Answer:
43.40%
Explanation:
(05.03 LC)
How many atoms of hydrogen are there in one molecule of water, if the chemical formula is H2O?
OO
오
01
02 03
Purchasing the correctly sized BMX bike is based on the height of the rider. In order to fit a customer, the salesman can use the equation b=0.29h+1.35 where b is the size of the BMX bike frame in inches and h is the height of the rider in inches.
1. As a rider increases one inch in height, the bike frame increases 0.29 inches.
2. The height of the rider gets multiplied by 0.29.
3. The bike frame increases 0.29 inches for every 1.35 inches of the rider's height.
4. As a rider's height increases 1.35 inches, the bike frame increases one inch.
How much of the 0.2M stock solution of NaCl did you need to make a 100mL
dilution of NaCl at final concentration 0.05M? Please give your answer in units of
MILLILITERS, however do not explicitly include any units in your answer.
The amount of 0.2 M stock NaCl that would be required to make 100 mL, 0.05 M NaCl would be 25 mL
DilutionUsing the equation of dilution:
M1V1 = M2V2
In this case, M1 = 0.2M, V1 = ?, M2 = 0.05 M, V2 = 100 mL
V1 = M2V2/M1
= 0.05 x 100/0.2
= 25 mL
The volume of the stock solution needed is 25 mL
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1. A 35.3 g of element M is reacted with nitrogen to produce 43.5 g of compound M3N2 What is (i) the molar mass of the element and (ii) name of the element?
1. The molar mass of the element M is 40 g/mol
2. The name of the element is calcium (Ca)
Description of mole
The mole an element is related to it's mass and molar mass according to the following equation:
Mole = mass / molar mass
How to determine the mass of nitrogen Mass of M = 35.3 gMass of compound = 43.5 gMass of nitrogen =?Mass of nitrogen = 43.5 – 35.3
Mass of nitrogen = 8.2 g
1. How to determine the molar mass of MMass of nitrogen = 8.2 gMolar mass of nitrogen = 14 g/mol Formula of compound = M₃N₂Mole ratio of M to nitrogen = 3 : 2Mass of M = 35.3 gMolar mass of M = y =?Mole of M : Mole of nitrogen = 3 : 2
35.3 / y ÷ 8.2 / 14 = 3 : 2
(35.3 / y) × (14 / 8.2) = 3 / 2
494.2 / 8.2y = 3 / 2
Cross multiply
8.2y × 3 = 494.2 × 2
24.6y = 988.4
Divide both side by 24.6
y = 988.4 / 24.6
y ≈ 40 g/mol
Thus, the molar mass of the element is 40 g/mol
2. How to determine the name of the element Molar mass of element = 40 g/mol Name of element =?From the periodic table, the element having a mass number of 40 is Argon and Calcium. Since argon will not react with nitrogen to produce Ar₃N₂.
Therefore, we can conclude that the element is calcium since it can react with nitrogen as illustrated by the equation
3Ca + N₂ —> Ca₃N₂
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Please answer this question according to the image below
for the molecule shown below, please answer the following questions.
1. how many carbon atoms are there?
2. how many p-orbitals are involved in π bonds in this molecule?
3. how many Ione pairs of electrons must be added?
4. how many formal positive charges must be added?
When we show the structure of a molecule, we see the arrangement of atoms in the molecule.
Structure of moleculesThe structure of a molecule shows the arrangement of atoms in the molecule.
1) There are 24 carbon atoms in the molecule.
2) There are 30 p- orbitals that are involved in pi bonds in the molecule.
3) We need to add 22 lone pairs of electrons
4) We do not need to add any formal positive charge to the molecule.
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When the volume of a gas is changed from __ mL to 852 mL, the temperature will change from 315 degrees C to 452 degrees C
The volume of a gas is changed from 691 mL to 852 mL, the temperature will change from 315 °C to 452°C.
WHAT IS CHARLES LAW:Charles law states that the volume of a given gas is directly proportional to the temperature given that the pressure remains constant.
