Br2 represents both an element and a molecule.
A molecule is defined as a group of atoms bonded together. An element is defined as a substance that cannot be chemically broken down further into simpler substances. Br2 is only bromine and it is two bromine atoms boned together to form a molecule.
Please help me the density of gasoline is 0.79 g/mL, what mass of gasoline, in kilograms, is in a full
25-gallon tank?
Answer: 74.54kg
Explanation:
Gasoline is 0.79 g/mL
1Kg/1000g x 0.79g/mL x 1000mL/1L x 1L/1.06 quarts x 4 quarts/1gallon x 25 gallons
1 x 0.79 x 1000 x 1 x 4 x 25 divided by 1000 x 1 x 1 x1.06 x 1 =74.54Kg
22. 2 ZnS (s) + 3 O2 (g) → 2 ZnO (s) + 2 SO2 (g)
a. If you have 467.2 g of ZnS, and excess O2, how many moles of SO2 can you form?
The moles of SO₂ formed if you have 467.2 g of ZnS and excess O₂ is 4.79 moles.
The balanced chemical reaction of the give equation is-
2 ZnS(s) + 3 O₂(g) → 2 ZnO(s) + 2 SO₂(g)
What is mole?
Mole is defined as fundamental measurement unit which is used to measure the amount of substance.
Number of moles of ZnS = Given mass
Molar mass
Moles of ZnS = 467.2 g
97.47 g/mol
Moles of ZnS = 4.79 moles
From the reaction, we know that
2 moles of ZnS forms 2 moles of SO₂
4.79 moles of ZnS forms 2 x 4.7 moles of SO₂
2
Moles of SO₂ = 4.79 mol
Hence, the moles of SO₂ can be formed is 4.79 moles.
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What is the equation for the base dissociation constant, Kb, of NH3?
NH,(aq)+H,O(l)
The formula for the base dissociation constant (Kb) is Kb = [NH4+][OH-]/[NH3].
Briefing :Kb is a temperature-dependent constant that is typically calculated at 25 degrees Celsius. Ammonia has a Kb value of 1.8E-5 (the notation "E-5" stands for "ten in power -5").
What causes NH3 to dissociate?A basic solution is created when ammonia and water are combined. Ammonium hydroxide is created when a little amount of dissolved ammonia combines with water. This compound then breaks down into ammonium and hydroxide ions.
What is the base dissociation constant?A material that absorbs hydrogen ions or protons in solution is referred to as a base. The base dissociation constant is the equilibrium constant for the equilibrium created when a weak base interacts with water.
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I'm stuck and in need of help.
Assuming the compound is dissolved in water, what is the formula for phosphorous acid?
Symbol
Name
phosphate
PO
phosphite
phosphorus
0 H3P
0 H3PO4
O HP
0 Hзроз
PO3
P
H3PO3 - is the formula for phosphorous acid
What is Phosphoric acid?Phosphoric acid is a colourless, odourless, solid, inorganic compound containing phosphorus with the chemical formula H3PO. It is usually found as an 85% aqueous solution, which is a colourless, odourless, non-volatile syrupy liquid. Phosphoric acid is part of fertilizers (80% of total use), detergents and many household cleaning products. Diluted solutions have unpleasantly sour taste; As a result, it is also used as an additive to soft drinks and other ready-to-eat foods, imparting acidic properties, and in water purification products.To learn more about Phosphoric acid, visit;
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Answer: the answer is D
Explanation: hope this helps just did it
How do the particles within a liquid move?o
Answer:
In liquids, particles are quite close together and move with random motion throughout the container. Particles move rapidly in all directions but collide with each other more frequently than in gases due to shorter distances between particles.
What is chemistry in science
Answer:
What does chemistry mean in science?
Chemistry is a branch of natural science that deals principally with the properties of substances, the changes they undergo, and the natural laws that describe these changes.
Explanation:
QUICK!
