The temperature (in k) will be 126.509 K
Number of moles of Oxygen = 0.0938 mol
Pressure = 740 torr or 98658.6 Pa
Volume = 1.0 L or 0.001 m3
Temperature in K = ?
To find out the temperature (T) we use the ideal gas equation
PV = nRT
As we have to find the temperature so rearrange the equation for T
T = PV / nR
value of R = 8.314 J/mol.K
Put the values in the equation
V = 98658.6 * 0.001 / 0.0938 * 8.314
V = 0.000974 / 0.779853
V = 98.6596 / 0.779853
V = 126.509 K
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how many moles of potassium hydroxide would have to be added to 125 ml of a 0.420 m hydrocyanic acid solution, in order to prepare a buffer with a ph of 9.230?
0.021 moles of KCN are required, to prepare a buffer with a pH of 9.230
What is a buffer solution?A buffer, an aqueous solution consists of a mixture of a weak acid and its conjugate base or vice versa. Addition of a small amount of strong acid or strong base hardly changes the pH.
Given,
Volume = 125 mL
Concentration of HCN = 0.420 M
pH = 9.230
Moles of HCN = Volume × Concentration
= 0.125 × 0.420
= 0.0525 moles
HCN + KOH ⇄ KCN + H₂O
0.0525 + X ⇄ 0 [initially]
(0.0525 - X) + 0 ⇄ X [At equilibrium]
pH = pKₐ + log [salt]/[acid]
9.230 = 9.31 + log [salt]/[acid]
-0.08 = log [salt]/[acid]
0.83 = [salt]/[acid]
X / (0.0525 - X) = 0.83
X = 0.021 moles of KCN
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what mass of silver chloride can be produced from 1.11 l of a 0.156 m solution of silver nitrate? express your answer with the appropriate units.
The mass of silver chloride produced is 24.79g.
Given,
volume = 1.11 L
Molarity = 0.156 M
First, convert molarity to moles by multiplying by the volume:
0.156 M AgNO3 = (0.156 moles AgNO3)/1 L x 1.11 L = 0.173 moles AgNO3
We are only interested in AgCl, not AgNO3. We convert moles of silver nitrate to moles of silver chloride using the balanced equation. This is a 1:1 conversion:
0.173 moles AgNO3 x (1 mole AgCl)/(1 mole AgNO3) = 0.173 moles AgCl
To get mass from moles, we multiply by the molar mass:
0.173 moles AgCl x (143.32 g/mol) = 24.79 g AgCl
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write the net ionic equation for the reaction between agno3aq and na2so4aq. be sure to include states of matter in your answer.
The net ionic equation for the reaction between agno3aq and na2so4aq would be 2Ag+(aq) + SO4^2-(aq) → Ag2SO4(s)
The net ionic equation shows the chemical species involve in the chemical reaction while the complete ionic equation also involves the spectator ions. The net ionic equation state whether precipitation occurs or not. If the chemical reaction has no net ionic equation it means all are aqueous from no precipitation occurring.
AgNO3 → Ag+ + NO3-
Na2SO4 → 2Na+ + SO4^2-
2AgNO3(aq) + Na2SO4(aq) → 2Ag+(aq) + 2NO3-(aq) + 2Na+(aq) +SO4^2-(aq)
2Ag+(aq) + 2NO3-(aq) + 2Na+(aq) +SO4^2-(aq) → Ag2SO4(s) + 2NaNO3(aq)
2AgNO3(aq) + Na2SO4(aq) → Ag2SO4(s) + 2NaNO3(aq)
We cancel the spectator ions (NO3^- and Na^+)
the net ionic equation with states of matter is:
2Ag+(aq) + SO4^2-(aq) → Ag2SO4(s)
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why is it that carbon dioxide from carbonated beverages, pets, cattle, farm animals, and humans, yeast, dry ice, fireplaces, charcoal grills, campfires, wildfires, alcohol and ethanol is ok, and carbon dioxide from fossil fuel is bad?
The amount of carbon dioxide (CO2) released when burning fossil fuels is the primary factor in why fossil fuels are so destructive. The greenhouse effect and climate change are significantly impacted by the burning and release of CO2. Our planet warms because more CO2 in the atmosphere prevents sunlight from escaping back into space.
what are fossils?