The charles law equation is as follows:
V1/T1 = V2/T2
V1/588 = 852/725
588 × 852 = 725V1
500,976 = 725V1
V1 = 500976/725
V1 = 691mL
Therefore, the volume of a gas is changed from 691 mL to 852 mL, the temperature will change from 315 °C to 452°C.
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The wavenumber of the incident radiation in a Raman spectrometer is 20487 cm−1. What is the wavenumber of the scattered Stokes radiation for the J = 2 ← 0 transition of the molecule N2, being the two N atoms the 14 isotope?
The wavenumber of the scattered stokes is 20475.0108cm-1
Data;
wavelength = 20487 cm-1wavenumber = ?Δv = ?Rotational Quantum Numberlet's make
J' = excited rotational quantum number
J" = ground rotational quantum number
B = rotational constant
for
J = 2 -- 0
J' = 2, J" = 0
[tex]\delta V = B * 2*3 - B*0(0+1)\\\delta V = 6B[/tex]
The rotational constant B for N2 = 1.9982 cm-1
[tex]\delta V = 6 * 1.9982 = 11.9892 cm^-^1[/tex]
The wave number of the scattered stokes radiation is given by
[tex]\delta V_s = V_e_x - \delta V[/tex]
substituting all values across
[tex]\delta V_s = 20487 - 11.9892\\\delta V_s = 20475.0108 cm^-^1[/tex]
The wavenumber of the scattered stokes is 20475.0108cm-1
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Suggest why this experimental value is less than the standard enthalpy change of combustion of hexane found in a data book
The standard enthalpy change of combustion of hexane is greater than the experimental value because the combustion of hydrocarbons is not always complete.
What is enthalpy of combustion?The term standard enthalpy of combustion is used to described the heat evolved upon burning one mole of a substance in oxygen under standard conditions.
We must recall that the combustion of hydrocarbons is not always complete as such, the standard enthalpy change of combustion of hexane is greater than the experimental value.
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Using the data in the chart, which of the following would be a correct analysis? x values y values 0 4 1 8 2 16 3 24 The data indicates a direct relationship with a negative slope. The data indicates a direct relationship with a positive slope. The data indicates no particular pattern, which will make it difficult to graph. The data indicates that you would not be able to draw a "best fit" line.
The data indicates a direct relationship with a positive slope.
What is direct relationship?Direct relationship is a type of relation in which if one factor increases the other will also increases and vice versa. This data represents direct relationship because the increase occur in one value causes increase of another value so we can conclude that the data indicates a direct relationship with a positive slope.
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what is nuclear weapons
will mark as brainliest if correct for both questions / chemistry
Answer:
#1 : C
Explanation:
Did you answer question 2 ?
A student correctly determines that 17.1 grams of sucrose are needed to make 50 ml of a 1m sucrose solution. when making the solution in the lab, the student measured 50ml of solution and then adds the 17.1 grams of sucrose to the beaker. the student’s resulting solution was not 1m as intended. after the student mixed the solution, the resulting solution was measured at 62ml.
The initial and final molarity are 0.860 molars and 0.694 molars, respectively.
How to calculate molarity in a solution
In chemistry, molarity ([tex]M[/tex]), in molars, is described by the following expression:
[tex]M = \frac{n}{V}[/tex] (1)
Where:
[tex]n[/tex] - Molar amount of the solute, in moles[tex]V[/tex] - Volume of the solution, in litersThe molar amount of the solute is determined by this formula:
[tex]n = \frac{m}{M}[/tex] (2)
Where:
[tex]m[/tex] - Mass of the solute, in grams[tex]M[/tex] - Molar mass, in moles per gramsIf we know that [tex]m = 17.1\,g[/tex], [tex]M = 397.64\,\frac{g}{mol}[/tex], [tex]V_{1} = 0.050\,L[/tex] and [tex]V_{2} = 0.062\,L[/tex], then the initial and final molarities are, respectively:
[tex]n = \frac{17.1\,g}{397.64\,\frac{g}{mol} }[/tex]
[tex]n = 0.043\,mol[/tex]
Initial molarity[tex]M_{1} = \frac{0.043\,mol}{0.050\,L}[/tex]
[tex]M_{1} = 0.860\,M[/tex]
Final molarity[tex]M_{2} = \frac{0.043\,mol}{0.062\,L}[/tex]
[tex]M_{2} = 0.694\,M[/tex]
The initial and final molarity are 0.860 molars and 0.694 molars, respectively. [tex]\blacksquare[/tex]
RemarkThe statement is incomplete, complete form is described below:
A student correctly determines that 17.1 grams of sucrose are needed to make 50 ml of a 1m sucrose solution. when making the solution in the lab, the student measured 50ml of solution and then adds the 17.1 grams of sucrose to the beaker. the student’s resulting solution was not 1m as intended. after the student mixed the solution, the resulting solution was measured at 62ml. What are the initial and final concentrations of the solution?
