What is the concentration in molarity of a solution which is 2.91 %m/v benzene (C₆H₆, MM =78.11 g/mol ) in CCl₄ (MM = 153.81 g/mol)?

The volume of the base, LiOH required to reach the halfway point will be 170.6 mL.

The balanced chemical equation for this reaction will be:

HCOOH +LiOH → HCOOHLi + [tex]H_{2}O[/tex]

It can be observed that,

The mole ratio of HCOOH ([tex]n_{a}[/tex], acid) = 1

The mole ratio of LiOH ([tex]n_{b}[/tex], base) = 1

Volume of acid, HCOOH ([tex]V_{a}[/tex] = 64.0 mL

Molarity of acid, HCOOH ([tex]M_{a}[/tex]) = 0.4 M

Molarity of base, LiOH ([tex]M_{b}[/tex]) = 0.150 M

The volume of a base can be determined by the formula:

Ma×Va / Mb ×Vb = nA / nB.....(i)

Now, put the given data in above formula:

(0.4 × 64) / (0.150 × [tex]V_{b}[/tex]) = 1

25.6 / (0.150 × [tex]V_{b}[/tex]) = 1

By solving it:

0.150 × [tex]V_{b}[/tex] = 25.6

[tex]V_{b}[/tex] = 25.6 / 0.150

[tex]V_{b}[/tex] = 170.6 mL

Therefore, the volume of the LiOH required to reach the halfway point will be 170.6 mL.

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When salt dissolves in water, dissociation occurs. This dissociation forms two ions, one positive and one negative. Water is polar and its molecules has poles negatives and positives. So positive poles of water will surround the negative ions. While negative poles will surround the positive ions.

Answer: Alternative "B"

Step 1

The reaction must be written, completed, and balanced:

2 NaOH + H2SO4 => Na2SO4 + H2O

-----------

Step 2

Information provided:

Mass of NaOH = 40.0 g

Mass of H2SO4 = 60.0 g

--

Information needed:

The molar masses:

NaOH) 40.0 g/mol approx.

H2SO4) 98.0 g/mol approx.

-----------

Step 3

The limiting reactant?

By stoichiometry:

1 mole NaOH = 40.0 g

1 mole H2SO4 = 98.0 g

2 NaOH + H2SO4 => Na2SO4 + H2O

2 x 40.0 g NaOH ----------- 98.0 g H2SO4

40.0 g NaOH ----------- X

X = 40.0 g NaOH x 98.0 g H2SO4/2 x 40.0 g NaOH = 49.0 g H2SO4

For 40.0 g of NaOH, 49.0 g of H2SO4 is needed but is provided 60.0 g of H2SO4. Therefore, the excess is the H2SO4, and the limiting reactant is the NaOH.

Answer: the limiting reactant is NaOH

The third law of thermodynamics states that the entropy of a system approaches a constant value as the temperature approaches absolute zero.

Or:

The third law of thermodynamics states, regarding the properties of closed systems in thermodynamic equilibrium: The entropy of a system approaches a constant value when its temperature approaches absolute zero.

According to the concept of molar concentration,0.715 g of hydrogen iodide are dissolved in the solution.

Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.

The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.

In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.

Using the formula of M₁V₁=M₂V₂ molarity of HI is determined,that is ,M₂=0.25×22.4/15=0.373 M.

For determining the mass is determined by using the formula,mass=0.373×127.911×0.015=0.715 g

Thus, 0.715 g of hydrogen iodide are required for making the solution.

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There are only two electrons that could posses the quantum numbers as shown.

We now that it is often common to seek to describe the probability of finding the electrons in the atom. While it is know that the electron is not a given point in the atom. The probability of finding the electron in the atom is given by the help of the quantum numbers that can be used to describe the position of the electron as shown.

In tis case, we have an electron that has the quantum numbers; n = 3, l = 2, ml = -2. This describes an orbital and there are two electrons in a given orbital.