A fossil is any preserved remnants, impression, or trace of any once-living organism from a previous geological epoch (from Classical Latin: fossilis, meaning "obtained by digging"). Bones, shells, exoskeletons, animal or microbe impressions in stone, items preserved in amber, hair, petrified wood, oil, coal, and DNA traces are a few examples.
The earth's natural mechanisms have controlled greenhouse gas output for millions of years. At a pretty constant rate, gases would be absorbed and released. Meanwhile, temperatures were kept at a level that allowed for the continuation of life on Earth. This is "a balancing act," according to the Environmental Protection Agency.As the Industrial Revolution got under way in the second part of the 1700s, humans began to alter the delicate balance. Since then, we have been continuously increasing the amount of greenhouse gases, particularly CO2, that are being injected into the atmosphere. These gases trap heat and cause global warming. Despite the fact that there are many greenhouse gases, some of which are more powerful than others, CO2 currently accounts for about 84 percent of all greenhouse gases produced by human activity, or about 30 billion tonnes annually.Although forestry and industrial operations also make significant contributions, the majority of this is caused by burning fossil fuels for transportation and power.
CO2 levels were at 270 parts per million before the Industrial Revolution (ppm). In 1960, CO2 concentrations were at 313 ppm.
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Draw a valid lewis structure for methane, ch4. What is the formal charge on the carbon atom?.
Methane is the common name for methane. In the organic molecule, it is the simplest hydrocarbon and a hydride of carbon. Tetrahedral in shape and with an exact bond angle of 109.50 in Lewis structure.
The methane molecule has the Lewis structure, Dots are used to indicate the positions of electrons surrounding the atoms in a molecule, while lines or pairs of dots are used to represent covalent connections between atoms in a Lewis structure. The goal of creating a Lewis dot structure is to locate the molecules' lone electron pairs in order to establish how chemical bonds are formed. Natural gas's primary component and the simplest alkane is methane, a chemical molecule with the molecular formula methane (one carbon atom bound to four hydrogen atoms).
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which of the following carbonate compounds is soluble in water? select the correct answer below: ag2co3 caco3 (nh4)2co3 pbco3 feedback
Alkali carbonates are soluble in water so (NH₄)2CO₃ sodium carbonate and potassium carbonates are soluble in water.
What is compounds and examples?A composite is a material comprised of two or more constituent parts. Examples of molecules are carbon dioxide, freshwater, and table salt. a substance produced by the chemical joining of two or three dissimilar components. Examples of compounds are salt (NaCl), which is made up of chloride and sodium atoms, and water (H2O), which would be made up of hydrogen and oxygen atoms.
How are compounds formed?When a group of atoms unite to form a pure material, a compound is created. These can be reduced to their individual atoms. Atoms from the reactants interact during chemical reactions to create new compounds. Reactants are the species that are reacting, while products are the results of the reaction.
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where was oxygen discovered?
Answer: nowhere from trees
Explanation:
how does gravity influence the motion of objects in the solar system
what mass, in grams, of cacl2 is required to prepare exactly 500 ml of a 0.24000000000000002 m solution of cacl2?
11.10 moles of cacl2 are required
Lets 0.24000000000000002m approx. be 0.2m
so, Molarity = 0.2m
volume = 500 ml
we know that
molarity = no. of moles of solute (cacl2) / volume of solutions
0.2m = n / 0.5 L
n = 0.1 moles of cacl2
now,
1 mole of cacl2 = 110.98 gm
so,
o.1 moles of cacl2 = 11.10 gm
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Chemical compound responsible for ocean acidification in the open oceans of the world.
Answer:
The chemical compound responsible for ocean acidification in the open oceans of the world is carbon(II) oxide
The chemical compound responsible for ocean acidification in the open oceans of the world is carbon(II) oxide.
What is ocean acidification?Ocean acidification is the global decrease in seawater pH caused by the oceans' extensive uptake of atmospheric carbon dioxide (CO2) in the atmosphere. Ocean acidification is primarily caused by the Earth's atmosphere being overburdened with massive amounts of CO2, which is created by automobiles, industrial processes, and agricultural activities.
A third to a half of the CO2 produced into the atmosphere by human activity since the start of the Industrial Revolution, or around 1750, is being absorbed by the oceans. Scientists believe that at that time, seawater's average pH decreased between 8.19 to 8.05, representing a 30% increase in acidity. The chemical compound responsible for ocean acidification in the open oceans of the world is carbon(II) oxide.
