Answer:
D. A syringe pulls in air as the plunger is pulled back.
Explanation:
As per Charles’s law
At constant pressure for a given amount of a gas,
Volume is directly proportional to its temperature.
Directly proportional means when one increases the other one too will increase. That is when volume increases temperature too will increase. When volume decreases, temperature too will show a decrease.
Option A tells us that the volume of the hot air balloon increase due to the rise(increase) in temperature as the balloon is heated
Thus the expression is [tex]V \propto T[/tex]
[tex]\frac {V}{T} = k[/tex] where k is a constant
When there is a change in the volume and temperature the expression will be
[tex]\frac {V_1}{T_1} = \frac {V_2}{T_2}[/tex]
where [tex]V_1[/tex] and [tex]T_1[/tex] are the initial volume and initial temperature and [tex]V_2[/tex] and [tex]T_2[/tex] are the final volume and temperature.
Final answer:
The best example of Charles's Law is the increase in the volume of a hot air balloon as the air inside it is heated. This demonstrates the direct proportionality between the volume of a gas and its temperature when pressure and the amount of gas are constant. So the correct option is A.
Explanation:
The question pertains to Charles's Law, which states that the volume of a gas is directly proportional to its temperature (in kelvins), provided the pressure and the amount of gas remain constant. The best demonstration of Charles's Law among the given options is 'The volume of a hot air balloon increases as the air inside it is heated.' This is because as the air inside the balloon is heated, its molecules increase in kinetic energy, which leads to an increase in volume, causing the balloon to expand.
Topic 1: Significant Figures
1. Determine the number of significant figures in each of the following:
a. 0.7540
b. 12500
c. 10000.01
d. 1200
e. 1.04 * 103
f. 0.0080050
These are 6 questions and 6 answers, each with its explanation.
Answer:
a. 0.7540: 4 significant figures.b. 12500: 3 significant figures.c. 10000.01: 7 significant figures.d. 1200: 2 significant figures.e. 1.04 * 103: 3 significant figures.f. 0.0080050: 5 significant figures.Explanation:
a. 0.7540
When there are not digits (non-zero digits) before the decimal point, the significant digits are all the decimal digits from the first non-zero decimal. So, in this case, they are all the shown digits: 7, 5, 4, and 0, i.e. 4 significant figures.
b) 12500
When there is not decimal point, the significant digits include all the digits before only zeros appear. So, they are 1, 2, and 5, i.e. 3 significant figures.
When it is meant that all the digits are significan, a perod must be added, in this way: 12500. The last point is part of the number, it does not add value, but indicates that all the digits are significant.
c) 10000.01
This is the only number from the list with both decimal and non-decimal digits.
When there are digits before and after the decimal point, the significant digits include all the digits before the decimal point and all the decimal digits. So they are 1, 0, 0, 0, 0, 0, and 1, i.e. 7 significant digits.
d) 1200
Again, when there is not decimal point, the significant digits include all the digits before only zeros appear. So, they are 1 and 2, i.e. 2 significant figures.
The two last zeros do not count as significant digits. If the number were written 1200., i.e. showing a decimal point but without digits after the decimal point, then all the four digits were singnificant.
e) 1.04 × 10⁴
This number is written in scientific notation.
The numbers before the power of 10 are called mantissa.
For a number written in scientific notation, the significant digits are the digits in the mantissa, i.e. 1.04. So, the number of significant digits is 3 (1, 0, and 4).
f) 0.0080050
For a number with only decimal digits (there are not digits with value before the decimal point), the zeros after the decimal point and before the first non-zero digit do not count as significant figures. So, the significant figures are: 8, 0, 0, 5, and 0, i.e. 5 significant figures.
In the reaction between NaNO3 (aq) and Li2SO4 (aq), will a precipitate form?
No. This reaction produces no insoluble products.
Yes. Na2SO4 will precipitator
Yes. LiNO3 will precipitate.
Yes. Both Na2SO4 and LINO3 will precipitate.
No precipitate will form in the reaction between NaNO3(aq) and Li2SO4(aq). Both the products, sodium sulfate and lithium nitrate, are soluble in water as per most solubility rules.