An engineer is determining the effectiveness of a new machine that produces
ammonia from hydrogen and nitrogen. This is an example of which step in
the engineering process?
O A. Manufacture and test a prototype.
O B. Identify solutions to the problem.
O C. Research the problem.
O D. Plan a detailed design.
The engineer determining the effectiveness of a new machine that produces ammonia from hydrogen and nitrogen is an example of a) Manufacturing and testing a prototype.
Ammonia can be obtained using the process called Haber's process. In designing a machine for manufacturing ammonia, a series of steps are to be taken. The first step is to identify the problem and the second is to find solutions to the problem.
To make the solutions obtained to be in practice, the third step includes drafting a strategic plan and design. After obtaining the design the last step is to test the design for its efficiency.
In the case of the machine designed for manufacturing Ammonia, determining the effectiveness of the machine could be tested by manufacturing and testing a sample.
Hence, the correct option is a).
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The combustion of propane may be described by the chemical equation
C₂Hg (g) + 5O₂(g) → 3 CO₂(g) + 4H₂O(g)
-
How many grams of O₂(g) are needed to completely burn 27.6 g C3H₂(g)?
According to the given statement 4.64 grams of O₂(g) are needed to completely burn 27.6 g C₃H₂(g).
What is called chemical equation?Chemical equations are symbolic depictions of chemical reactions where the reactants and products are stated in terms of their respective chemical formulae.
Briefing:Mass of C₃H₂ = 27.6 g
Molar mass of C₃H₂ = 38.05 g/mol
Molar mass of O₂= 32 g/mol
We have to calculate the moles of C₃H₂
moles of C₃H₂ = given mass C₃H₂/molar mass C₃H₂
moles of C₃H₂ = 27.6/38.05 = 0.725 mol
We have to calculate the moles of C₃H₂
The balanced chemical equation is:
C₂Hg (g) + 5O₂(g) → 3 CO₂(g) + 4H₂O(g)
From the reaction, we conclude that
As, 1 mole of C₂Hg react with 5 mole of O₂
So, 0.725 mole C₃H₂ of react with 0.725/5 = 0.145 mole of O₂
We have to calculate the mass of O₂
Mass of O₂ = Moles of O₂ * Molar mass of O₂
Mass of O₂ = (0.145moles) * (32g/mol) = 4.64g
The mass of O₂ needed is, 4.64 grams.
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Electronic Configuration of the
first 50 elements
Answer:
that is some above
Explanation:
because of the chemical reaction
In an aqueous solution of ethanol, C₂H₅OH, what ions or molecule/s would be present in solution?
In an aqueous solution of ethanol, C₂H₅OH, the molecules that would be present in the solution are ethanol molecules and water molecules.
What are aqueous solutions?Aqueous solutions are solutions containing water as the solvent of the solution.
An aqueous solution simply means dissolved in water.
When dissolved in water, ionic compounds dissociate to form ions in aqueous solutions.
Other polar solutes which are non-ionic will simply dissolve in water as a result of the interaction of the polar ends of the molecules. However, no ions will be formed by these polar non-ionic solutes.
For example, a solution of ethanol in water is a non-ionic aqueous solution.
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POST-LAB QUESTIONS.
Write and balance the following chemical equations:
a) Al (s) + HCl (aq) → AlCl3 (aq) + H₂ (g)
b) C10H8 (s) + O2 (g) → H₂0 (1) + CO2 (g)
c) Sodium sulfate + barium nitrate → barium sulfate + sodium nitrate
d) Calcium carbonate + heat → calcium oxide + carbon dioxide
a) 2Al (s) + 6HCl (aq) → 2AlCl3 (aq) + 3H₂ (g)
b) 2C10H8 (s) + O2 (g) → H₂0 (1) + CO2 (g)
c) 2 Na2SO4 + 2 BA(NO3)2 → 2 BA(SO4) + 2NANO3
d) CaCO3 + heat → CaO + CO2
This are the Balanced Chemical equations.