Therefore, the chemical compound responsible for ocean acidification in the open oceans of the world is carbon(II) oxide.
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Which statement about exothermic reactions is true?
The reactants have more heat energy than the products.
The reactants have more heat energy than the products.
Energy from an outside source is continuously being added.
Energy from an outside source is continuously being added.
More heat is given off than is put into the reaction.
More heat is given off than is put into the reaction.
The reaction container always feels cold.
The reaction container always feels cold.
The statement true about Exothermic reaction is
The reactants have more heat energy than the products.
What is exothermic reaction ?
A chemical reaction that releases energy is called exothermic. In an exothermic reaction, more energy is released forming a bond in the product than is used to break the bond in the reactants. An exothermic reaction is accompanied by an increase in temperature of the reaction mixture.
If a reaction releases more energy than it absorbs, the reaction is exothermic and enthalpy will be negative. Think of this as an amount of heat leaving (or being subtracted from) the reaction. If a reaction absorbs or uses more energy than it releases, the reaction is endothermic, and enthalpy will be positive.
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which of the following statements is/are correct? 1. a diamagnetic substance is strongly attracted to a magnetic field. 2. substances that retain their magnetism after they are withdrawn from a magnetic field are called ferromagnetic. 3. most transition metals and all lanthanide metals are ferromagnetic
The following statements are correct 2 only.
A diamagnetic material is strongly attracted to a magnetic field. A material that retains its magnetism after being removed from a magnetic field is said to be ferromagnetic. Most transition metals and all lanthanide metals are ferromagnetic. Paramagnetic compounds are attracted to magnetic fields, whereas diamagnetic compounds are repelled by magnetic fields.
Paramagnetic compounds have unpaired electrons whereas in diamagnetic compounds all electrons have paired spins. They stick to ferromagnetic materials such as iron and ferrous objects such as steel. This includes everything from the steel body of your car to your refrigerator door. It is also attracted to nickel, cobalt, and other rare earth elements.
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In which of these statements are protons, electrons, and neutrons correctly compared?
Quarks are present in protons and neutrons but not in electrons.
Quarks are present in protons, neutrons, and electrons.
Quarks are present in neutrons and electrons but not in protons.
Quarks are present in protons and electrons but not in neutrons.
In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge. Neutron is neutral that is it has no charge. So overall the charge of nucleus is due to only proton, not by neutron. The correct option is option A.
What is atom?Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit.
Quarks are present in protons and neutrons but not in electrons. Quarks are sub-atomic particles that have mass, but not an integer of charge.
Therefore, the correct option is option A.
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when temperature and pressure are held constant, volumes can be used in gas-phase reaction stoichiometry because
Because of Avogardo Hypothesis, volumes can be used in gas phase reaction stoichiometry at constant temperature and pressure.
Avogadro's Law (also known as Avogadro's Hypothesis or Avogadro's Principle) is an experimental gas law that relates the volume of gas to the amount of gaseous matter present.
Avogadro's law states that "equal volumes of all gases at the same temperature and pressure have the same number of molecules". At constant temperature and pressure, (mol) of a gas is directly proportional.
For example, if two ideal gases, hydrogen and nitrogen, are mixed in equal amounts, they contain the same amount of molecules. This only happens if they are kept at the same pressure and temperature. This shows the ideal behavior of gases.
Let's look at this law mathematically: the overall law can be written as
V is directly proportional to n
or V = nK , K (a constant)
Amount of gas; “n” is the gaseous substance measured in moles. "k" is a constant defined for a specific pressure and temperature.
Comparing the same gas under different conditions, the law is : V₁/ n₁=V₂/ n₂
The equation shows that the number of moles of gas increases in proportion to the increase in gas volume. Therefore, the total number of atoms or molecules present in a given volume of gas is completely independent of the molar mass or size of the gas.
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Plant and animal cells are very similar, but they also contain certain differences. how are plant and animal cells different? choose three correct answers.
The plants and animal cells are different because:
-Vacuoles are much larger in plant cells than in animal cells because they hold more water to stay upright
-Plant cells have cell walls to provide a stronger external structure and animal cells do not.
