0.28 moles of nitrogen gas are there in 6.8 liters at room temperature and pressure (293 K and 100 kPa).
Ideal gas law :
An ideal gas is a gas in which atoms dose not exert any force on each other even after collision which walls and other atoms (inelastic collisions).
Mole definition:
The mole is the amount of compound present in a given system which has molecular mass as that of the mass of carbon12 .carbon 12
Using ideal gas law ,
PV=nRT
Given,
pressure = P = 100kPa
Volume = V = 6.8 Lit
Temperature = room temperature = T = 293 K
R= universal gas constant = 8.314
n= moles = ?
∴[tex]n = \frac{PV}{RT}[/tex]
∴ n = 100 × 6.8 / 8.314 × 293
∴n = 0.28 moles
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Mass of hydrated copper sulfate in CuSo4.5H2O
Answer: Molar mass of [tex]CuSO_4.5H_2O[/tex] is 249.68 g/mol.
Explanation:
Molar mass is the mass of 1 mole of the molecule. It is calculated by adding masses of all the atoms in the given molecule.
[tex]CuSO_4.5H_2O[/tex] contains one atom of copper , 1 atom of sulphur, 9 atoms of oxygen and 10 atoms of hydrogen
Mass of copper = 63.5 g/mol
Mass of sulphur = 32.06 g/mol
mass of oxygen = 16.00 g/mol
Mass of hydrogen = 1.008 g/mol
Thus mass of [tex]CuSO_4.5H_2O[/tex] = 63.5(1)+32.06(1)+16.00(9)+1.008(10)=249.68 g
Molar mass of [tex]CuSO_4.5H_2O[/tex] is 249.68 g/mol.
Which substance is one that cannot be separated or broken down into simpler substances by chemical means? (Element, pure)
table salt (NaCl)
gold wire (Au)
candle wax (CH2O)
water vapor (H2O)
Answer:
gold wire (Au)
Explanation:
A substance that cannot be separated or broken down into simpler substances by chemical means is an element.
Between the given options only gold wire is an element, Au.
A way of knowing that it is an element is noticing that its formula is a single symbol which corresponds to an element found in the periodic table, unlike a combination of said symbols (like NaCl or H₂O).
If each water molecule contains 2 hydrogen atoms, how many total oxygen atoms in 20 water molecules?
10
20
40
60
What element does Ca-37 turn into when it gives off radiation?
K-37
K-39
Sc-37
Sc-45
Is this the correct formula for magnesium acetate? Mg(C2H3O)2
Answer:
no
Explanation:
magnesium acetate= Mg(C2H3O2)2
MQ : Which parts of the brain had most likely been affected?
Answer:
the cerebrum
Explanation:
answer is A
How to make 0.01 Molar solution in 30 ml of water
Answer:
You see the concentration decreased ten fold, from 1 M to 0.1 M.
You can simply increase the volume by ten times.
For example
If you have 250 mL of 1 molar HCl, you can add distilled water upto 2500 mL. Now the concentration is 0.1 molar.
If you want to use the serial dilution method, you can use the C1V1=C2V2 equation.
C1 = starting concentration.
C2 = final concentration.
V is for volume.
So let's say you have 500 mL of 1 M HCl and you only want 50 mL of 0.1 M HCl.
1 M x V1 = 0.1 M x 50 mL
V1 = 5 mL
So you take 5 mL of the original (stock) solution and dilute it up to 50 mL. Then you have 50 mL of 0.1 M HCl.
Explanation:
The reaction for luminol is basically luminol and hydrogen peroxide. In the instructions for the preparation of the chemicals, I found that the hydrogen peroxide is 44 times more concentrated than the luminol. The fact that there are two reactants, should make you wonder if the reaction is second order overall. However, in class, we presented data that showed that the natural log of the amount of light change over time was a straight line with a negative slope. This would tend to make you think that the reaction is first order, given the information here, you can confidently say that this reaction is:
A. zeroth order
B. first order
C. pseudo first order
D. second order
E. third order
Answer:
pseudo first order
Explanation:
We know that for a first order reaction, the plot of the natural log of the amount of reactant against time is a straight line with a negative slope. In this case the amount of substance is monitored using the amount of light change. Hence, the plot of the natural log of the amount of light change against time was a straight line with a negative slope.