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Question 5(Multiple Choice Worth 5 points)
(01.02 LC)
A chemist reported that 100 gallons of a gas were available in a laboratory. Which property of the gas did the chemist report?
O Length
O Mass
O Temperature
O Volume
Answer:
volume
Explanation:
this is because gallon is a unit of volume.
pls give brainliest
The property of the gas that was used by the chemist's report is volume. The correct option is D.
What is volume?
Volume is a scalar quantity that is used to measure the space occupied by a three-dimensional object. In terms of liquid and gas, the volume is measured as the capacity of the container that contains a liquid.
Gas is a state of matter that has no regular shape and no fixed volume. They have the lowest density and their moles are farthest from each other.
Gallon is a unity of volume that is used in the metric system of the United States. There are 100 gallons of gas in the container, the volume of gas is the total number of moles of the gas in a container.
Thus, the correct option is D. Volume.
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Hey!!! Chemistry Question about MOLES... Please help...
When ethane (C2H6) burns, it produces carbon dioxide and water:
2C₂ H₆ (g) + 7O₂ (g) → 4CO₂ (g) + 6H₂ O (1)
How many moles of water will be produced when 16 moles of ethane are burned?
Answer:
48 moles of water
Explanation:
2C2H6 + 7O2 --> 4CO2 + 6H2O
We want to find the number of moles of water produced if 16 moles of ethane (C2H6) are burned.
We can use dimensional analysis to find the answer.
Needed conversions: We need the mole ratio of ethane to water in the chemical equation which would be 2 to 6. So for every 2 moles of ethane that are burned 6 moles of water is produced.
Using this ratio we can create a table:
[tex]\frac{16mol(C_2H_6)}{} *\frac{6mol(H_2O)}{2mol(C_2H_6)}[/tex]
the mol (C2H6) cancel out and we get
[tex]\frac{16}{} *\frac{6}{2mol(C_2H_6)}[/tex]
we then multiply
16 * 6/2molC2H6 = 48molH2O
So if 16 moles of ethane is burned 48 moles of water is produced
Help me out ? I'm not sure of my answer.
Answer: It is possible. Chlorine reacts with potassium bromide to form potassium chloride and bromine.
A chemist weighed out 8.72 g of tin. Calculate the number of moles of tin she weighed out.
Be sure your answer has the correct number of significant digits.
Given the empirical formula C2H3O, what is the molecular formula that has a mass of 214.8g?