Balanced chemical equationThe chemical equation can be said to as a balanced one if there are no inequalities. Every element in this illustration of a balanced equation has the same number of atoms on the reactant and product sides.
Chemical equation that is balanced is described as one in which the number of atoms of various elements on the reactants side (left side) and that on the product side (right side) are equal.
How should a balanced chemical equation be written?The reactants and products are now placed on the left and right sides of the arrow, respectively so that they create a balanced equation. Coefficients, that appear as a number before any kind of chemical formula, represent moles of a compound.
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1.000 x 10 3 ml of a solution of H2SO4 made by adding 571.6 g of sulfuric acid to water has a density of 1.3294 g/ml. (molar mass of sulfuric acid is 98.08 g/mol)
What is the molar concentration?
From the calculation, we now obtain the molarity of the sulfuric acid to be 5.8 Mol/L
What is molar concentration?The term concentration is defined as the ratio of the number of moles to the volume of the solution. We know that unit of the molarity of the solution is the moles per liters.
We know the following;
Mass of the acid = 571.6 g
Volume of the acid = 1.000 x 10^3 ml or 1 L
Molar mass of the acid = 98.08 g/mol
Hence;
Number of moles of the acid = 571.6 g/98.08 g/mol = 5.8 moles
Molar concentration of acid = 5.8 moles/ 1 L
= 5.8 Mol/L
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A student is doing an investigation with solids, liquids, and gases. They put each substance into a large syringe and press down. The
student is not able to compress the solid or the liquid into a smaller volume. When they get to the gas, they notice that it will compress
into a smaller volume. Why are gases more compressible than liquids and solids? 100 points
The term route of entry on an SDS refers to the way a _____ enters the body.
The term route of entry on an SDS refers to the way a chemicals enters the body
The Safety data sheet (SDS) means which refer to the very complete documents about the chemicals the written or printed material concerning a hazardous chemical that is prepared in accordance with the HCS and the means by which a material may gain access to the body and example is inhalation, ingestion, and skin contact and and routes on an SDS refers to the way enters the chemicals in the body
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What is the molar mass of an element that has a mass of 10.4 grams and contains 0.129 moles?
The term mole concept is used here to determine the molar mass of an element. The molar mass of the element is 80.62 g/ mol.
What is a mole?One mole of a substance is that quantity of it which contains as many particles or entities as there are atoms in exactly 12 g of carbon -12. The equation which is used to calculate the number of moles is:
The mass of one mole of molecules of a substance is defined as the molar mass. It is generally expressed in g mol⁻¹
Number of moles = Given mass / Molar mass
Here the given mass of the element is 10.4 g. The number of moles of the element is 0.129 mole. Then the molar mass is:
Molar mass = Given mass / Number of moles
= 10.4 g / 0.129 mol
= 80.62 g/ mol
Thus the molar mass of element is 80.62 g/ mol.
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Which statement represents climate ?
According to the given statement Summer are usually hot and dry represent climate.
How would you define climate?Climate is the usual weather observed over a longer period of time in a certain location. A description of a climate includes specifics like the average temperature in each season, how much rain falls, and how much sun there is. Additionally, descriptions of the extreme are common.
Why is the climate important?Nearly every area of our life is impacted by the climate, including our food supplies, transport networks, clothing choices, and vacation destinations. It significantly affects our future, our wellbeing, and our means of subsistence. The long-term pattern of the climate in any given location is called the climate.
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What is the density (in grams/mL) of a solution with
a mass of 5,780.1 ng and a volume of 995 gallons?
(3.7851-1gal, Kilo = 10³)
The density of a solution with a mass of 5,780.1 ng and a volume of 995 gallons is calculated as 5.736. Grams per cubic centimeter can be stated as SI unit of measurement for density.
What are the methods for determining density?Either you have to measure the solid's dimensions or measure the liquid's volume using a measuring jug. To get a number in meters cubed, convert any necessary units.