Explanation:In the reaction between NaNO3(aq) and Li2SO4(aq), no precipitate will form. This is because both sodium sulfate (Na2SO4) and lithium nitrate (LiNO3), the products of this reaction, are soluble in water. According to solubility rules, most nitrates (NO3-) and sulfates (SO4 2-) are soluble, meaning they dissolve in water, hence no precipitate will form.
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In the reaction between NaNO3 (aq) and Li2SO4 (aq), no precipitate will form.
Explanation:In the reaction between NaNO3(aq) and Li2SO4(aq), a precipitate will not form. This is because both NaNO3 and Li2SO4 are soluble in water and will dissociate into ions when mixed. This means that no insoluble products are formed and there will be no precipitate.
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Define Aqua regia and write a short note on it
Answer:
Explanation:
Aqua regia is a strong and very concentrated acid formed by mixing Hydrochloric acid(HCl) and nitric acid.
The acid is very corrosive due to its formulation and it nearly reacts to dissolve all substances including the unreactive gold metal. It is formed by mixing the two acids in a proportion of 1:3, i.e HCl in 3 parts and nitric acid in 1 part.
The mixture dissolves a wide range of metals
How many moles of CO2 are produced when 45.0g of C6H6 react completely in the following equation? 2C6H6+ 15O2 → 12CO2 + 6H2O
The answer is in the photo
Answer : The moles of [tex]CO_2[/tex] produced are, 3.462 moles.
Explanation : given,
Mass of [tex]C_6H_6[/tex] = 45.0 g
Molar mass of [tex]C_6H_6[/tex] = 78 g/mole
First we have to calculate the moles of [tex]C_6H_6[/tex].
[tex]\text{Moles of }C_6H_6=\frac{\text{Mass of }C_6H_6}{\text{Molar mass of }C_6H_6}=\frac{45.0g}{78g/mole}=0.577moles[/tex]
Now we have to calculate the moles of [tex]CO_2[/tex]
The given balanced chemical reaction is,
[tex]2C_6_H6+15O_2\rightarrow 12CO_2+6H_2O[/tex]
From the balanced chemical reaction, we conclude that
As, 2 moles of [tex]C_6H_6[/tex] react to give 12 moles of [tex]CO_2[/tex].
So, 0.577 moles of [tex]C_6H_6[/tex] react to give [tex]\frac{12}{2}\times 0.577=3.462[/tex] moles of [tex]CO_2[/tex].
Therefore, the moles of [tex]CO_2[/tex] produced are, 3.462 moles.
Which of the following happens during a lunar eclipse?
A: Earth casts a shadow on the moon.
B: The moon casts a shadow on Earth.
C: Earth stops revolving in its orbit.
D: Earth starts revolving around the moon.
Answer:
The answer is A: Earth casts a shadow on the moon.
Explanation:
A lunar eclipse occurs when the earth passes between the sun and the moon, and the three of them are aligned. As the light of the moon that we see from the earth is actually the reflection of the sun's rays on it, when the earth is between the moon and the sun, it doesn't let the sun's rays to reach the moon, so what we see is the shadow of the earth over the moon.
what are the products of the combustion of a hydrocarbon
Answer:
Carbon dioxide, water, and heat.
Explanation:
Hydrocarbon combustion refers to the type of reaction where a hydrocarbon reacts with oxygen to create carbon dioxide, water, and heat. Hydrocarbons are molecules consisting of both hydrogen and carbon. They are most famous for being the primary constituent of fossil fuels, namely natural gas, petroleum, and coal.
Answer:
carbon dioxide, water vapor, and heat
what is the usual composition of acid etch?
Answer:
Here's what I get
Explanation:
The etching gel used in many dental procedures contains
10 % to 50 % phosphoric acid in water a thickening agent consisting of hydrocarbon polymers and a colloidal silica sol a colouring agent such as cobalt aluminate blue spinel (CoAl₂O₄) to make it visible on a tooth.What is the poH of a
2.6 x 10-6 M H+ solution?
Answer:
8.41
Explanation:
ap#3
A sample of water with a mass of 123.00 kg is heated from 25 C to 97 C. If the specific heat of water is 1 J-1 kg K-1 then how much energy is required?
