
h = 600/3.142 × ( 3.85 )^2
h = 12.88 cm
There are six 100 mL marks on the beaker, the distance between each 100 mL mark = 12.88 cm/6 = 2.15 cm
Learn more about volume: https://brainly.com/question/12748872
A mixture of ethyne gas (C2H2) and methane gas (CH4) occupied a certain volume at a total pressure of 16.8 kPa. When the sample burned, the products were CO2 gas and H2O vapor. The CO2 was collected and its pressure found to be 25.2 kPa in the same volume and at the same temperature as the original mixture. What percentage of the original mixture was methane
Answer:
50%
Explanation:
Let assume that there are:
"a" moles of CH4 & "b" moles of C2H2
Then by applying the ideal gas equation:
PV = nRT
[tex]16.8 \times 10^3 \times V = (a+b)RT[/tex]
Make (a+b) the subject of the formula:
[tex](a+b) = \dfrac{16800 \ V }{RT} mol[/tex] --- (1)
Since 1 mole of CH₄ yields 1 mol of CO₂ & 1 mol of C₂H₂ yields 2 moles of CO₂
Then;
the total moles of CO₂ = (a +2b)
Now:
[tex]25.3 \times 10^3 \times V = (a+ 2b)RT[/tex]
[tex](a + 2b) = \dfrac{25200 \ V}{RT \ mol}[/tex] ---- (2)
∴
By solving the above equations
[tex]a = \dfrac{8400 \ V}{RT} \\ \\ b = \dfrac{8400 \ V}{RT}[/tex]
Hence, the estimate of the percentage of methane in the original mixture is:
[tex]= 100 \times \dfrac{a}{(a+b)}[/tex]
[tex]= 100 \times \dfrac{8400\dfrac{ \ V}{RT} }{8400\dfrac{ \ V}{RT} + 8400\dfrac{ \ V}{RT}}[/tex]
= 50%
What are the rows of the periodic table called?
Answer:
"The elements are arranged in seven horizontal rows,called periods or series,and 18 vertical columns,called Groups."
Explanation:
Risk*
please explain energy flow from producer to consumer.
and please explain energy flow from consumer to consumer.
Answer:
1-Ecologists call this one-way flow of matter and energy from a producer to a primary, then to secondary, and perhaps to a tertiary consumer, a food chain. The food web shows all the organisms at each feeding level or trophic level.
2-Energy flows through an ecosystem in one direction: from producer to primary consumer to secondary consumer to higher consumers. A biomass pyramid provides a picture of the feeding and energy relationships within a food web and the direction of the flow of energy.
Answer:
food
Explanation:
How many electrons will the lithium atom give up to become stable?
a. 1
b. 2
c. 3
d. 4
Answer: 2
Explanation: that’s the answer for the quiz
How many moles of each element are in one mole of Sr(HCO,),? (3 points)
O 1 mole of strontium, 1 mole of hydrogen, 1 mole of carbon, 5 moles of O
O1mole of strontium, 2 moles of hydrogen, 2 moles of carbon, 6 moles of O
O 2 moles of strontium, 2 moles of hydrogen, 2 moles of carbon, 5 moles of O
O2 moles of strontium, 2 moles of hydrogen, 2 moles of carbon, 6 moles of O
Answer: 1 mole of strontium, 2 moles of hydrogen, 2 moles of carbon, 6 moles of O
Explanation: i think i’m not sure
A mole corresponds to the mass of a substance that contains particles of the substance.
The concept of moles are used in various ways:-
Chemical equation. Law of constant proportion.
According to the question, the formula required is:-
[tex]n=\frac{Number\ of\ molecules}{na}[/tex]
The Na is defined as the Avogadro constant is the proportionality factor that relates the number of constituent particles in a sample with the amount of substance in that sample.
According to the question, the compound is [tex]Sr(HCO_{3})_{2}[/tex].
Hence the correct option is 2, that is 1 mole of strontium, 2 moles of hydrogen, 2 moles of carbon, 6 moles of oxygen.