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Answer:

1.11 x 10²³ atoms O

Explanation:

To find the number of oxygen atoms in FeSO₄, you need to (1) convert FeSO₄ from grams to moles (using the molar mass), then (2) convert moles FeSO₄ to moles O (using the mole-to-mole ratio of FeSO₄), and then (3) convert moles O to atoms O (using Avogadro's Number). It is important to arrange the conversions/ratios in a way that allows for the cancellation of units (the desired unit should be in the numerator). The final answer should have 3 sig figs like the given number (7.00 = 3 sig figs).

Atomic Mass (Fe): 55.845 g/mol

Atomic Mass (S): 32.065 g/mol

Atomic Mass (O): 15.999 g/mol

Molar Mass (FeSO₄): 55.845 g/mol + 32.065 g/mol + 4(15.999 g/mol)

Molar Mass (FeSO₄): 151.906 g/mol

1 mole FeSO₄: 1 mole Fe, 2 mole S, 4 moles O

Avogadro's Number:

6.022 x 10²³ atoms = 1 mole

 7.00 g FeSO₄             1 mole                 4 moles O            6.022 x 10²³ atoms
-----------------------  x  -------------------  x  -----------------------  x  ----------------------------
                                   151.906 g           1 mole FeSO₄                  1 mole

=  1.11 x 10²³ atoms O

Given Data:

Concentration of acid, H2SO4 = 2.59 M

For, H2SO4, n-factor = 2, i.e., the number of [tex]H^{+}[/tex] ions on dissociation

Thus, the concentration in normality, N1 = 2.59 x 2 = 5.18 N

Concentration of base, KOH = 0.827 M

For, KOH, n-factor = 1, i.e., the number of [tex]OH^{-}[/tex] ions on dissociation

Thus, the concentration in normality, N2 = 0.827 x 1 = 0.827 N

Volume of  base, V2 = 47.50 mL

Using the formula, N1 x V1 = N2 x V2, where, V1 = volume of acid

Thus, volume of acid required to neutralize, V1 = [tex]\frac{N_{2}X V_{2} }{N_{1} }[/tex] =  [tex]\frac{0.827 X 47.50}{5.18}[/tex]

                                                                               = 7.58 mL.

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Explanation:

Raoult's law states that the vapor pressure of a solvent that is a over a solution is equal to the vapor pressure of the pure solvent at the same temperature scaled by the mole fraction of the solvent.

Psolution = Xsolvent * P°solvent

Where Psolution is the vapor pressure of the solution, X is the molar fraction of the solvent and P°solvent is the vapor pressure of the pure solvent.

Our solvent is chloroform, we know its vapor pressure.

P°solvent = 120 mmHg

We still have to find the molar fraction of the solvent. The molar fraction of the solvent will be defined like:

Xsolvent = moles of solvent/(total number of moles)

We know that the concentration of the solution is 0.200 m. That means that we have 0.200 moles of solute in each kg of solvent.

In order to find the mole fraction we have to suppose that the solution has 1 kg of solvent.

mass of solvent = 1 kg

molality = 0.200 m

molality = moles of solute/(mass of solvent in kg)

0.200 m = moles of solute/1 kg

moles of solute = 0.200 m * 1 kg

moles of solute = 0.200 moles

So our solution has 0.200 moles of solute in 1 kg of solvent. The solvent is chloroform (CHCl₃). We can convert the mass of solvent into moles using the molar mass of it.

molar mass of CHCl₃ = 119.38 g/mol

mass of solvent = 1 kg = 1 kg * 1000 g/kg

mass of solvent = 1000 g

moles of solvent = 1000 g * 1 moles/(119.38 g)

moles of solvent = 8.377 moles

Our solution has 8.377 moles of solvent and 0.200 moles the non-volatile solute.

total number of moles = moles of solute + moles of solvent

total number of moles = 8.377 moles + 0.200 moles

total number of moles = 8.577 moles

Xsolvent = moles of solvent/(total number of moles)

Xsolvent = 8.377 moles/(8.577 moles)

Xsolvent = 0.977

Finally we found the mole fraction of the solvent and we can find the answer to our problem.

Psolution = Xsolvent * P°solvent

Psolution = 0.977 * 120 mmHg

Psolution = 117.2 mmHg

Answer: The vapor pressure of the solution is 117.2 mmHg.