The statement above characterizes a first order reaction. However, we must remember that the reaction is bimolecular; it involves luminol and hydrogen peroxide. The hydrogen peroxide is 44 times more concentrated than the luminol making the reaction a pseudo first order reaction.
A Pseudo first-order reaction can be defined as a second-order or bimolecular reaction that is made to behave like a first-order reaction(Byjus).
what causes the different crusts to rise and lower?
Answer:
tectonic plates
Explanation:
Arrange the liquids pentane (CH3CH2CH2CH2CH3), pentanol (CH3CH2CH2CH2CH2OH), and pentanal (CH3CH2CH2CH2CHO) in order of decreasing viscosity, surface tension, and boiling point.
Rank from highest to lowest viscosity, surface tension, and boiling point.
Answer:
Following are decreasing order to this question:
Explanation:
Viscosity and surface tension both are inter-molecular by nature (IMFs)
The pentane becomes non-polar and just not H-bondable, so LDF alone would be likely (London Dispersion Force)
Pentanal, but H-bond => is impossible (Dipole-Dipole)
Pentanol is also an OH group, so H-bond => is probable (Hydrogen Bonding)
Higher air tension and viscosity than higher IMFs (because the atoms of fluids are more drawn). To lower the IMF (and therefore the viscosity/surface stress decreases)
pentanol
pentanal
pentane
A flask at room temperature contains exactly equal amounts (in moles) of nitrogen and xenon.
a. Which of the two gases exerts the greater partial pressure?
b. The molecules or atoms of which gas have the greater average velocity?
c. The molecules of which gas have the greater average kinetic energy?
d . If a small hole were opened in the flask, which gas effuses more quickly?
Answer:
a) Same
b) Nitrogen
c) Same
d) Nitrogen
Explanation:
a)
The formula for partial pressure of a gas is equal to
[tex]p_B = n_B \frac{RT}{V}[/tex]
Here nB is the number of moles .
The number of moles for both the gases are same and hence the partial pressure for the two gases will also be same.
b) The greater average velocity is calculated by using following formula
[tex]v_{RMS} = \sqrt{3RTM}[/tex]
Here M is the molar mass.
Molar mass of nitrogen is greater than the molar mass of xenon and hence nitrogen will have higher greater average velocity
c) As we know, the average kinetic energy of gas particles is dependent on the absolute temperature of gas and if all the gases are at same temperature, their kinetic energy will also be same. Since nitrogen and xenon are at same temperature, their kinetic energy will be same
d) Effusivity is depended directly on the thermal conductivity, density and and the specific heat capacity.