For more information, refer to the link:-
https://brainly.com/question/19968870
pleaseee help thank youu
Answer:
i just took it the answers is C
Explanation:
What element contains 8 valence electrons and tends not to react with other elements?
Answer:
C. Oxygen
Explanation:
Oxygen has 8 electrons and doesn't react with fluorine noble gases
Use the following reaction:
CuCl2 + 2 NaNO3 → Cu(NO3)2 + 2 NaCl
If 90.0 grams of copper (II) chloride react with 120.0 grams of sodium nitrate, how much sodium chloride can be formed (in grams)?
Answer:
78.4g
Explanation:
Given parameters:
Mass of copper (II) chloride = 90g
Mass of sodium nitrate = 120g
Unknown:
Mass of sodium chloride that can be formed = ?
Solution:
The balanced chemical reaction is:
CuCl₂ + 2NaNO₃ → Cu(NO₃)₂ + 2NaCl
Let us find the limiting reactant. This reactant will determine the extent of the reaction of the amount of product that will be formed.
First, convert the masses to number of moles;
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Molar mass of CuCl₂ = 63.5 + 2(35.5) = 134.5g/mol
Molar mass of NaNO₃ = 23 + 14 + 3(16) = 85g/mol
Number of moles of CuCl₂ = [tex]\frac{90}{134.5}[/tex] = 0.67mole
Number of moles of NaNO₃ = [tex]\frac{120}{85}[/tex] = 1.41mole
From the balanced reaction equation:
1 mole of CuCl₂ would react with 2 moles of NaNO₃
0.67mole of CuCl₂ would require 0.67 x 2 = 1.34mole of NaNO₃
So, CuCl₂ is the limiting reactant
1 mole of CuCl₂ will produce 2 mole of NaCl
0.67mole of CuCl₂ will therefore yield 0.67 x 2 = 1.34mole of NaCl
Mass of NaCl = number of moles x molar mass
Molar mass of NaCl = 23 + 35.5 = 58.5g/mol
Mass of NaCl = 58.5 x 1.34 = 78.4g
The concentration of hydrogen peroxide solution can be determined by
titration with acidified potassium manganate(VII) solution. In this reaction
hydrogen peroxide is oxidised to oxygen gas. A 5.0 cm sample of hydrogen
peroxide solution was added to a volumetric flask and made to 250 cm
of the aqueous solution. A 25.0 cm sample of this solution was acidified
and reacted completely with 24 35 em of 0.0187 mol dm potassium
manganate(VII) solution
(ay Write a balanced equation for the reaction between acidified KMnO
solution and H.O.
(b) Calculate the concentration of the original H,O, solution in mol dm
The question is incomplete, the complete reaction equation is;
The concentration of a hydrogen peroxide solution can be determined by titration
with acidified potassium manganate(VII) solution. In this reaction the hydrogen
peroxide is oxidised to oxygen gas.
A 5.00 cm3 sample of the hydrogen peroxide solution was added to a volumetric flask
and made up to 250 cm3 of aqueous solution. A 25.0 cm3 sample of this diluted
solution was acidified and reacted completely with 24.35 cm3 of 0.0187 mol dm–3
potassium manganate(VII) solution.
Write an equation for the reaction between acidified potassium manganate(VII)
solution and hydrogen peroxide.
Use this equation and the results given to calculate a value for the concentration,
in mol dm–3, of the original hydrogen peroxide solution.
(If you have been unable to write an equation for this reaction you may assume that
3 mol of KMnO4 react with 7 mol of H2O2. This is not the correct reacting ratio.)
Answer:
2.275 M
Explanation:
The equation of the reaction is;
2 MnO4^-(aq) + 16 H^+(aq) + 5H2O2(aq) -------> 2Mn^+(aq) + 10H^+ (aq) + 8H2O(l)
Let;
CA= concentration of MnO4^- = 0.0187 mol dm–3
CB = concentration of H2O2 = ?
