How many grams of KNO3 are needed to make 1. 50 liters of a 0. 50 M KNO3 solution?

Answer:

About 56.3 grams of H2O

Explanation:

This problem is providing us with the mass of solid sodium chloride and the volume of water it was dissolved in. Thus, after diluting it, the volume of the stock solution was required and found to be 60. mL according to:

In chemistry, when we are given a stock solution with specified volume and concentration, one is able to dilute it in order to use it for a specific purpose. This, by holding the number of moles constant, one can write:

\(C_1V_1=C_2V_2\)

Where the subscript 1 stands for the stock solution and 2 for the diluted one. Thus, one first calculate the initial concentration with the mass and volume:

\(M=\frac{70.13g/(58.44 g/mol)}{0.400L}=3.00M\)

Next, we solve for the volume of the stock solution, V1, as follows:

\(V_1=\frac{C_2V_2}{C_1}\)

Finally, we plug in the given data to obtain the result:

\(V_1=\frac{1.2M*150mL}{3.00M}\\ \\V_1=60.mL\)

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The molar mass of the metal is 191.1g/mol.

Solution:

Since the formula for faraday's law of electrolysis is given by

Since m = 0.1427g, I = 144.2mA = 144.2mA *(1A/1000mA) = 0.1442 A= 0.1442C/s, t = 16min39s = 16min*(60s/1min) = 960+39 = 999 second Z = 2e-mol

Now put all values in the above formula

0.1427 g = (0.1442 C*999s*M*1 mole e-*1 mol/96485C*s*2e-mol)

M = (0.1427g*96485*2/0.1442*999*1)

M = 191.1538 g/mol = 191.1g/mol

Therefore the molar mass of metal will be 191.1g/mol.

For chemical elements that do not have isolated molecules such as carbon and metals, the molar mass is instead calculated by dividing by the number of atomic moles. Molar mass is defined as the mass in grams of one mole of a substance. The unit of molar mass is gram/mole, abbreviated g/mol.

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The diameter (in pm) of the metal atom is 312.54 pm

Atoms are organized in a cube to form a face-centered cubic unit cell structure, with six extra complete atoms placed in the center of each cube face and a fraction of an atom at each of the cube's four corners. The atoms in the cube's corner are shared by eight more unit cells.

We must apply the equation for a face-centered cubic laticce to respond to this question:

Edge length = 8 R

where R is the atom's radius.

Replacing:

442pm = √8 R

The atom's radius is R = 156.27pm.

diameter = 2 radii for as.

The metal atom's diameter is:

156.2 x 2 = 312.54 pm

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Answer:

Adding or removing protons from the nucleus changes the charge of the nucleus and changes that atom's atomic number. So, adding or removing protons from the nucleus changes what element that atom is! For example, adding a proton to the nucleus of an atom of hydrogen creates an atom of helium

Explanation:

Explanation:

Copper does not react with HCl to give H2 gas.

The answer is A [Ar]3d¹04s²4p4. This electron configuration represents the element Argon, which has the lowest electronegativity of the elements listed. Electronegativity is a measure of an atom's ability to attract electrons, so Argon has the lowest ability to do so.

Electron configuration is an arrangement of electrons in an atom or molecule in which each orbital is occupied by the maximum number of electrons with opposite spins. It describes the way that electrons are distributed among the available orbitals of an atom. Electron configuration is important because it determines the chemical properties of the atom, including reactivity and the way it bonds with other atoms. The distribution of electrons in an atom or molecule is determined by the quantum numbers associated with each electron. These quantum numbers indicate the energy, angular momentum, and other properties of the electrons. The electron configuration of an atom or molecule is determined by solving the Schrödinger equation for that particular atom or molecule.

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Step 1 - Understanding the law of mass conservation

In physics, chemistry and biology the law of mass conservation states that no atom is created or destroyed, they are only rearranged in any given physical/chemical/biological process.

Therefore, if all atoms are preserved, the total mass of reactants and products is the same.

Step 2 - Answering the exercise

The melting of an ice cube is a physical process and, as such, is also subjected to the law of mass conservation. Therefore, if 10g of ice melt, 10g of water are produced.

Answer: 10.0g

Answer:

D

Explanation:

Does not require energy ...may be slow or fast....

We can classify the given reaction as Synthesis Reactions are :  Ni + Cl₂ → NiCl₂,  C₃H₆ + Br₂ → C₃H₆Br₂. Decompositions Reactions are : CaCO₃ →  CaO + CO₂,2NaCl →  2Na + Cl₂, 2HI → H₂ + I₂. Single Displacement Reactions are : 2Fe + 6HCl →  2FeCl₃ + 3H₂. Double Displacement Reactions are : CaCO₃ +2HCl → CaCl₂ +H₂CO₃

In this type of reaction , two or more chemical components combine in order to form a complex product which is given as:                                                

A + B → AB

A kind of chemical reaction which only one type of reactant results to produce of two or more than two products.