All these three parameters are higher in case of nitrogen. Thus, it will effuse first
5.6 g of an organic compound on burning with excess
of oxygen gave 17.6 g of CO2, and 7.2 g of H,O. The
organic compound is :
Answer:organic compound is : C₄H₈
Explanation: The equation of the reaction of the organic compound burning with excess oxygen gives us the general equation as
C xHy + 1/2(x+ y/2 )O₂ → xCO₂ + y/2H₂O
We first find the number of moles of CO₂ and H₂O
Number of moles of CO₂= Mass/ molar mass
= 17.6g/ 44g/mol ( 12+ 16 x2)
=0.4 moles
Number of moles of H₂O= Mass/ molar mass
= 7.2g/ 18g/mol ( 1 X 2+ 16)
=0.4 moles
From the reaction , we can see that
x = 0.4
and [tex]\frac{y}{2}[/tex]= 0.4 such that y= 0.4 x 2= 0.8
Their ratios become
[tex]\frac{x}{y}[/tex] =[tex]\frac{0.4}{0.8}[/tex]= [tex]\frac{4}{8}[/tex]
Therefor the organic compound CxHy = C₄H₈
What specifically causes the vaporization of the lower boiling liquid on the packing in a fractional distillation
Answer:
Fractional distillation works because the various liquids have different points of boiling. When heating the mixture: As they enter a column below their boiling point temperature, vapors condense. Fluid flows from the column
Explanation:
Convert Fahrenheit temperature
to Kelvin scales
Answer:
K = (F – 32)5/9 + 273.15
Explanation:
You basically convert Fahrenheit to Celcius and then to Kelvin
Here's the entire formula:
K = (x °F – 32)5/9 + 273.15
if an atom has 22 protons 28 neutrons 20 electrons what would its atomic number be
Answer:
22
Explanation:
The atomic number indicates the amount of protons, so it would be 22
There are two isotopes of an unknown element, X-19 and X-21. The abundance of X-19 is 14.55%. A weighted average uses the percentages of each isotope to scale their contribution to the total mass. Each isotope's contribution is the percentage (in decimal form) multiplied by the mass of the isotope. What is the contribution (in amu) to the weighted average from the X-19 isotope, which has a mass of 19.00 amu
Answer:
2.765amu is the contribution of the X-19 isotope to the weighted average
Explanation:
The average molar mass is defined as the sum of the molar mass of each isotope times its abundance. For the unknown element X that has 2 isotopes the weighted average is defined as:
X = Mass X-19 * Abundance X-19 + MassX-21 * Abundance X-21
The contribution of the X-19 isotope is its mass (19.00 amu) times its abundance (14.55% = 0.1455). That is:
19.00amu * 0.1455 =
2.765amu is the contribution of the X-19 isotope to the weighted average
an alloy is a metal that has?
An alloy always has two or more elements/metals in it. An alloy always has at least metal in it.
Steels have iron and carbon in it. Bronze is copper and tin, or aluminum, or manganese, or zinc. German silver isn't silver at all and contains copper, zinc, and nickel.
Hope this helps!
How many molecules are there in 10.5 grams of iron (111) sulfate trihydrate? With work shown
2. How does an atom become an Ion
Which two statements about composite materials is true?
A. They're made up of more than one substance
B. They have the same or similar properties as the materials used to make them
C. They're always made of metal
D. They're readily available in nature
help as fast as u can please
Which is correct order of the weather observed with each cloud type from 1 to 4?
A. Rain, thunderstorm, snow, fair
B. Light rain, fair, thunderstorm, fair
C. Light rain, thunderstorm, fair, fair
D. Hail, lightning, thunderstorm, fair
Answer:i thinks its A
Explanation:but who knows
_______________ is the interaction between organisms in an ecosystem.
Answer please I need help
Answer:
Explanation::::
The foam football Coach Johnson left in his chair will stay there until he
moves it to sit in the chair.
A. Newton’s first law
B. Newton’s second law
C. Newton’s third law
Answer:
B. Newton’s second law
Explanation:
correct me if im wrong
Answer:
Its c newton third law
Explanation:
His third law states that for every action (force) in nature there is an equal and opposite reaction. In other words, if object A exerts a force on object B, then object B also exerts an equal and opposite force on object A. Notice that the forces are exerted on different objects.
how much energy must be released by 50.0 g of steam to decrease its temperature from 125.0 degrees Celsius to 100.0 degrees Celsius ?
Answer:
5250 Joules
Explanation:
Mass = 50g
Initial Temperature = 125.0 degrees Celsius
Final Temperature = 100 degrees Celsius
Temperature change = Final - Initial = 100 - 125 = -25
Heat = ?