VA = volume of MnO4^- = 24.35 cm3
VB = volume of H2O2 = 25.0 cm3
NA = number of moles of MnO4^- = 2
NB = number of moles of H2O2 = 5
From;
CAVA/CBVB = NA/NB
CAVANB = CBVBNA
CB = CAVANB/VBNA
CB = 0.0187 * 24.35 * 5/25.0 * 2
CB = 0.0455 M
Since
C1V1 = C2V2
C1 = initial concentration of H2O2 solution = ?
V1 = initial volume of H2O2 solution = 5.0 cm3
C2 = final concentration of H2O2 solution= 0.0455 M
V2 = final volume of H2O2 solution = 250 cm3
C1 = C2V2/V1
C1 = 0.0455 * 250/5
C1 = 2.275 M
Elements in the same group of the periodic table have the same number of
Answer:
valence electrons
The elements in each group have the same number of electrons in the outer orbital. Those outer electrons are also called valence electrons. They are the electrons involved in chemical bonds with other elements. Every element in the first column (group one) has one electron in its outer shell.
PLEASE HELP WILL MARK BRAINLIEST
how does the container with the plastic wrap stimulate carbon dioxide in the atmosphere?
Answer:
The Earth’s greenhouse effect is a natural consequence of the chemical makeup of its atmosphere. If it
were not for the greenhouse effect, life as we know it could not exist on Earth: it would be too cold. Our
atmosphere is made mostly of nitrogen and oxygen, but also contains several other gases. These include
carbon dioxide, methane, nitrous oxide, water vapor and ozone, which are known as greenhouse gases.
Greenhouse gases are released naturally through geologic processes and the metabolic activity of living
things. However, there is an ongoing debate over human effects on Earth’s global climate. Human industrial activity on the planet has increased the quantities of greenhouse gases through agriculture, manufacturing, power generation, and engines used for transportation. Key questions include: Is the average temperature of Earth increasing? Does the presence of human beings contribute to global warming? If the temperature of Earth does become warmer, how will it affect us?
Explanation:
QUESTION 3 What mass (in g) of glucose, C6H1206, must be added to 300.7 g of water to prepare a 0.322 molal solution? Enter your answer with 3 significant figures and no units.
Answer:
17.42 g of glucose, C₆H₁₂O₆
Explanation:
From the question given above, the following data were obtained:
Mass of water = 300.7 g
Molar solution = 0.322 M
Mass of glucose =.?
Next, we shall convert 300.7 g to L. This can be obtained as follow:
1000 g = 1 L
Therefore,
300.7 g = 300.7 g × 1 L / 1000 g
300.7 g = 0.3007 L
Next, we shall determine the number of mole of glucose in the molar solution. This can be obtained as follow:
Volume of solution = 0.3007 L
Molar solution = 0.322 M
Mole of glucose =?
Molar solution = mole / Volume
0.322 = mole of glucose / 0.3007
Cross multiply
Mole of glucose = 0.322 × 0.3007
Mole of glucose = 0.0968 mole
Finally, we shall determine the mass of glucose, C₆H₁₂O₆, needed to produce prepare the solution. This can be obtained as follow:
Mole of C₆H₁₂O₆ = 0.0968 mole
Molar mass of C₆H₁₂O₆ = (12×6) + (1×12) + (16×6)
= 72 + 12 + 96
= 180 g/mol
Mass of C₆H₁₂O₆ =?
Mole = mass /Molar mass
0.0968 = Mass of C₆H₁₂O₆ / 180
Cross multiply
Mass of C₆H₁₂O₆ = 0.0968 × 180
Mass of C₆H₁₂O₆ = 17.42 g
Thus, 17.42 g of glucose, C₆H₁₂O₆ is needed to prepare the molar solution.
QUESTION 4
How many significant figures are in the number 0.000020?
O A. 1
OB.2
O C.3
OD.4
Answer:
B) 2
Explanation:
There are two significant figures in given measurement,
2, 0
Significant figures:
1= The given measurement have four significant figures 1534.
2= All non-zero digits are consider significant figures like 1, 2, 3, 4, 5, 6, 7, 8, 9.
3= Leading zeros are not consider as a significant figures. e.g. 0.03 in this number only one significant figure present which is 3.
4= Zero between the non zero digits are consider significant like 107 consist of three significant figures.