A single displacement reaction which has an another name as single replacement reaction is a type of oxidation-reduction chemical reaction in which an ion or element moves out of compound.

A double displacement reaction is a type of chemical reaction which tells that the reactant ions exchange its's places in order to form new products.

Thus, From the above Conclusion we can say that,

Synthesis Reactions are :  Ni + Cl₂ → NiCl₂

                                           C₃H₆ + Br₂ → C₃H₆Br₂

Decompositions Reactions are : CaCO₃ →  CaO + CO₂

                                                      2NaCl →  2Na + Cl₂

                                                      2HI → H₂ + I₂

Single Displacement Reactions are : 2Fe + 6HCl →  2FeCl₃ + 3H₂

Double Displacement Reactions are : CaCO₃ +2HCl → CaCl₂ +H₂CO₃

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Note: The question is incomplete in the portal. Here is the complete question.

Question: Classify the following reactions as synthesis, decomposition, single replacement or double replacement.

Answer:

it is less dense than oxygen gas.

Explanation:

Hydrogen is the simplest chemical element that exists. The symbol for the chemical element Hydrogen is "H" and it is a colourless, tasteless, odorless, and highly flammable gas.

Hydrogen is a chemical element found in group (1) of the periodic table and as such it has one (1) electrons in its outermost shell. Therefore, Hydrogen has an atomic number of one (1) and a single valence electrons because it has only one proton and one electron in its nucleus.

In Chemistry, the properties of a chemical element that can be observed and measured without changing its chemical nature is known as a physical property. It includes density, color, freezing point, opacity, smell, melting point, viscosity, etc.

Hence, the statement which describes a physical property of hydrogen is that it is less dense (density) than oxygen gas.

Answer:

correct answer is d)

Explanation:

This answer demonstrates law of conservation of mass because the mass of the products is equal to the mass of reactants with the help of the coefficients which is the process known as balancing. This answer also includes the correct formulas, as Br is a gas so it MUST be written as Br2. hope this helps:)

2Al(s) + 3Br2(1) - 2AlBr3(s) is the  correct formulas and demonstrates conservation of mass.

Every action has an equal and opposite response, states Newton's Third Law. This indicates that any force applied to an item will have an equal and opposite-directed response force of the same magnitude. A force pair is the collective name for these connected forces.

Each individual object will have a different force pair with each other object in systems of numerous objects where all things interact. In the case of charged particles, the charge of each object will dictate the direction of each force in the force pair.

Similar charges will cause particles to repel one another by directing their forces away from one another. With their forces pointing in the same direction, particles with opposing charges attract one another.

Therefore, 2Al(s) + 3Br2(1) - 2AlBr3(s) is the  correct formulas and demonstrates conservation of mass.

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Answer:

A atomic number

Explanation:

not too sure

Answer:

Physical properties

Atomic mass: 55.845

Density: 7.87 g/cm3

Group: Transition metals

Electrons: [Ar] 3d6 4s2

Melting point: 1811 K

Boiling point: 3134 K

Discovered: Ancient times

Explanation:

hope this helps! :D

From the calculation, the molar mass of the solution is 141 g/mol.

We know that;

ΔT = K m i

K = the freezing constant

m = molality of the solution

i = the Van't Hoft factor

The molality of the solution is obtained from;

m = ΔT/K i

m = 3.89/5.12 * 1

m = 0.76 m

Now;

0.76 =  26.7 /MM/0.250

0.76 = 26.7 /0.250MM

0.76 * 0.250MM =  26.7

MM= 26.7/0.76 * 0.250

MM = 141 g/mol

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Answer: things arnent always as they seem

Explanation:

Answer:

it's a chemical Element

Explanation:

symbol He

atomic number 2.

Answer:

9.2% is the answer

Explanation:

In this question asking for the percent error of the students calculated density. The formula that will be given;

density = 9.78g/cm^3

d = 9.78g/cm^3

accepted is on the RT table S = 8.96g/cm^3

%error = (measured - accepted)/accepted * 100%

%error = (9.78 - 8.96/8.96) * 100%

%error = 9.15% or approximately 9.2%

Answer:

sorry i have no answer know

A mixed inhibitor that has a higher affinity for the enzyme compared to the substrate can affect the Michaelis-Menten constant (Km) in enzyme kinetics by increasing the value of Km.

Km is a measure of the substrate concentration required for half-maximal velocity and is a key parameter in describing enzyme catalysis. However, In the presence of a mixed inhibitor, the inhibitor molecule can bind to both the free enzyme and the enzyme-substrate complex with different affinities.