-Special organelles called chloroplasts are found in plant cells and not in animal cells to allow them to produce their own food.
In the field of biology, cells can be described as the building blocks from which all life forms on Earth are built.
Plant cells have chloroplast through which light energy can be trapped. This light energy is used by plants to make their own food. The animal cells lack chloroplast because they do not make their own food.
Plants cells have the cell wall as the outermost covering whereas animal cells do not have a cell wall. The outermost covering of the animal cells is the cell membrane only.
A plant cell has a single, large vacuole in the middle of the cell that is used for maintaining turgidity and storing water. Animal cells do not have smaller and numerous vacuoles.
Although a part of your question is missing, you might be referring to this question:
Plant and animal cells are very similar, but they also contain certain differences. how are plant and animal cells different? choose three correct answers.
Vacuoles are much larger in plant cells than in animal cells because they hold more water to stay upright
Animal cells contain a nucleus and plant cells do not
Plant cells have cell walls to provide a stronger external structure and animal cells do not.
Plant and animal cells are both completely the same and they have no differences.
Special organelles called chloroplasts are found in plant cells and not in animal cells to allow them to produce their own food.
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Having freckles (f) is dominant over not having freckles (f). a parent with freckles is crossed with a parent without freckles. the punnett square shows the possible genotypes of the offspring. what is the probability that an offspring will have a homozygous dominant genotype? 50% % what is the probability that an offspring will have a heterozygous genotype? 25% % what is the probability that an offspring will have a homozygous recessive genotype? 25% %
The homozygous dominant genotype is 0%, the heterozygous genotype is 50%, and the homozygous recessive genotype is 50%.
This problem does not display the Punnett box. If the genotype of the heterozygous parent has spots (Ff) and the other parent is homozygous without spots, the cross between the two parents is:
Parental: Ff >< ff
Gametes: F . f >< f
Filial: Ff (heterozygous having freckles) and ff (recessive homozygous over not having freckles)
The probability that the offspring will have a homozygous dominant genotype is 0%.The probability that the offspring will have a heterozygous genotype is 50%.The probability offspring will have a homozygous recessive genotype is 50%Learn more about a parent with freckles here https://brainly.com/question/12885435
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Answer: 0%, 50%, 50%
Explanation:
On US Interstate system, the maximum speed is 121km/h. How far will you travel if you
maintained this speed for 3 hours and 20 minutes?
The distance that will be traveled by me on the US interstate system will be 403.3 km.
What is distance?Distance is the total length between two points. Distance is the total movement of an object without any regard to direction. We can define distance as to how much ground an object has covered despite its starting or ending point.
To calculate the distance traveled;
d = Vt
Where;
d = Distance traveled by me
V = Maximum speed
t = Time
Given:
V = 121 km/h
t = 3 hours 20 minute = 10/3 hours
Substituting the values in the formula
d = 121×10/3
d = 403.3 km
In conclusion, the distance traveled by me will be 403.3 km.
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hydrochloric acid, hcl, is frequently used for titrations, but making a precise molarity of hcl is very difficult. instead, an approximate solution of hcl is made and then analyzed by titration with sodium hydroxide to determine its precise molarity. the titration reaction is hcl naoh nacl h2o. if 26.18 ml of 0.0995 m naoh is required to titrate 25.00 ml of hcl, what is the molarity of the hcl?
The molarity of the HCl 0.104 M
What is molarity?Molarity of a solute is defined as the ratio of number of moles of solute to the volume of solution (L). Solute molarity is sometimes omitted by enclosing the solute chemical formula in square brackets. For example, the concentration of chloride ions in solution can be written as [Cl⁻]. Molarity allows you to convert between the volume of a solution and the moles (or mass) of a solute.
For the given case,
HCl + NaOH --> NaCl + H2O
Since,
M₁V₁ = M₂V₂
M₁ = concentration of NaOH
V₁ = volume of NaOH
M₂ = concentration of HCl
V₂ = volume of HCl
Substitute the given values in the equation mentioned above:
26.18 × 0.0995 = M₂ × 25.00
2.60491 = 25 M₂
M₂ = 0.104 M
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Which of the following ions is a polyatomic ion?