5= The zeros at the right side e.g 2400 are also significant. There are four significant figures are present.
What is one reason a fuse may blow out? NEED HELP NOW
Answer:
Too high voltage which can't be held by the fuse
Prokaryotic is an example of a/an-
A:tissue
B:cell type
C:organ
D:organism
Answer:
B. Cell Type
Explanation:
that is the answer i believe
Answer:
option b- cell type
Explanation:
almost absolutely positive
GIVING OUT BRAINLIEST!!!!!!!!!
Which substance has the lowest specific heat?
O Beach sand
O
Beach water
O Ice
Pool water
Which of these factors are biotic? (SELECT ALL THAT APPLY.)
animals
light
minerals
water
plants
Answer:
plants
Explanation:
because it produces ( i am a third grade student and don't know if it is right or not)
As ice cream freezes do the chemical properties of the substance change? Explain why or why not?
How many atoms are in .938 moles of CO2?
Answer: 1.695x10^24 atoms
Explanation: 0.938 moles CO2 = 0.938xavogadro number molecules CO2, so number of atoms = 3x0.938x6.02214076x10^23 = 1.695x10^24
___C3H8 + ___O2 --> ___H2O + ___CO2
Answer:
C3H8 + 5O2 ‐‐‐‐‐‐‐‐> 4H2O + 3CO2
Why is your body going through physical and chemical changes?
Answer:
Physical and chemical changes can occur almost everywhere, even in our bodies! Food must be broken down into a form that our cells can use. When we eat, our bodies physically break down food into small pieces. Our bodies also chemically break down those small pieces of food into tiny organic molecules.
Explanation:
A sample of limestone (calcium carbonate, CaCO3) is heated at 950 K until it is completely converted to calcium oxide (CaO) and CO2. The CaO is then all converted to calcium hydroxide by addition of water, yielding 8.47 kg of solid Ca(OH)2. Calculate the volume of CO2 produced in the first step, assuming it to be an ideal gas at 950 K and a pressure of 0.976 atm.
Answer:
Therefore, volume of CO₂ produced in the first step is 9141.404 L
Explanation:
Equations of reactions:
A: CaCO₃(s) ---> CaO(s) + CO₂(g)
B: CaO(l) + H₂O(l) ---> Ca(OH)₂(s)
Molar mass of CaCO₃ = 100 g; molar mass of CaO = 56 g; molar mass of CO₂ = 44 g molar mass of H₂P = 18 g; molar mass of Ca(OH)₂ = 74 g
From equation B, 1 mole of CaO produces 1 mole of Ca(OH)₂
This means that 56 g of CaO produces 74 g of Ca(OH)₂
mass of CaO that produces 8.47 kg or 8470 g of Ca(OH)₂ = 8470 g * 56/74 = 6409.73 g of CaO
Therefore, 6409.73 g of CaO were produced in reaction A
From reaction A, 1 mole of CaCO₃ produces 1 mole CaO and 1 mole of CO₂
Number of moles of CaO in 6409.73 g = 6409.73 g/56 g/mol = 114.46 moles
Therefore, 114.46 moles of CO₂ were produces as well.
Molar volume of gas at STP = 22.4 litres
Volume of CO₂ produced at STP = 114.46 * 22.4 L =2563.904 L
However, the above reaction took place at 950 K and 0.976 atm, therefore volume of CO₂ produced under these conditions are obtained using the general gas equation
Using P₁V₁/T₁ = P₂V₂/T₂
P₁ = 1.0 atm, V₁ = 2563.904 L, T₁ = 273 K, P₂ = 0.976 atm, T₂ = 950 K, V₂ = ?
V₂ = P₁V₁T₂/P₂T₁
V₂ = (1.0 * 2563.904 * 950)/(0.976 * 273)
V₂ = 9141.404 L
Therefore, volume of CO₂ produced in the first step is 9141.404 L
Please help!!! The person who gets it right gets brainlist
Answer:B because all of the atoms exploded AND GRAVITY WAS CREATED AND forced molecules together (God caused it btw)
Explanation:The BIBLE