Further in order to determine the mass of the object or material, place it on a scale.
Explain what density is.Density is the mass of a material or substance that is calculated per unit volume. d = M/V, where d can be stated as density, M as mass, and V as volume, that is the formula for density.
Describe density using an example.The amount of "stuff" is contained in a specific quantity of space is determined by its density. For instance, a block of the harder, lighter element gold (Au) will be denser than a block of the heavier element lead (Pb) (Au).
Styrofoam blocks are less dense than bricks. Mass per unit volume is how it is defined.
Which density types are there?Typically, there are two forms of density: absolute density and relative density. Relative
Density = m/v
= 5780.1/995
= 5.736
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What is the molarity of a CaCl2 solution that is prepared by dissolving 27.1 g of CaCl2 in sufficient water to give 779 mL of solution?
The molarity of a CaCl₂ solution that is prepared by dissolving 27.1 g of CaCl₂ in sufficient water to give 779 mL of solution is 0.31M.
How to calculate molarity?Molarity is the concentration of a substance in solution, expressed as the number moles of solute per litre of solution.
The molarity of a substance can be calculated by dividing the number of moles of the substance by the volume.
According to this question, 27.1 g of CaCl₂ is dissolved in sufficient water. The number of moles can be calculated as follows:
moles = 27.1g ÷ 110.98 g/mol
moles = 0.24mol
Molarity of CaCl₂ = 0.24mol ÷ 0.779L
Molarity of CaCl₂ = 0.31M
Therefore, 0.31M is the concentration required to prepare by dissolving 27.1 g of CaCl₂ in sufficient water.
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please help me set up the conversion factors + the set up. thank you
Answer:
Guys’ search it up on math thank me later
Explanation:
dhsjdjsusysgtjghtd fjfhfhcchdh
A sample of cigarette smoke contains 2.40% carbon monoxide. The U.S. national ambient air quality standard for CO in a 1-hr period is 35.0 ppm.
How many times greater than this standard is the CO concentration in cigarette smoke?
The cigarette smoke as it were is 686 times greater than the standard.
What is concentration?The term concertation is used to describe the amount of substance that is contained in a sample. There are several units that could be used in the measurement of concentration such as;
NormalityParts per million Parts per billionMolarityMolalityIn this case, the designation 35.0 ppm means 35 units of carbon monoxide in 1,000,000 units, this is the same as saying 3.5 x 10^-5.
Again we have the percent concentration of the sample as 2.40% or 0.024. Hence we would get the number of times greater than this standard is the CO concentration in cigarette smoke is by;
0.024/ 3.5 x 10^-5
= 686
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At 30°F and atmospheric pressure, water?
A. sublimes. B. melts. C. freezes. D. deposits. E. boils.
The correct answer is to freeze. Option C.
This diffusion effect of water molecules during freezing means that applying pressure to water also lowers its freezing point. With enough pressure which makes it difficult for water molecules to spread out into the solid structure, liquid water is a few degrees below zero degrees Celsius.
When water is placed in a vacuum it freezes slower or faster than water placed in a container or freezer at normal atmospheric pressure. Atmospheric pressure does affect the freezing temperature. The higher the pressure the lower the freezing temperature. For water stored in a tank, its bottom pressure is the weight acting on a unit area of the surface on which the tank is stored.
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if you start the reaction with 10 g of plantinum, 180 mL of 5 M HCL, and 223 mL of 6.55 M HNO3, how much H2PtCl6 would be formed
A reaction that starts with 10 g platinum, 180 mL 5 M HCl, and 223 mL 6.55 m [tex]HNO_3[/tex] will produce 20.9 grams of [tex]H_2PtCl_6[/tex].
Stoichiometric problemFirst, let's look at the equation of the reaction:
[tex]3 Pt + 4 HNO_3 + 18 HCl -- > 3 H_2[PtCl_6] + 4 NO + 8 H_2O[/tex]
The mole ratio of Pt, [tex]HNO_3[/tex], and HCl from the balanced equation of the reaction is 3:4:18.