Answer:
8,860 J = 8.86 kJExplanation:
The heat energy required to heat a substance may be calculated from the formula:
Q = m × C × ΔTWhere:
m = mass of substance = 123.00 kg of waterC = specific heat = 1 J⁻¹ kg K⁻¹ΔT increase of temperature = 97°C - 25°C = 72°C = 72 K.Then, substitute the numbers in the formula to get:
Q = 123.00 kg × 1 J⁻¹ kg K⁻¹ × 72 K = 8,856 J ≈ 8,860 J or 8.86 kJOb] The electrodes of a fuel cellare in contact with water and all
The electrodes are made of platinum rather than iron.
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State why iron is not a suitable metal for the electrodes of the cell.
Iron is unsuitable for fuel cell electrodes due to its reactivity and corrosion, whereas platinum is favored for being inert and stable in electrochemical reactions.
Iron is not a suitable metal for the electrodes of a fuel cell because it is reactive and can undergo corrosion, especially when in contact with water, leading to the degradation of the cell's performance. Instead, platinum is often used for electrodes because it is an inert metal that does not react during redox processes. This ensures that the platinum electrodes do not appear in the overall electrochemical reaction of the cell, thus maintaining their integrity and the efficiency of the fuel cell.
determines the type of element an atom is.
The number of neutrons
The number of electrons
o The number of protons
o The number of atoms
Answer: C. The number of protons
Explanation: because when you take or add protons to an element it becomes another element.
How much energy is required to melt 13.00 kg of ice at 273 K? The specific latent heat of fusion of ice is 3.36 x 10^5 J kg-1.
A. 1.19 x 10^9 J
B. 2.58 x 10^4 J
C. 4.37 x 10^6 J
D. 1174.83 J
You use the information given by the question about latent heat of fusion of ice and construct the following reasoning:
if you need 3.36 × 10⁵ J to melt 1 kg of ice
then you need X J to melt 13 kg of ice
X = (13 × 3.36 × 10⁵)/1 = 43.68 × 10⁵ J = 4.368 × 10⁶ J ≈ 4.37 × 10⁶ J
Answer : The amount of heat required is, (C) [tex]4.37\times 10^6J[/tex]
Explanation :
Formula used :
[tex]q=L\times m[/tex]
where,
q = heat required = ?
L = specific latent heat of fusion of ice = [tex]3.36\times 10^5J/kg[/tex]
m = mass of ice = 13.00 kg
Now put all the given values in the above formula, we get:
[tex]q=(3.36\times 10^5J/kg)\times (13.00kg)[/tex]
[tex]q=4.37\times 10^6J[/tex]
Therefore, the amount of heat required is, [tex]4.37\times 10^6J[/tex]
How many electrons that may bank in 1.6 g of methane
Answer:
6.022 x 10^23
Explanation:
There are 6.022 x 10^23 electrons that may bank in 1.6 g of methane.
10×6.023×10²²
6.023 ×10²³
Answer:
6.02 × 10^23
Explanation:
Number of moles of methane = 1.6/16 = 0.1
In one mole there are 6.02 × 10^23 atoms
Thus, in 0.1 mole there are 0.1 ×6.02 × 10^23 atoms =6.02 × 10^22 atoms
Hence total number of electrons = number of electrons present in CH4 × atoms present in 0.1 mole.
=10×6.02 × 10^22 =6.02 × 10^23
what is the name of an ion with a positive charge
Answer:
cation
Explanation:
Answer:
Cation
Explanation:
Cation is the name of an ion with a positive charge.
Cation is made electron loss.
Also, it means atoms forced into position or gained.
(As) in noble-has notion
Answer:
[Ar] 4s2 3d10 4p3
Explanation:
Arsenic is Element 33. It is the 15th element in the Fourth Row, following the noble gas Ar at the end of the Third Row.
Thus, its noble gas electron configuration is
[Ar] 4s2 3d10 4p3
a student adds 3.5 moles of solute to enough water to make a 1500mL solution. what is the concentration?
The answer is:
[tex]MolarConcentration=\frac{3.5moles}{volume(1.5L)}=2.33molar[/tex]
Why?Since there is not information about the solute but only its mass, we need to assume that we are calculating the molar concentration of a solution or molarity. So, need to use the following formula:
[tex]MolarConcentration=\frac{mass(solute)}{volume(solution)}[/tex]
Now, we know that the mass of the solute is equal 3.5 moles and the volume is equal to 1500 mL or 1.5L
Then, substituting into the equation, we have:
[tex]MolarConcentration=\frac{3.5moles}{1.5L}=2.33molar[/tex]
Have a nice day!
Hey there!:
Molarity, molar concentration, concentration in mol/L or concentration in quantity of matter is the ratio of the amount of matter of the solute (mol) by the solution volume (in liters), expressed in the Unit mol/L (molar).
Number of moles = 3.5 moles
1 L = 1000 mL
Volume in liters = 1500 mL / 1000 => 1.5 L
Therefore:
Molarity = number of moles / Volume in liters:
Molarity = 3.5 / 1.5
Molarity = 2.333 M
Hope this helps!
What contribution did Niels Bohr make to atomic theory?
A. He performed an experiment that determined the charge of the
electron
B. He made a model of the atom called the plum-pudding model.
C. He discovered that the photoelectric effect was caused by light
shining on metal
D. He made a model of the atom, with electrons circling the nucleus.
Answer: D
Explanation:
Just took the test
Final answer:
Niels Bohr's contribution to atomic theory was his proposal of the Bohr's Model, which introduced the concept of electron orbits and explained the atomic spectrum of hydrogen.
Explanation:
Niels Bohr made significant contributions to atomic theory by proposing a model of the atom in 1913 called the Bohr's Model. This model incorporated Rutherford's planetary model and explained the atomic spectrum of hydrogen. Bohr's model was based on the concept that electrons move around the nucleus in circular orbits at certain allowed radii, and it introduced quantum mechanics principles. However, it is important to note that Bohr's model has been superseded by more accurate and complex models in modern atomic theory.
How many moles of Fe304 are required to supply enough iron to prepare 0.171 mol Fe203?
Answer:
0.114 moles
Explanation:
Calculate available moles of Fe:
0.171 mol Fe₂O₃ × (2 mol Fe / mol Fe₂O₃) = 0.342 mol Fe
Now calculate moles of Fe₃O₄ needed:
0.342 mol Fe × (1 mol Fe₃O₄ / 3 mol Fe) = 0.114 mol Fe₃O₄
Balance the equation Ca0 + HNO3 arrow Ca(N03)2 + H20
Answer:
Explanation:
You don't normally do this, but you might start by balancing the complex ion which is NO3^-
There are 2 of these on the right side of the arrow so make two on the left.
CaO + 2HNO3 arrow Ca(NO3)2 + H2O
That looks balanced. Let's check it out.
Species Ca H NO3 O
Left 1 2 2 1 on the CaO
Right 1 2 2 1 on the H2O
Answer:
CaO + 2HNO3 ——-> Ca(NO3)2 +H2O
Explanation:
The atomic particles given off as a result of nuclear fusion are?
Answer:
Gamma Radiation maybe
Explanation:
The atomic particles given off as a result of nuclear fission are Beta and Alpha particles, so the only thing left is gamma radiation.
I hope this helps, and as always, I am joyous to assist anyone at any time.
Assume that temperature and number of moles of
gas are constant in this problem.
Use the graph to complete the statement below.
This graph shows that pressure and volume have
✓
a direct linear relationship
an inverse linear relationship
a direct nonlinear relationship
an inverse nonlinear relationship
The graph shows that pressure and volume have an inverse nonlinear relationship.
So, option D is correct one
Why graph shows that pressure and volume have an inverse nonlinear relationship at constant temperature and number of moles of gas ?The ideal gas equation is written as,
[tex]PV = nRT[/tex]
P is pressure of the gasV is the volume of the gasT is the temperature n is the number of moles of gas R is the universal gas constantAt constant temperature T and the number of moles of gas n, Pressure P is inversely proportional to the volume V.
P ∝ 1/V
Hence, graph should be inverse nonlinear and such type of graph is called rectangular hyberbola.
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Answer:
a
Explanation:
Which of the following is a heterogeneous mixture
A) A hot cup of coffee
B) Hot tea
C) A milk chocolate bar
D) A fruit salad
Answer: fruit salad
Explanation: it consists of different types of materials.