OP³-
OOH
0²-
Mg
Polyatomic ion is OOH
Polyatomic ion are ion which consist of more than one atom and atom in a polyatomic ion are usually covalently bonded to one another and therefore stay together as a single or charged unit and here OOH there are two oxygen atom and one hydrogen atom that's it is polyatomic ion
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in aqueous solutions, excess hydrogen ions bind to nearby water molecules, so it is generally considered more accurate to write h (aq) as h3o (aq). what is the name of the h3o ion?
In aqueous solutions, excess hydrogen ions bind to nearby water molecules, so it is generally considered more accurate to write h (aq) as H₃O (aq) then name of the H₃O ion is hydronium ion
The hydrogen ion in aqueous solution is no more than proton and a bare nucleus although it carries only a single unit of positive charge and this charge is concentrated into a volume of space that is only about a hundred million as large as volume occupied by smallest atom in case of water this will be the lone pair electron of the oxygen atom and the tiny proton will be buried within the lone pair and will form a shared electron bond with it and creating a hydronium ion means H₃O⁺ and here H₂O is the base and the product H₃O⁺ is the conjugate acid of water
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a 40.0 ml sample of 0.25 m koh is added to 60.0 ml of 0.15 m ba(oh)2 . what is the molar concentration of oh- (aq) in the resulting solution? (assume that the volumes are additive.)
A 40.0 ml sample of 0.25 m KOH is added to 60.0 ml of 0.15 m Ba(OH)₂. the molar concentration of OH⁻ ion in the resulting solution is 0.28 M.
Given that :
volume of KOH = 40 mL = 0.04 L
Molarity of KOH = 0.25 M
volume of Ba(OH)₂ = 60 mL = 0.06 L
molarity of Ba(OH)₂ = 0.15 M
moles of OH⁻ in KOH = 0.04 × 0.25 = 0.01
moles of OH⁻ in Ba(OH)₂ = 2 (0.06 × 0.15) = 0.018
total no. of moles = 0.01 + 0.018 = 0.028 mol
total volume = 0.04 + 0.06 = 0.1 L
molarity of OH⁻ ion = moles / volume
= 0.028 / 0.1
= 0.28 M
Thus, A 40.0 ml sample of 0.25 m KOH is added to 60.0 ml of 0.15 m Ba(OH)₂. the molar concentration of OH⁻ ion in the resulting solution is 0.28 M.
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What is social anxiety disorder?
Answer:
You might get nervous and anxiety about meeting up in society
A chemist runs the following decomposition reaction: C2H6 → 2 C + 3 H2
If she starts with 50.0 g of C2H6, how many grams of carbon will be made?
according to the ideal gas law, a 0.9686 mol sample of oxygen gas in a 1.309 l container at 270.9 k should exert a pressure of 16.45 atm. what is the percent difference between the pressure calculated using the van der waals' equation and the ideal pressure?
The percent difference between the pressure calculated using the van der waals' equation and the ideal pressure is 5.89 %.
This can be calculated using van der waals' equation, followed by calculating pressure difference by: [P(ideal)-P(Van der waal's equation)/P(ideal)]*100
P(ideal) is given: 16.45
P(van der waals'): [tex](P+n2aV2)(V−nb)=nRT[/tex]
T= 270.9K
V=1.301 L
a for oxygen = 1.36 (L2 atm mol-2)
b for oxygen = 0.0319 (L mol-1)
n= 0.9686 mol
Using equation P(van der waals's) = 15.48 bar
and difference is 5.81%
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Please show your work!***
Remember, M (molarity) = moles of solute / liters of solution
1) What is the molarity of an aqueous solution containing 40g of C6H12O6 in a 1.5L of solution?
2) Calculate the molarity of a 1.60L of a solution containing 1.55g of dissolved KBr.
3) What is the molarity of an bleach solution containing 9.5g of NaOCl per 1L of bleach?
Answer:
1. 0.48 M 2. 0.00814 M 3. 0.1276 M
Explanation:
1. Convert the 40 g to moles using the molar mass of C6H12O6:
40 g C6H12O6/180.16 g C6H12O6 = 0.222 mol
Then divide the number of moles by liters to find molarity:
0.222 mol/1.5 L = 1.48 M
2. Convert the 1.55 g to moles using the molar mass of KBr:
1.55 g KBr/119 g KBr = 0.013025 mol
Then divide the number of moles by liters to find molarity:
0.013025 mol/1.60 L = 0.00814 M
3. Convert the 9.5 g to moles using the molar mass of NaOCl:
9.5 g NaOCl/180.16 g NaOCl = 0.1276 mol
Then you divide the number of moles by liters to find molarity:
0.1276 mol/1 L = 0.1276 M
g the electron geometry of a molecule depends on the number of regions of electron density around the central atom in a molecule. if a molecule presents 3 regions around the central atom, which would be the predicted electron geometry?