Mole of 10 g platinum = 10/195
= 0.051
Mole of 180 mL, 5 M HCl = 180/1000 x 5
= 0.9 moles
Mole of 223 mL, 6.55 M [tex]HNO_3[/tex] = 223/1000 x 6.55
= 1.46 moles
Considering the mole ratio, HCl seems to be in excess while both platinum and [tex]HNO_3[/tex] are limiting.
Mole ratio of platinum and [tex]H_2PtCl_6[/tex] = 1:1
Equivalent mole of [tex]H_2PtCl_6[/tex] that is produced = 0.051 moles.
Mass of 0.051 mole platinum = 0.051 x 409.81
= 20.9 grams
Thus, the amount of [tex]H_2PtCl_6[/tex] that would be formed is 20.9 grams.
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If the theoretical yield of a reaction is 332.5 g and the percent yield for the reaction is 38 percent, what's the actual yield of product in grams?
A)
126.4 g
B)
8.74 g
C)
116.3 g
D)
12616 g
Calculate the pH for each case in the titration of 50.0 mL of 0.190 M HClO(aq) with 0.190 M KOH(aq). Use the ionization constant for HClO.
What is the pH before addition of any KOH?
pH=
What is the pH after addition of 25.0 mL KOH?
pH=
What is the pH after addition of 40.0 mL KOH?
pH=
What is the pH after addition of 50.0 mL KOH?
pH=
What is the pH after addition of 60.0 mL KOH?
pH=
Answer:
6.13, 7.53, 8.13, 10.25, 12.24
Explanation:
Without any KOH, the pH can be calculated using an ICE table (initial, change, equilibrium). I will assume that the pka is 7.53 since that's the value that wikipedia gives
after setting up the table the equation left should be:
[tex]\frac{x^2}{0.19-x} = 2.95*10^{-8}[/tex] - original equation
the equation can be simplified to [tex]\frac{x^2}{0.19} = 2.95*10^{-8}[/tex] since if x is really small, (0.19-x) will be pretty much equal to 0.19
solve to get x = 7.49*10^-7, and since [tex]\frac{7.49*10^{-7}}{0.19}[/tex] is very small, we don't have to calculate x with the original equation instead of approximating it with the simplified equation
since x = [H3O+], -log(x) would give us the ph, so the pH would be
-log(7.49*10^-7) = pH = 6.13
For the other problems, calculate the number of moles of each of the components
in total, we have 0.05*0.19 moles of HClO, which is 0.0095 moles.
after adding 0.025*0.19 moles of KOH (0.00475 moles), there would be 0.0095-0.00475 moles of HClO left, and 0.00475 moles of ClO- would be generated. The concentrations of both ClO- and HClO are both about equal to 0.00475/0.075 (0.075 is the total amount of liquid after adding 25 ml of KOH). The fraction simplified to 0.0633
Using the equation
pH = pKa + log([A-]/[HA]), we would get pH = 7.53 + log(0.0633/0.0633)
so pH = 7.53 after 25 mls of KOH has been added
Do a similar thing for 40 mls of KOH being added.
pH = 7.53 + log(0.0844/0.0211) = pH = 8.13
For 50 mls, an ICE table needs to be used again since the moles of base and acid are roughly equal.
The resulting solution should be equal to adding
0.05*0.19 moles of KClO to water, which would be a 0.05*0.19/0.1 molar concentration, or 0.095M
Set up an equation and use ICE:
[tex]ClO^-+H2O = > HClO + OH^-[/tex]
the Kf of this equation can be calculated by rearranging this reaction and utilizing the equation for the auto-ionization of water
[tex]HClO + H2O = > H3O^+ + ClO^-[/tex] with a Ka of 2.95*10^-8
flip the reaction to get:
[tex]H3O^+ + ClO^- = > HClO + H2O[/tex] and the Ka is 1/(2.95*10^-8) , or 33898305.1
Use the equation:
[tex]2H_2O = > H_3O^+ + OH^- , \ \ \ \ K_w = 10^{-14}[/tex]
and add the equations
[tex]2H2O + H3O^+ + ClO^- = > HClO + H2O + H3O^+ + OH^-[/tex]
the K for this equation is just 33898305.1 times 10^-14
which is 3.39*10^-7
the equation can have terms present on both sides of the equation canceled out to get
[tex]ClO^-+H2O = > HClO + OH^-[/tex] with a K of 3.39*10^-7
Set up the ICE table once more, note that the ClO- concentration is 0.095
x^2/(0.095-x) = 3.39*10^-7
approximate the equation to be:
x^2/(0.095) = 3.39*10^-7
solve for x = 0.00017945 = [OH-]
the pOH would be 3.746, and since 14 = pH+pOH,
14 = pH + 3.746
pH = 10.25
For the final equation it is much simpler. Since the moles of strong base is more than the moles of acid, the pOH can be calculated by just taking the -log of the excess base, which is 0.01*0.19 moles, or 0.01*0.19/(0.11) molar solution
The concentration of OH is 0.01*0.19/(0.11), which is 0.0173.
-log(0.0173) = pOH
pOH = 1.76
pH = 1.76 = pH = 12.24
Which of the following has highest boiling points propanol or hexanone?
The compound with the highest boiling point is hexanone. Hexanone has the highest boiling point among the following substances at degree Celsius, and its structure is much more compact than that of the other substances.
Where does a boiling point occur?The temperature at which a liquid's vapor pressure matches that of the surrounding environment's liquid is known as the boiling point. As gas forms below the surface and escapes upwards at this temperature, the liquid starts to bubble.
What makes boiling point important?Important information about an organic compound's structural make-up and physical characteristics can be learned from its boiling point. The boiling point of a chemical can be used to identify and describe the substance. At higher atmospheric pressures, water boils more quickly than it does at lower atmospheric pressures.
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convert from grams to moles for 22gH2O
Answer
Moles = 1.22 moles
Explanation
Given
Mass of water = 22 g
We know the molar mass of water = 18,01528 g/mol
Required: Moles of H2O
Solution
To calculate the number of moles, use
n = m/M where n is the moles, m is the mass and M is the molar mass
n = 22g/18,01528 g/mol
n = 1.22 mol
Answer:mole =22gm/ 18gm = 1.22moles
Explanation:A mole is calculated by dividing the given weight from molecular weight of the compound. In this case Molecular weight of H2O = 18 grams. So answer is 22/18= 1.22
Which of these are chemical compounds?
02
CO 2
H ₂0
N 2
CO 2
H ₂0
what are chemical compounds?a material created by chemically combining two or more components in a certain ratio.any substance made up of similar molecules with atoms from two or more chemical elements is a chemical compound.To learn more about : chemical compounds
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Why are cats better than dogs?
Answer:
Cats are eazy to take care for and relatively affordable
Answer:
cats r better cuz there cats ovi
Explanation:
there small, easy to take care of, and the are good with kids depending on the breed.
The following graph shows water solubility of some salts versus temperature
(In g of salt/ 100 g water)
Which curve of curves on the chart shows the melt that has the largest solution temperature (with a positive sign) and why?
The following graph shows water solubility of some salts versus temperature curves on the chart shows the melt that has the largest solution temperature is the curve b
Water solubility is the because of its polarity and ability to form hydrogen bonds and also water makes an excellent solvent means it can dissolve so many kind of molecules
Here given graph shows water solubility of some salts versus temperature and in that curve a, c and d show the low temperature but b curve show almost high temperature and that's why the melt that has the largest solution temperature and also has a positive sign and curve c and d are show constant water solubility and curve b shoe first high then low and then more high that's why the curve b has the largest temperature
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