Among the following options, heterogeneous mixture is a fruit salad. The correct answer is D.
A heterogeneous mixture is a type of mixture in which the components are not uniformly distributed and can be visibly distinguished. In other words, the different substances or phases that make up the mixture are not evenly mixed at a microscopic level.
In a fruit salad, different fruits are mixed together, and their distinct components can be observed separately. The different fruits retain their individual characteristics and do not dissolve or blend completely with each other.
On the other hand, options A, B, and C are examples of homogeneous mixtures. In a homogeneous mixture, the composition is the same throughout the mixture, and there are no visible boundaries or phases.
Therefore, the correct choice for a heterogeneous mixture is option D) A fruit salad.
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What is one example of the use of an infrared sensor?
A. Information is relayed to a visually impaired individual about the location of objects.
B. Detecting the presence of humans trapped under collapsed buildings.
C. Bar code scanner tracks store inventory
D. Monitoring feed for farm animals to keep them healthy.
Answer: B. Detecting the presence of humans trapped under collapsed buildings.
Explanation: Infrared sensors are also capable of measuring the heat being emitted by an object and detecting motion. Infrared technology is found not just in industry, but also in every-day life. Televisions, for example, use an infrared detector to interpret the signals sent from a remote control.
In what way does the shape of a molecule affect how the molecule is
involved with living systems?
A. It determines the weight of the molecule.
B. It determines how the molecule functions.
C. It determines oxidation states present in the molecule.
D. It determines what elements are in the molecule.
Answer:
It determines how the molecule functions.- B.
The shape of a molecule affect the molecule involved in living systems by determining its molecular fractions. The correct answer is B. It determines how the molecule functions.
The shape of a molecule plays a crucial role in how it interacts with other molecules and biological systems. The three-dimensional structure of a molecule determines its chemical properties and how it interacts with receptors, enzymes, proteins, and other molecules within living systems. Here are a few ways in which the shape of a molecule affects its involvement with living systems:
Binding and recognition: The shape of a molecule is important for specific molecular recognition and binding interactions. For example, enzymes bind to specific substrates through complementary shapes, allowing them to catalyze chemical reactions. Similarly, receptors in cells recognize and bind to specific molecules, such as hormones or neurotransmitters, based on their shape.
Biological activity: The shape of a molecule can determine its biological activity. Small changes in the molecular structure, even in the form of stereochemistry or chirality (mirror image isomers), can significantly alter a molecule's biological activity. Enantiomers, which have identical chemical formulas but differ in their three-dimensional arrangement, can have different biological effects due to their distinct interactions with biological systems.
Pharmacokinetics: The shape of a molecule affects its absorption, distribution, metabolism, and excretion within an organism. The size and shape of a drug molecule, for instance, can determine its ability to cross biological barriers, interact with target molecules, and be metabolized or eliminated from the body.
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what is the concentration (M) of a solution with a pH of 9.52 ?
Answer:
[H⁺] = 3.02 x 10⁻¹⁰M
Explanation:
Given parameters:
pH of the solution = 9.52
Unknown:
Concentration of the solution
Solution
There is a relationship between the pH and concentration of a solution.
pH = -log₁₀[H⁺]
The unknown here is [H⁺],
Now making it the subject of the formula
[H⁺] = Inverse log₁₀(-pH)
[H⁺] = Inverse log₁₀(-9.52)
[H⁺] = 3.02 x 10⁻¹⁰M
Compound which posses same molecular formula but differ in each other in the structure of carbon chain is ?
Answer:
Two or more compounds are called structural isomers if they possess the same molecular formula but different structural formulas.
Explanation:
The molecular formula of a compound shows the number of atoms of each element in a single molecule. In addition to showing the number of atoms, the structural formula of a molecule shows how the atoms are arranged in that molecule.Two compounds are considered structural isomers if their molecular formulas are the same while they differ in their structural formulas.
For example, the molecular formula [tex]\mathrm{C_4H_{10}}[/tex] represents both butane and methylpropane. However, the two compounds differ in their structural formula. (See the structural formulas in the diagram attached.)