Answer:

A. There is an overall energy increase when bonds form.

Explanation:

Remember that when a chemical reaction occurs, molecular bonds are broken and other bonds are formed to make different molecules. For example, the bonds of two water molecules are broken to form hydrogen and oxygen. Energy is always required to break a bond, which is known as bond energy but we release energy when we form a bond.

Many atoms are unstable because they have to comply with the octet rule, so they form bonds with other atoms and the energy is released. So based on this logic, the answer would be A. There is an overall energy increase when bonds form.

Answer:

Explanation:

Carbon is the only element listed. Carbon Dioxide consists of Carbon AND Oxygen x2 so this is a compound. As stated earlier, air is a mixture of compounds. Water is another compound consisting of Hydrogen x2 and Oxygen.

The general molecular equation is; [tex]Ba(CH3COO)_{2} (aq) + Na_{3} PO_{4} ------ > Ba_{3} (PO_{4})_{2} (s)+ Na(CH3COO)_{2} (aq)[/tex] while the net ionic equation is; [tex]2PO_{4} }^{3-} (aq) + 3Ba^{2+ } (aq) ------- > Ba_{3} (PO_{4})_{2} (s)[/tex]

We can define the term reaction as the interaction that occurs between the reactants and helps us to be able to get a product as shown. Now we have a case in which we are asked to write the molecular, ionic and net ionic equation, with the phases of matter for the reaction between Barium acetate + Sodium phosphate --> Barium phosphate + Sodium acetate.

The task now is to make use of the ideas that we have from the question to be able to determine both the molecular reaction equation as well as the net ionic equation as required.

Let us no take the reaction individually. We can write the molecular reaction as;

[tex]Ba(CH3COO)_{2} (aq) + Na_{3} PO_{4} ------ > Ba_{3} (PO_{4})_{2} (s)+ Na(CH3COO)_{2} (aq)[/tex]

After we have written the molecular reaction equation, then we can identify the spectator ions as  acetate ion and the sodium ion as we can see from the balanced reaction equation.

The net ionic equation therefore is;

[tex]2PO_{4} }^{3-} (aq) + 3Ba^{2+ } (aq) ------- > Ba_{3} (PO_{4})_{2} (s)[/tex]

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The total number of electoral votes does Virginia have is 13. This addressed in congressional apportionment.

When people cast their vote, means they actually voting for the group of people called electors. Senator and representatives are equal to the number of voters in each state . According to the question , Virginia has 11 people in the house and 2 senate means 11 + 2 = 13 . the total number of electoral votes are 13. These votes are assigned by united states electoral college. In the constitution the congressional apportionment is addressed.

Thus, Virginia has 11 people in the House and 2 in the Senate. The total number of electoral votes does Virginia have is 13. This addressed in congressional apportionment.

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The IUPAC name of the structure (9) is 4-ethyl-2,3-dimethyl-heptane.

The first step is to select the longest, most substituted carbon chain containing a functional group is chosen. Then the identification of the primary suffix indicates the degree of saturation such as 'ane' or 'ene.

Then the identification of the secondary suffix indicates the functional group present in the molecule which depends on the number of occurrences of the same functional group such as di. tri tetra etc. Carbon atoms in the carbon chain are numbered from the reactive end of the molecule where the functional group is present.

In the given structure the longest carbon chain of seven carbon atoms. The methyl groups are present at the second and third position and the ethyl group is present at the fourth position. All the bonds in the structure are single bonds so the suffix is 'ane'. Therefore, the IUPAC name is 4-ethyl-2,3-dimethyl-heptane.

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The name for MgBr2 is Magnesium bromide

The question requires us to determine the mass number of an atom with 37 protons, 50 neutrons and 37 electrons.

The atomic number of an atom is determined by its number of protons, while the mass number of an atom is defined as the sum of number of protons and number of neutrons.

Therefore, we can calculate for the atom given by the question:

Therefore, the mass number of this atom is 87 and the best option to answer the question is letter D.

Answer

A. -1305 kJ

Explanation

Given:

Equation: C2H4(g) + 302(g) ---- > 2C02(g) + 2H20(l).