These quantities are related by the equation;
H = mCΔT
where c = specific hear capacity = 4.2 J/g°C
H = 50 * 4.2 * (-25)
H = -5250 J (The negative sign is because heat is being released)
Bond energies can be used to estimate the energy of a reaction. Why is this only an estimate?
A) It's difficult to measure such a smal amount of energy.
B) The bonds in all molecules are the same, but not all molecules have bonds that are easily measured.
C)The same bond in a different molecule has a different energy. For example, O-H in water versus ethanol has different energies.
D) It's difficult to isolate an individual bond.
Answer:
C)The same bond in a different molecule has a different energy. For example, O-H in water versus ethanol has different energies.
Explanation:
This is true going by the the statement about the bond energies and the bonding being different among the various elements. In the example given which is between ethanol and water, the bonds which exist among the elements is stronger in water than in ethanol. That is why, ethanol is easily combustible than water.
Answer:
The same bond in a different molecule has a different energy. For example, O-H in water versus ethanol has different energies.
Explanation:
Compare land cover and land use, explaining how they are related and describing one way that humans can affect that relationship.
Answer:
Land covers refer to all the manufactured structures and vegetation that covers the land it includes all vegetation including plants, shrubs, trees, and other man-made structures too.
On other hand, Land use is the term that explains the use of the land by the different human activities that are occurred on land that are directly related to the land.
Land cover influences land use by utilizing particular land such as parks, ponds, or other uses according to the land. and humans can cause changes in both when they urbanize the area or land.
SUMMARY: Write a 3-4 sentence summary about the Periodic Table.
Answer:
The periodic table, also known as the periodic table of elements, is a tabular display of the chemical elements, which are arranged by atomic number, electron setup, and repeating chemical properties. The structure of the table shows occasional (popular things/general ways things are going). The seven rows of the table, called periods, generally have metals on the left and nonmetals on the right. The columns, called groups, contain elements with almost the same chemical behaviours. Six groups have accepted names as well as assigned numbers: for example, group 17 elements are the halogens; and group 18 are the noble gases. Also displayed are four simple rectangular areas or blocks connected with the filling of different atomic orbitals.
Explanation:
i think that's what you're looking for...
Choose the more metallic element from each pair.
a . Sr or Sb,
b. As or Bi,
c. Cl or O,
d. S or As
Answer:
c
Explanation:
CI or O
Carla Vista Company has the following information available for September 2020.
Unit selling price of video game consoles $410
Unit variable costs $328
Total fixed costs $36,900
Units sold 600
Compute the unit contribution margin.
Unit contribution margin enter the unit contribution margin
Prepare a CVP income statement that shows both total and per unit amounts.
Compute Carla Vista’ break-even point in units.
Break-even point in units enter Break-even point in units units
Prepare a CVP income statement for the break-even point that shows both total and per unit amounts.
The more metallic element pair is Cl or O. Therefore, option C is correct.
What is metallic element ?Except for hydrogen, which is a nonmetal, the elements are arranged in a triangle with the metals to the left, the nonmetals to the right, and the metalloids to the immediate right of the triangle.
Metal atoms are bound together by metallic bonds to form solids known as metallic solids. Metal solids include things like copper, gold, and zinc, for instance. Since cesium is the last naturally occurring alkali metal, it has the most metallic characteristics.
The non-metal components, like as rock and rubbish, are subsequently removed from the ore during processing. The subsequent melting and combining of various metal components yields metal alloys. A solid metal alloy substance is produced when the freshly combined metal compound has cooled.
Thus, option C is correct.
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How many
neutrons would
be found in
carbon-15 if it
were to exist?
Show your work.
Answer:
8 neutrons
A is the number of neutrons plus protons in the nucleus. However, we already know that there are 7 protons. Therefore, there must be 8 neutrons in the nucleus to add up to 15. Table 3.
Element Symbol Number of Neutrons
carbon 146C 8
nitrogen 147N 7
157N 8
oxygen 168O 8
Explanation: