What is the number of electrons in an atom of 23v that have an quantum number of 2?
A solution is prepared by dissolving 27.7 g of cacl2 in 375 g of water. the density of the resulting solution is 1.05 g/ml. the concentration of cacl2 is __________% by mass.
The concentration of [tex]{\text{CaC}}{{\text{l}}_{\text{2}}}[/tex] is [tex]\boxed{6.88\;\%}[/tex] by mass.
Further Explanation:
The proportion of substance in the mixture is called concentration. The most commonly used concentration terms are as follows:
1. Molarity (M)
2. Molality (m)
3. Mole fraction (X)
4. Parts per million (ppm)
5. Mass percent ((w/w) %)
6. Volume percent ((v/v) %)
Mass percent:
It is the ratio of the mass of a component divided by the total mass of the solution, multiplied by 100.
The formula to calculate the mass percent of [tex]{\text{CaC}}{{\text{l}}_2}[/tex] is as follows:
[tex]{\text{Mass}}\;{\text{percent of CaC}}{{\text{l}}_2} = \left( {\frac{{{\text{Mass of CaC}}{{\text{l}}_{\text{2}}}}}{{{\text{Mass of CaC}}{{\text{l}}_2}\;{\text{solution}}}}} \right)\left( {100} \right)[/tex] …… (1)
The formula to calculate the mass of [tex]{\text{CaC}}{{\text{l}}_2}[/tex] solution is as follows:
[tex]{\text{Mass of CaC}}{{\text{l}}_{\text{2}}}{\text{ solution}} = {\text{Mass of CaC}}{{\text{l}}_{\text{2}}} + {\text{Mass of water}}[/tex] …… (2)
The mass of [tex]{\text{CaC}}{{\text{l}}_2}[/tex] is 27.7 g.
The mass of water is 375 g.
Substitute these values in equation (2).
[tex]\begin{aligned}{\text{Mass of CaC}}{{\text{l}}_{\text{2}}}{\text{ solution}}&=27.7{\text{ g}}+{\text{375 g}}\\&={\text{402}}{\text{.7 g}}\\\end{aligned}[/tex]
The mass of [tex]{\text{CaC}}{{\text{l}}_2}[/tex] is 27.7 g.
The mass of [tex]{\text{CaC}}{{\text{l}}_2}[/tex]solution is 402.7 g.
Substitute these values in equation (1).
[tex]\begin{aligned}{\text{Mass}}\;{\text{percent of CaC}}{{\text{l}}_2}&=\left( {\frac{{{\text{27}}{\text{.7 g}}}}{{{\text{402}}{\text{.7 g}}}}} \right)\left( {100} \right)\\&=6.8785\;\%\\&\approx 6.8{\text{8 \% }}\\\end{aligend}[/tex]
Therefore the mass percent of [tex]{\mathbf{CaC}}{{\mathbf{l}}_{\mathbf{2}}}[/tex] is 6.88 %.
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Answer details:
Grade: Senior School
Subject: Chemistry
Chapter: Concentration terms
Keywords: mass percent, 6.88 %, mass of CaCl2, mass of water, mass of CaCl2, concentration, CaCl2, 27.7 g, 375 g, 402.7 g.
Final answer:
The concentration of CaCl2 in the solution is approximately 6.88% by mass.
Explanation:
The concentration of a solution is usually expressed as a percent by mass. In order to calculate this, we need to determine the mass of the solute (CaCl2) and the mass of the solution (cacl2 + water).
Given that 27.7g of CaCl2 is dissolved in 375g of water, the total mass of the solution would be 27.7g + 375g = 402.7g.
The concentration of CaCl2 is then calculated by dividing the mass of CaCl2 by the mass of the solution and multiplying by 100%: (27.7g / 402.7g) x 100% ≈ 6.88%.
What bonds are broken during the combustion of methane (CH4) to form water and carbon dioxide?
C–H bonds in methane and O–O bonds in oxygen
C–O bonds in carbon dioxide and O–O bonds in oxygen
C–H bonds in methane and H–O bonds in water
H–O bonds in water and C–O bonds in carbon dioxide
Answer:
The correct answer is: C–H bonds in methane and O–O bonds in oxygen.
Explanation:
During the combustion of methane, methane react with oxygen molecule to give carbon dioxide and water molecule.
[tex]2CH_4+3O_2\rightarrow 2CO_2+2H_2O[/tex]
During the course of reaction :
Bond between C-H atom in methane will be broken down Bond between O-O bond will be broken down.During course of formation of products:
Bonds between oxygen and carbon atom will formed Bonds between oxygen ah hydrogen at will be formed.What happens in an acid-base reaction according to the arrthenius defintion?
Final answer:
The Arrhenius definition of acid-base reactions states that an acid is a substance that dissociates in water to produce H+ ions, while a base is a substance that dissociates in water to produce OH- ions. Acid-base reactions involve the transfer of a proton from the acid to the base, resulting in the formation of water and a salt.
Explanation:
The Arrhenius definition of acid-base reactions states that an acid is a substance that dissociates in water to produce H+ ions, while a base is a substance that dissociates in water to produce OH- ions.
According to Arrhenius, an acid-base reaction involves the reaction of a proton (H+) from the acid with a hydroxide ion (OH-) from the base, resulting in the formation of water.
For example, in the reaction between hydrochloric acid (HCl) and sodium hydroxide (NaOH), HCl donates a proton (H+) to NaOH, which accepts the proton, forming water (H2O) and sodium chloride (NaCl) as a salt.
Check all correct statements concerning pentyne.
contains 3 carbons
contains 5 carbons
contains 7 carbons
has only single bonds
has a double bond
has a triple bond
is an alkyne
is an alkene
is an alkane
Which statement is not true of alkenes?
They are unsaturated.
They are reactive.
They have double bonds.
They are more stable than alkanes.
Butene would have 4 carbon atoms and a ______ bond.
Single
Triple
Double
Which type of reaction to alkenes generally undergo?
Substitution
Displacement
Redox
Addition
If the carbon atom of hydrocarbon is bonded to less than 4 other atoms, the hydrocarbon is considered _______.
aromatic
diluted
saturated
unsaturated
Which of the following apply to unsaturated hydrocarbons? Select all that apply.
They do not have isomers.
They are more stable than saturated hydrocarbons.
They will react readily with other elements and compounds.
They have double and triple bonds.
They only have single bonds.
A straight chain hydrocarbon with the formula C5H10:
has a triple C-C bond
has a double C-C bond
is essentially inert
is unstable and extremely reactive
What is the general formula for alkenes?
CnH2n+2
CnH2n
CnH2n+1
CH2n+2
Choose the statements about benzene that are correct.
all benzene hydrocarbons are CnHn+2
All C-C bonds share 2 pairs of electrons.
Three C-C bonds share 2 pairs of electrons.
All of the C-C bonds are actually identical.
The structure of the molecule is closed like a ring structure.
The last one is attached as a pic.
Explanation:
1) Pentyne is an unsaturated hydrocarbon with formula [tex]C_5H_8[/tex]. It is an alkyne molecule with single triple bond present in it.
Correct statements are:
Contains 5 carbonsHas a triple bond Is an alkyne2) Alkenes are unsaturated hydrocarbons with double bonds.
They are unsaturated.They are reactive. They have double bonds.3) Butene is an unsaturated hydrocarbon with 4 carbon atoms and double bonds.
4)Alkene undergo addition reaction easily.
5)If the carbon atom of hydrocarbon is bonded to less than 4 other atoms, the hydrocarbon is considered unsaturated.
6)The correct statements are:
They have double and triple bonds. They will react readily with other elements and compounds.7)The general formula of :
Alkane = [tex]C_nH_{2n+2}[/tex]
Alkene = [tex]C_nH_{2n}[/tex]
Alkyne = [tex]C_nH_{2n-2}[/tex]
The [tex]C_5H_{10}[/tex] is an alkene with double C-C bond.
8) The general formula of alkene is given by: [tex]C_nH_{2n}[/tex]
9) Benzene is an aromatic cyclic compound with six membered carbon ring with alternative double bonds. Due to conjugation of double bond all the C-C bonds are identical.
All C-C bonds share 2 pairs of electrons.All of the C-C bonds are actually identical.The structure of the molecule is closed like a ring structure.How many grams of sodium chloride are required to prepare 500.0 ml of a 0.100 m solution?
a.1.46 g strike reset
b.2.93 g strike reset
c.29.3 g strike reset
d.58.5 g strike reset?
In order to prepare 500.0 mL of a 0.100 M NaCl solution, 2.93 g of sodium chloride are required (Option b).
What is molarity?Molarity is the number of moles of solute per liters of solution.
We have 500.0 mL of a 0.100 M NaCl solution. First, we will calculate the moles of solute using the definition of molarity.
M = moles solute / liters solution
moles solute = M × liters solution
moles solute = 0.100 mol/L × 0.5000 L = 0.0500 mol
Next, we will convert 0.0500 moles of NaCl to grams using its molar mass.
0.0500 mol × 58.5 g/mol = 2.93 g
In order to prepare 500.0 mL of a 0.100 M NaCl solution, 2.93 g of sodium chloride are required (Option b).
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A chemical reaction that absorbs heat from the surroundings is said to be ________ and has a ________ δh at constant pressure.
An endothermic process is a chemical reaction or physical change that absorbs heat, with a positive change in enthalpy. An example is the reaction in a cold pack, where heat is absorbed, resulting in a sensation of cold. In contrast, an exothermic process releases heat, such as the combustion reaction in a Bunsen burner.
Explanation:An endothermic process is a chemical reaction or physical change that absorbs heat from the surroundings. It is represented by a positive change in enthalpy, which is the sum of a system's internal energy and the mathematical product of its pressure and volume.
An example of an endothermic process is the reaction that occurs in a cold pack used to treat muscle strains. When the substances in the cold pack are brought together, heat is absorbed, resulting in a sensation of cold.
In contrast, an exothermic process releases heat. An example of an exothermic process is the combustion reaction that occurs when using a Bunsen burner. The heat given off during this reaction is equal to the enthalpy change of the methane combustion reaction.
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What mass of h2o is formed when h2 reacts with 384 grams of o2?
Describe what a polar covalent bond is and name a common compound that has a polar covalent bond holding it together
How many moles of water h2o are present in 75.0 g h2o?
A student conducted an experiment and was interested in the mass of the product of the chemical reaction. some results are shown above. what is the mass of the nacl?
How does the total volume of gas particles compare to the volume of the space between gas particles?
sphingomyelin contains a fatty acid linked by an ________ bond and phosphocholine linked via the c-3 hydroxyl group of sphingosine.
Which is true about the numerical value of the gibbs free-energy change for a spontaneous reaction?
Answer:
It is negative
Explanation:
Which general formula can be used to identify carbohydrates?
Explanation:
Carbohydrates are the organic compounds that contain a carbon, hydrogen and oxygen atoms which are chemically combined together.
Their general formula is [tex](CH_{2}O)_{x}[/tex] where x is any integer.
For example, lactose has chemical formula [tex]C_{12}H_{22}O_{11}[/tex] and it is a carbohydrate.
A carbohydrate can be monosaccharide, disaccharide, oligosaccharide or polysaccharide.
How much 0.85 M HCl solution can be made by diluting 250 mL of 10 M HCl?
Answer is: 2940 mL of the HCL solution.
c₁(HCl) = 10.0 M.
V₂(AgNO₃) = ?.
c₂(AgNO₃) = 0.85 M.
V₁(AgNO₃) = 250 mL ÷ 1000 mL/L = 0.25 L.
c₁ - original concentration of the solution, before it
gets diluted.
c₂ - final concentration of the solution, after dilution.
V₁ - volume to be diluted.
V₂ - final volume after dilution.
c₁ · V₁ = c₂ · V₂.
V₂(HCl) = c₁ · V₁ ÷ c₂.
V₂(HCl) = 10 M · 0.25 L ÷ 0.85 M.
V₂(HCl) = 2.94 L · 1000 mL = 2940 mL.
if 1.20 moles of copper react with mercuric nitrate how many moles of mercury form
To determine the number of moles of mercury formed when 1.20 moles of copper react with mercuric nitrate, you need to examine the balanced chemical equation. For every 2 moles of copper that react, 2 moles of mercury are formed. Therefore, if you have 1.20 moles of copper, you will also have 1.20 moles of mercury formed.
Explanation:In order to determine the number of moles of mercury formed when 1.20 moles of copper react with mercuric nitrate, you need to examine the balanced chemical equation for the reaction. The balanced equation is:
2Cu + Hg(NO3)2 → 2Hg + 2Cu(NO3)2
From this equation, you can see that for every 2 moles of copper (Cu) that react, 2 moles of mercury (Hg) are formed. Therefore, if you have 1.20 moles of copper, you will also have 1.20 moles of mercury formed in the reaction.
Given the balanced equation for the reaction of copper with mercuric nitrate, 1.20 moles of copper will produce 1.20 moles of mercury.
Given the reaction between copper and mercuric nitrate, we can use stoichiometry to determine the moles of mercury produced. The balanced chemical equation for this type of reaction is:
Cu + Hg(NO₃)₂ → Cu(NO₃)₂ + Hg
From this equation, we see that 1 mole of copper (Cu) reacts with 1 mole of mercuric nitrate (Hg(NO₃)₂) to produce 1 mole of mercury (Hg).
Since we have 1.20 moles of copper reacting, we can directly infer that:
1.20 moles of Cu → 1.20 moles of Hg
Identify the balanced chemical reaction: Cu + Hg(NO₃)₂ → Cu(NO₃)₂ + HgDetermine the mole ratio between copper and mercury from the balanced equation (1:1).Using this ratio, 1.20 moles of copper will produce 1.20 moles of mercury.A gas occupies a volume at 34.2 mL at a temperature of 15.0 C and a pressure of 800.0 torr. What will be the volume of this gas at STP?
How many moles of naf must be dissolved in 1.00 liter of a saturated solution of pbf2 at 25°c to reduce the [pb2+] to 1.0 × 10–6 m? the ksp for pbf2 at 25 °c is 4.0 × 10–8?
To reduce the [Pb2+] to 1.0 × 10⁻⁶ M in a 1.00 liter solution of saturated PbF2, 26.45 grams of NaF should be added, as the Ksp for PbF2 is 4.0 × 10⁻⁸ at 25°C.
Explanation:To determine how many moles of NaF must be added to a 1.00 liter solution of saturated PbF2 to reduce the [Pb2+] concentration to 1.0 × 10−6 M, we need to consider the Ksp of PbF2 and the common ion effect. The Ksp expression for PbF2 is Ksp = [Pb2+][F−]2, and the Ksp value given is 4.0 × 10−8 at 25°C. As we add NaF, which is a source of fluoride ions, F−, this will affect the equilibrium according to Le Chatelier's principle.
Since NaF fully dissociates in solution, each mole of NaF will provide one mole of F−. Our target is to maintain the [Pb2+] at 1.0 × 10−6 M while knowing the Ksp. From this, we can derive that:
[F−] = √(Ksp / [Pb2+]) = √(4.0 × 10⁻⁸ / 1.0 × 10⁻⁶ M) = √(4.0 × 10⁻² M) = 6.3 × 10⁻¹ M
Since the concentration of F− should be approximately 0.63 M to maintain the [Pb2+] at the desired level, and we want to achieve this in a 1-liter solution, we need to dissolve 0.63 moles of NaF:
0.63 moles × 41.99 g/mol = 26.45 grams of NaF.
This is the mass of NaF that should be dissolved to achieve the desired [Pb2+] in the solution.
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Elements of group 4a do not commonly form ions. generally form negative ions. do not combine with other elements. generally form positive ions.
Final answer:
Elements of Group 4A typically do not form ions readily, but when they do, they generally form positive ions or cations with a +4 charge.
Explanation:
Group 4A elements, also known as the carbon group, typically do not form ions easily. This is because the elements in this group generally have a balance between the energy required to lose or gain electrons, making the formation of ions less favorable. When these elements do form ions, they generally form positive ions or cations. Looking at the periodic table, main-group elements to the left tend to form cations with a positive charge equal to the group number. Conversely, elements to the right, particularly nonmetals, often form anions with a negative charge corresponding to the number of groups they are left of the noble gases. Group 4A elements would thus be expected to form 4+ cations if they were to form ions, which is a high charge and not commonly observed due to the energy involved in removing four electrons.
What is the total number of atoms contained in 2.00 moles of nickel?
The total number of atoms contained in 2.00 moles of nickel is 1.204 × 10²⁴ atoms
HOW TO CALCULATE NUMBER OF ATOMS:
The number of atoms in an element can be calculated by multiplying the number of moles by Avogadro's number. That is;no. of atoms = no. of moles × 6.02 × 10²³According to this question, there are 2 moles of nickel (Ni). The number of atoms can be calculated as follows:no. of atoms = 2 × 6.02 × 10²³no. of atoms = 12.04 × 10²³no. of atoms = 1.204 × 10²⁴ atomsTherefore, the total number of atoms contained in 2.00 moles of nickel is 1.204 × 10²⁴ atoms.Learn more at: https://brainly.com/question/22552359?referrer=searchResults
Which of the following are advantages of the SI system?
(Select all that apply).
A) It is easy to change from one unit to another.
B) It allows scientists to compare experimental results.
C) All its units are based on the number 100.
D) It is based on inches and pounds.
A b c ar e the correect ones
The advantage of the SI system is that It is easy to change from one unit to another. Hence Option (A) is correct.
What is SI Unit ?SI unit is a global system of measurements that ar used universally in technical and research to avoid the confusion with the units.
Having a typical unit system is vital as a result of it helps the complete world to grasp the measurements in one set of unit systems.
The SI covers units for each style of measuring, however at the guts of the SI could be a set of seven units called the 'base units'.
This Systeme International d'Unites of Units is critical to confirm that our everyday measurements stay comparable and consistent worldwide.
Therefore, The advantage of the SI system is that It is easy to change from one unit to another. Hence Option (A) is correct.
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Which of the following is a correct description of a double bond between two carbon atoms?