Formation ΔH values:

​​for C2H4(g) = 52.30 kJ/mol,

for 02(g) = 0 kJ/mol,

for CO2(g) = -393.5 kJ/mol, and

for H20(1) = -285.8kJ/mol.

What to find:

The ΔHrxn from the ΔH of formation for the given reaction.

Step-by-step solution:

ΔHrxn = (Sum of ΔH formation for the product) - (Sum of ΔH formation for the reactants).

ΔHrxn = (ΔH for 2CO2(g) + ΔH for 2H2O(l)) + (ΔH for C2H4(g) + ΔH for 3O2(g))

ΔHrxn = [(2 x -393.5) + (2 x -285.8)] + [52.30 + (3 x 0)]

ΔHrxn =(-787.0 - 571.6) + (52.30 + 0)

ΔHrxn = -1358.6 + 52.30

ΔHrxn = -1306.3 kJ

so the closest answer is A. -1305 kJ

Answer:

It was started by the FBI

Sulphur has a larger atomic radius than chlorine, even though chlorine has more protons, neutrons and electrons because sulfur is to the left of chlorine in the periodic table.

Atomic radius is defined as the distance between the atomic nucleus of an atom to the electron which is located at the outermost shell of the atom.

In the periodic table, the elements are being arranged in groups and periods with respect to their various atomic mass and numbers.

The atomic radius decreases across the period but increases down the group of the periodic table.

Therefore, sulphur would probably have a larger atomic radius when compared with chloride because it is located to the left of chloride in the periodic table.

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Final Molarity of acetate ion is 0.0394 M. The number of moles of solute per liter of solution is referred to as molarity.

The amount of a substance in a given volume of solution is measured in molarity (M). Molarity is defined as the number of moles of a solute in one liter of solution. A solution's molarity is also known as its molar concentration.

Therefore,

We first assume that the reaction completes and that the volume of the reaction remains constant.

The balanced stoichiometric equation is as follows:

Ba(CH₃COO)₂ + (NH₄)₂SO₄ → BaSO₄ + 2NH₄(CH₃COO)

First, we must determine which reactant is in excess and which has been completely consumed by the reaction. To do so, we count the number of moles of each reactant at the beginning of the reaction.

For Ba(CH₃COO)₂

The number of moles = (Mass)/(Molar Mass)

Barium acetate mass = 2.68 g

Barium acetate molar mass = 255.43 g/mol

The number of moles = (2.68/255.43) = 0.0104 moles.

For (NH₄)₂SO₄,

Number of moles = (Concentration in mol/L) × (Volume in L)

Concentration of Ammonium surface in mol/L = 45 M

Volume in L = (300/1000) = 0.3 L

Number of moles = 45 × 0.3 = 13.5 moles

From the stoichiometric balance of the reaction,

1 mole of Ba(CH₃COO)₂ responds with 1 mole of (NH₄)₂SO₄

As a result, it is clear that Ba(CH₃COO)₂ is the limiting reagent; the chemical specie that is depleted during the reaction and determines the number of other reactants and products formed.

1 mole of Ba(CH₃COO)₂ provide 2 moles of NH₄(CH₃COO)

0.0591 moles of Ba(CH₃COO)₂ will give 2 × 0.0591 moles of NH₄(CH₃COO); 0.1182 moles of NH₄(CH₃COO).

The molarity of NH₄(CH₃COO) exist then provide as (number of moles) ÷ (Vol in L)

The number of moles = 0.1182 moles

L volume of the solution = 0.3 L

Molarity of NH₄(CH₃COO) = (0.01182/0.3)

= 0.0394 M

Note that 1 mole of NH₄(CH₃COO) contains 1 mole of acetate ion,

Hence, 0.0394 M of NH₄(CH₃COO) also contains 0.0394 M of acetate ion.

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An Arrhenius base is a compound which ionizes to yield hydroxide ions (OH−) in aqueous solution.

Answer

a. 74.2

Explanation

Given that:

The initial temperature, T₁ = 63.2 °C + 273 = 336.2 K

Initial pressure, P₁ = 57.3 kPa

The final volume, V₂ = 15.56 mL

Final temperature, T₂ = 138.7°C + 273 = 411.7 K

Final pressure, P₂ = 334.6 kPa

What to find:

The initial volume, V₁.