The predicted electron geometry is a trigonal planar geometry.
What is electron geometry?Molecular geometry is the three-dimensional arrangement of atoms that make up a molecule. This includes not only the general shape of the molecule, but also bond lengths, bond angles, torsion angles, and all other geometric parameters that determine the position of each atom.The arrangement of electron groups is determined by the number of electron groups. On the other hand, the molecular shape depends not only on the number of electron groups, but also on the number of lone pairs. If the electron groups are all bond pairs, they are named exactly like the electron group geometry. The two regions of electron density around the central atom of the molecule form a rectilinear geometry. The three regions form a trigonal planar geometry. Four regions form a tetrahedral geometry. The five regions form a trigonal bipyramidal geometry. Six regions form an octahedral geometry.To know more about electron geometry visit:
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An experiment was carried out to find
out how the mass of potato chips
changed when they were left in sugar
solutions of different strengths. The
table of results is shown below. Would
you expect the value of X to be more or
less than 2.5g?
Answer:
the answer would be more than 2.5g
Explanation:
the absorbance and fluorescence of a molecule are shown on a spectrum. what can be concluded about the features of the spectrum?
According to the given condition, the
absorbance
is the signal at the highest energy, or longest wavelength. The
fluorescence
is the signal at the lowest energy, or shortest wavelength.
Absorbance is the
logarithm
of the ratio of incident to transmitted radiant power through a sample. It is also known as the measure of the capacity of a substance to absorb light in a specific wavelength.
Fluorescence is the
emission
of light by a substance that has absorbed light or other electromagnetic radiation. Fluorophores are molecules that absorb light in a specific wavelength and emit light in another wavelength.
Absorbance is measured by the principle of
Beer-Lambert's
law. It is also known as Beer's law. It states that the attenuation of light to the properties of the material through which the light is travelling. It is commonly used in chemical analysis and measurements of physical optics for photons and neutrons.
In comparison with absorbance and fluorescence, it is important to consider the specificity of each method. In absorbance, a light of certain wavelength is passed through the solution to measure the optical density or concentration.
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1) PbBr₂ (1) What ions are present? Which one will move towards the cathode? Which one will move towards the anode? Write the anode half equation. Write the cathode half equation. f) Write the overall redox reaction.
The ions are present in cations and anions.
The cathode Positively charged cations.
The anode is negative ions.
The oxidation occurs is Zn(s) = Zn2+ (aq) + (2e-).
A redox reaction combines two half-reactions into one complete formula. Electrons lost in the oxidation half-reaction are gained in the reduction half-reaction. Thus, a redox reaction is a chemical reaction in which electrons are transferred between the two species.
A substance that is reduced in a chemical reaction is called an oxidizing agent and a substance that is oxidized is called a reducing agent. Example of the redox reaction of zinc and copper. A reaction is complete when it reaches equilibrium, that is when the concentrations of reactants and products stop changing. If the equilibrium constant is very large.
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14.what volume, in milliliters, of 6.0 m naoh is needed to prepare 175 ml of 0.20 m naoh by dilution?
5.83ml of NaOH is needed to prepare 175 ml of 0.20 m by dilution.
Dilution is the process of “lowering the concentration of a solute in a solution by simply adding more solvent to the solution, such as water.” Diluting a solution enables adding more solvent without adding more solute.
into formula to find out the volume is ;
[tex]V_{1}[/tex][tex]N_{1}[/tex] = [tex]V_{2}N_{2}[/tex]
where [tex]V_{1}[/tex]= ?
[tex]V_{2}[/tex] = 175ml
[tex]N_{1}[/tex] = 6
[tex]N_{2}[/tex] = 0.2
So, ⇒ [tex]V_{1}[/tex]×6 = 175×0.2
[tex]V_{1}[/tex] = 5.83 ml
So, 5.83ml of NaOH is needed to prepare 175 ml of 0.20 m by dilution.
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