Given the empirical formula, the molecular formula that has a mass of 214.8g is C₁₀H₁₅O₅
Empirical & ,molecular formulaeFrom the question, we are to determine the molecular formula
From
Molecular formula = (Empirical formula)n
Where
[tex]n = \frac{Molecular\ formula\ mass}{Empirical\ formula\ mass}[/tex]
From the given information,
Empirical formula is C₂H₃O
Therefore, Empirical formula mass = (12×2) + (1×3) + (16)
Empirical formula mass = 24 + 3 + 16
Empirical formula mass = 40 g
Then,
[tex]n = \frac{214.8}{40}[/tex]
n = 5.37
n ≅ 5
Therefore,
Molecular formula = (C₂H₃O)₅
Molecular formula = C₁₀H₁₅O₅
Hence, given the empirical formula, the molecular formula that has a mass of 214.8g is C₁₀H₁₅O₅
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If a gas is initially at a pressure of 1.56 atm and has a volume of 556 mL, what is the pressure if the balloon is compressed to a volume of 224 mL
Answer:
The answer for the final volume is essentially the same if we converted the 1,775 torr to atmospheres: Using Boyle's law: (1.56 atm)(7.02 L) = (2.335 atm) × V f; 02 L) 2 . 336 at
Walruses live in very cold regions. Unlike many animals that live in cold regions, walruses do not have a thick coat of fur to insulate their bodies and keep them warm. Which of the following characteristics most likely allows the walrus to survive in extremely cold temperatures? A. Walruses store fat and have a thick layer of blubber. B. Walruses have short, bristled whiskers on their faces. C. Walruses have an air sac in their throats that allows them to float in water. D. Walruses have two tusks that can grow to over a meter long.
Answer:
d is the right anwer
Explanation:
What does how much you weigh depend upon?
how many calories your body burns each day
both a and b
neither a nor b
how many calories you eat each day
Answer:
1. It depends on the object's mass and the acceleration due to gravity, which is 9.8 m/s2 on Earth.
2. The average person burns around 1800 calories a day doing absolutely nothing. According to the Healthy Eating Guide, sitting burns an estimated 75 calories per hour.
3. (Adults). The recommended calorie intake for adult women ranges from 1,600 calories per day to 2,400 calories per day, according to the 2020-2025 Dietary Guidelines for Americans. 2 For men, the amount is slightly higher, ranging from 2,200 to 3,200 calories per day.
Explanation:
mark me as brainliest
Answer:
both of these
Explanation:
i just did the test
which weather would create the largest surfing waves?
Answer:
I think It Is C
Explanation:
Im really sry if i am wrong
The reaction
C(s)+2H2(g)⇌CH4(g)
has p=0.263 at 1000. K. Calculate the total pressure at equilibrium when 4.553 g of H2 and 22.14 g of C(s) are placed in an 8.89 L flask and heated to 1000. K.
Ptotal=______ atm
From he calculations, we can see that the total pressure at equilibrium is 21 atm.
What is equilibrium constant?The term equilibrium constant commonly describes the constant that that shows the extent of conversion of reactants to products.
We have to find the pressure of each gas as follows;
For H2
P = nRT/V = 4.553 /2 × 0.082 × 1000/8.89 L = 21 atm
Using the ICE table;
C(s) + 2H2(g) ⇌ CH4(g)
I 21 atm 0
C -x +x
E 21 - x x
0.263= x/(21 - x )^2
0.263(21 - x )^2 = x
38 - 11x - 0.263x^2 = x
0.263x^2 + 12x - 38 = 0
x=2.97 atm
At equilibrium, we have;
(21 - 2.97) + 2.97 = 21 atm
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Best definition of chemistry
Answer:
its a branch of science which deals with chemical and atomaic molecules
Answer:
Chemistry is the study of matter, it properties and the changes that matter undergoes.
What is the name for Mg2PO3?
How many joules of heat are needed to raise the temperature of 18.3 g of aluminum from
25°C to 70°C, if the specific heat of aluminum is 0.90 J/gºC?
Answer:
The key to this problem lies with aluminium's specific heat, which as you know tells you how much heat is needed in order to increase the temperature of 1 g of a given substance by 1∘C.
In your case, aluminium is said to have a specific heat of 0.90Jg∘C.
what is the mass number of chlorine
Answer:
35.453 u
Explanation:
Hope this helps
classify N a + as cation, anion or neither
How much oil has been removed and how much is left?
Answer: 50(removed) 210(still in)
Explanation: just count it
What threatens the health of coral reefs? (Select all that apply.) increased diversity of coral polyp species coastal land development silt runoff ocean water pollution damage from scuba diving, boating, and fishing
Corals are a key part of world's diversity .
I have done the quiz so here is the answer:
coastal land development
ocean water pollution.
damage from scuba driving, boating and fishing.