Step-by-step solution:

The initial volume, V₁ can be calculated using the combined gas law equation.

Hence, its initial volume at 63.2 °C and 57.3 kPa is 74.2 mL

The pH of the resulting solution  is 10.9 .

given that :

for HClO₄

volume = 25 mL = 0.025 L

M = 0.30 M

no. of moles = 0.025 × 0.30

                     = 0.0075

for CH₃NH₂

no. of moles = 0.35 × 0.06

                    = 0.021

as a resultant no. of moles of CH₃NH₂ that remain in solution

= 0.021-0.0075

= 0.0135

total volume = 0.025 + 0.060

                     = 0.085

the concentration will be :

concentration for HClO₄ = 0.0075 / 0.085

                                         = 0.088 M

concentration for  CH₃NH₂ = 0.0135 / 0.088

                                             = 0.153

kb = 4.4 × 10⁻⁴

pkb = - log kb

pkb = 3.3

the pOH formula is given as :

POH = pKb + log [ acid ] / [ base ]

pOH = 3.3 + log [ 0.088 ] / [ 0.153 ]

pOH = 3.06

pH + pOH = 14

pH = 14 - 3.06

pH = 10.9

Thus, The pH of the resulting solution when 25.0mL of 0.30M HClO₄ is added to 60.0ml of 0.35 M CH₃NH₂. Kb forCH₃NH₂ = 4.4 × 10^-4 . pH is 10.9.

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Answer:

B. The percent yield is 55.9%.

Explanation:

From the balanced reaction we know that 2 moles of FePO4 produce 1 mole of Fe2(SO4)3.

1st) It necessary to convert moles into grams, using the molar mass of FePO4 (151g/mol) and the molar mass of Fe2(SO4)3 (400g/mol):

- FePO4 conversion:

- Fe2(SO4)3 conversion:

In this case, it is not necessary the conversion, because there is 1 mole, so it is equal to 400g.

Now we know that 302g of FePO4 produce 400g of Fe2(SO4)3.

2nd) Now we have to calculate the Theoretical yield of Iron (III) sulfate, that is, the amount of Iron (III) sulfate that we must produce from 25g of Iron (III) phosphate:

So, the Theoretical yield is 33.11g.

3rd) Finally, we can calculate the Percent yield using the Theoretical yield (33.11g) and the Actual yield (18.5g):

So, the percent yield is 55.9%.

The final pressure of the sample gas based on the new volume and temperature would be 0.245 atm.

The combined gas law is expressed as:

[tex]\frac{p_1v_1}{t_1}[/tex] = [tex]\frac{p_2v_2}{t_2}[/tex]

Where

In this case, we were given all the variables except the final pressure, [tex]p_2[/tex]:

Making p2 the subject of the formula in the combined gas equation, we have:

[tex]p_2[/tex]= [tex]p_1v_1t_2/t_1v_2[/tex]

Next, let's substitute the given variables:

[tex]p_2[/tex]= 1.2 x 6.02 x 20.2/59.5 x 10.0

     = 145.9248/595

     = 0.245 atm

In other words, the final pressure when the sample of gas is administered to a new volume of 10.0 L at 20.2℃ is 0.245 atm'

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1)Isotopes of certain radioactive elements that spontaneously emit radiation and rays from the nuclei.

2)In a nuclear fusion reaction, two small, light 'nuclei' (hydrogen atoms) combine under extreme 'temperature' and pressure to form one larger, heavier nucleus (helium).

The Sun and other stars are powered by nuclear fusion reactions. A heavier nucleus is created when two light nuclei fuse together in such a fusion reaction. So because mass of the emerging single nucleus is smaller than that of the combined mass of the two initial nuclei, the process generates electricity. Remaining mass is converted to energy.

Normal electrostatic forces between positively charged nuclei prohibit them from coming close enough to smash and allow fusion to occur, hence fusion is not feasible.

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Answer:

Explanation:

the answer is D

Answer:

D

Explanation:

capillaries veins and arteries

Answer: the second one

Explanation:

Answer:

there's no answer choices?