Butane is a straight-chain alkane, whereasMethylpropane is branched.Due to the difference in the structures of structural isomers, there's a good chance that they will show different chemical and physical properties. For example, the melting point of butane is higher than that of methylpropane. The straight-chain shape of butane allows its molecules to be stacked close to each other. That allows for greater intermolecular forces and, therefore, a higher melting point.
What are the characteristics of Archaebacteria?
A. they are single cells that have a nucleus and tend to live in extreme conditions.
B. they are single cells that lack a nucleus and tend to live in extreme conditions.
C. they are single cells that lack a nucleus and tend to live in moderate conditions.
D. they are single cells that have a nucleus and tend to live in moderate conditions.
Answer:
they are single cells that lack a nucleus and tend to live in extreme conditions.- B.
Answer:
Option (B).
Explanation:
Archaebacteria includes all the single celled prokaryotic organisms that are found in different shapes and size. These bacteria are more closely related to eukaryotes.
Archaebacteria can live in extreme conditions like hot hydrothermal vents, under highly acidic and alkaline conditions. Archaebacteria does not have any nucleus and membrane bound organelles.
Thus, the correct answer is option (B).
Point
Which solution is an example of a nonelectrolyte?
O
A. Sodium nitrate in water
O
B. Hydrogen chloride in water
C. Acetic acid in water
D. Iodine in hexane
SUBMIT
Answer:Iodine in hexane
Explanation:
An electrolyte is a solution that decomposes upon passage of direct current. An electrolyte must contain ions that dissociate under the influence of external direct current. Solution of ionic substances in polar solvents produce good electrolytes such as a solution of NaCl in water. However, a solution of a nonpolar substance such as iodine in a nonpolar solvent such as hexane is not an not electrolyte. Such solutions contain no ions and do not interact with direct current.
Nonelectrolytes are substances that don't ionize in water and don't conduct electricity. An example is Iodine in hexane because when it is dissolved, it does not produce ions contrary to other given examples which are electrolytes.
Explanation:Nonelectrolytes are substances that don't ionize in water and therefore don't conduct electricity. An example of a nonelectrolyte solution would be Iodine in hexane (D). This is because when iodine is dissolved in hexane, it doesn't produce ions. Other examples given, Sodium nitrate in water (A), Hydrogen chloride in water (B), and Acetic acid in water (C) are all examples of electrolytes because they produce ions when dissolved in water.
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How are the frequency and energy of an electromagnetic wave related? (2 points) As frequency increases, energy increases As frequency increases, energy decreases Energy remains constant as frequency changes Energy and frequency are not related
Answer:
As frequency increases, energy increases
Explanation:
The energy of electromagnetic waves increases as frequency increases. It is the wavelength that decreases when the energy of electromagnetic waves increases.
We can say a direct relationship exists between frequency and energy of electromagnetic waves.
The high energy waves in an electromagnetic spectrum are x-rays, ultraviolet rays etc. These waves also have a high frequency.
Frequency is the number of waves that passes a particular point per seconds. The more the frequency or the number of waves passing through, the more energy it is able to produce and release.
How many cups are in 4 liters?
1L = 4.2 cups
4 L = [?] cups
Answer:
16.8 cups
Explanation:
We are given that there are 4.2 cups in in 1 liter of a liquid and we are to find out the number of cups that there will be in 4 liters.
To find this out, we will use the ratio method.
We know that:
1 L = 4.2 cups
So we can write it as:
[tex]\frac{1L}{4 L} =\frac{4.2 cups}{x}[/tex]
[tex] x = 4 .2 \times 4[/tex]
[tex] x = 1 6 . 8 [/tex]
Therefore, there are 16.8 cups in 4 liters.
16.8 cups are in 4 liters. A conversion factor is a ratio that allows you to convert a quantity expressed in one unit to an equivalent quantity expressed in another unit.
It is used in various fields, such as physics, chemistry, engineering, and everyday measurements. Conversion factors are derived from the relationships between different units of measurement.
1 liter is equivalent to 4.2 cups. This conversion factor tells that for every 1 liter, we have 4.2 cups.
To find out how many cups are in 4 liters, multiply 4 liters by the conversion factor of 4.2 cups per liter:
4 liters x 4.2 cups/liter = 16.8 cups
So, 4 liters would have 16.8 cups. This means that if 4 liters of liquid are into cups, need 16.8 cups to hold it all.
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