A double bond will produce four single bonds to form a tetrahedral shape.
A double bond between carbon atoms will eventually form a ring of carbons.
A double bond between carbon atoms is longer than a triple bond between carbon atoms.
A double bond will quickly reduce to single bonds to create three-dimensional tetrahedra.
A 25.0L sample of gas at STP is heated to 55c at 605 torr. What is the new volume?
Final answer:
To find the new volume of the gas, we can use the combined gas law formula and solve for V2. By plugging in the given values into the formula, we find that the new volume is approximately 27.2 L.
Explanation:
To solve this problem, we can use the combined gas law formula, which relates the initial and final volume, temperature, and pressure of a gas:
V1/T1 = V2/T2
Given that the initial volume (V1) is 25.0 L, the initial temperature (T1) is 0°C, and the final temperature (T2) is 55°C, we can convert the temperatures to Kelvin by adding 273 to each value.
Plugging in the values, we get:
25.0 L / (273 K) = V2 / (273 K + 55°C)
Solving for V2, we find that the new volume is approximately 27.2 L.
A 3.5 gram sample of a radioactive element was formed in a 1960 explosion of an atomic bomb at Johnson Island in the Pacific test site. The half-life of the radioactive element is 28 years. How much of the original sample will remain in the year 2030? Show your work.
For every molecule of glucose, how many molecules of co2 are released in the citric acid cycle
Which statement best describes the oxidation numbers of the atoms found in magnesium chloride?
A. Magnesium has a 2+ oxidation number and chlorine has a 1- oxidation number. B. Magnesium has a 2- oxidation number and chlorine has a 2+ oxidation number. C. Magnesium has a 2- oxidation number and chlorine has a 1+ oxidation number. D. Magnesium has a 1+ oxidation number and chlorine has a 1- oxidation number.
What will happen to the pressure if another mole of gas is added to the cylinder but the temperature and volume do not change?
Complete each reaction for strong electrolytes in water.
a. cacl2(s) →
b. mg(no3)2 →
c. al2(so4)3 →
Strong electrolytes dissociate completely into ions in water. The resulting ions for CaCl2 are Ca2+ and Cl-; for Mg(NO3)2 are Mg2+ and NO3-; and for Al2(SO4)3 are Al3+ and SO4−2.
Explanation:In water, strong electrolytes dissociate completely into their ions.
For CaCl2(s) in water: CaCl2(s) → Ca2+(aq) + 2Cl-(aq)For Mg(NO3)2 in water: Mg(NO3)2(s) → Mg2+(aq) + 2NO3-(aq) For Al2(SO4)3 in water: Al2(SO4)3(s) → 2Al3+(aq) + 3SO4−2(aq)Learn more about Strong Electrolytes here:https://brainly.com/question/29771118
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How many moles of nitrogen, n, are in 83.0 g of nitrous oxide, n2o?
There are approximately [tex]3.772[/tex] moles of nitrogen in [tex]83.0 g[/tex] of nitrous oxide [tex](N\(_2\)O)[/tex]
To determine the number of moles of nitrogen in [tex]83.0 g[/tex] of nitrous oxide [tex](N\(_2\)O)[/tex], we need to follow these steps:
1. Calculate the molar mass of [tex]N\(_2\)O[/tex]:
Nitrogen ([tex]N[/tex]) has a molar mass of approximately [tex]14.01 g/mol.[/tex]
Oxygen ([tex]O[/tex]) has a molar mass of approximately [tex]16.00 g/mol.[/tex]
The molar mass of [tex]N\(_2\)O[/tex] is:
[tex]\[\text{Molar mass of N}_2\text{O} = 2 \times 14.01 \, \text{g/mol} + 16.00 \, \text{g/mol} = 28.02 \, \text{g/mol} + 16.00 \, \text{g/mol} = 44.02 \, \text{g/mol}\][/tex]
2. Calculate the number of moles of [tex]N\(_2\)O[/tex] in [tex]83.0 g[/tex]:
[tex]\[\text{Number of moles of N}_2\text{O} = \frac{83.0 \, \text{g}}{44.02 \, \text{g/mol}} = 1.886 \, \text{moles}\][/tex]
3. Determine the number of moles of nitrogen atoms in [tex]N\(_2\)O[/tex]
Each molecule of [tex]N\(_2\)O[/tex] contains [tex]2[/tex] nitrogen atoms. Therefore, the number of moles of nitrogen atoms is twice the number of moles of [tex]N\(_2\)O.[/tex]
[tex]\[\text{Number of moles of nitrogen atoms} = 2 \times 1.886 \, \text{moles} = 3.772 \, \text{moles}\][/tex]