The binding of the inhibitor to the free enzyme reduces the number of active enzyme molecules available for catalysis while binding to the enzyme-substrate complex slows down the catalytic reaction. This leads to a reduction in the effective concentration of the enzyme-substrate complex, which in turn increases the apparent Km value.

In other words, the higher affinity of the mixed inhibitor for the enzyme reduces the efficiency of the enzyme-substrate complex formation, making it more difficult for the substrate to bind to the enzyme, hence increasing the value of Km. Therefore, a mixed inhibitor that has a higher affinity for the enzyme compared to the substrate can cause a decrease in the efficiency of enzyme catalysis, which is reflected in the increase in Km.

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Answer:

Explanation:

Enertia is an integral part of Newton's first law of motion.

It is the tendency of an object to stay at rest or to continue moving until and unless any external unbalanced force, (like, applied force or force of tension or frictional force ) is applied to either move it from rest or change its speed(in other words, accelerate it!!).

Example below, is of ball at rest (fig1) and if this ball is moving straight on a frictionless surface(like ice) it will keep moving!! until, we push it or pull it.

Answer:

Explanation:

The acceptable range of mass when you are asked to obtain 3.000g of NaCl would typically be within a certain margin of error, usually +/- 0.001g or 0.1%. This range represents the precision of the measurement. It is an indication of the degree of accuracy with which the measurement was made.

When requested to obtain 3.000g of NaCl, the acceptable range of mass would normally be 0.001g. The accuracy of the measurement is represented by this range.

This range denotes the measurement's accuracy, which is a gauge of how easily the findings may be repeated. The greatest variation from the goal mass of 3.000g that is deemed acceptable is 0.001g. The measurement is more accurate the lower the deviation. Depending on the goal of the experiment, the precision of the balance utilised, and the method's sensitivity, this precision need could change. A accuracy of 0.001g is often regarded as satisfactory for the majority of laboratory applications. When working with extremely reactive or dangerous compounds or for more important applications, an accuracy of 0.0001g or less can be necessary.

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Answer: 6

Explanation: 2*3=6

Answer:

Compression

Explanation:

Hi! When two convergent plates collide, they should create compressive pressure, or compression.

Answer: 0.72

Explanation:

550 mmHg x 1 atm/ 760 mmHg = 0.72 atm

Answer:

the 3rd one (0.01 cm the one selected already)

Explanation:

copper wire isn't excessively big, and it wraps around the pencil because its malleable. I think that the most accurate would be 0.01 cm

Answer:

as per given balanced equation one mole Zn produces 1mole Hydrogen

when reacted with excess acid.

So 3 moles Zn will give 3moles Hydrogen

Explanation:

According to the balanced chemical equation, one mole of Zn produces one mole of hydrogen . Therefore, 3.86 moles of Zn metal will produce 3.86 moles of hydrogen gas.

Mole ratio refers to the ratio of the number of moles of one substance in a chemical reaction to the number of moles of another substance in the same reaction.

It is derived from the balanced chemical equation for the reaction, which indicates the relative amounts of each substance involved in the reaction.

Mole ratio is important in stoichiometry, which is the study of the quantitative relationships between reactants and products in a chemical reaction.

The given chemical reaction is written as follows:

Zn + 2 HCl ⇒ ZnCl₂ + H₂

According to the balanced chemical equation, one mole of Zn produces one mole of hydrogen . Therefore, 3.86 moles of Zn metal will produce 3.86 moles of hydrogen gas.

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Answer:

3.38  Tablespoons

10.14 Teaspoons

0.21 U.S. Cups

0.18 Imperial Cups

0.20 Metric Cups

50.00 Milliliters

Explanation:

To determine the quantum numbers of the last electron in the magnesium ion (Mg2+), we need to first determine the electronic configuration of the ion.

The question is incomplete but I have to look at the electron configuration of the magnesium ion.

Magnesium (Mg) has an electronic configuration of 1s2 2s2 2p6 3s2, which means it has two electrons in the 3s orbital. When magnesium loses two electrons to form the Mg2+ ion, these electrons are removed from the 3s orbital, leaving a filled 1s orbital, filled 2s orbital, filled 2p orbital, and empty 3s orbital.

The quantum numbers of the last electron in the Mg2+ ion can be determined as follows:

Principal quantum number (n): The last electron is in the 2p orbital, so its principal quantum number is n=1.

Azimuthal quantum number (l): The azimuthal quantum number specifies the shape of the orbital and is given by the formula l = n-1. Therefore, the last electron has an azimuthal quantum number of l=1

Magnetic quantum number (m): The magnetic quantum number specifies the orientation of the orbital in space and can take integer values from -l to +l. Therefore, the last electron in the Mg2+ ion has a magnetic quantum number of m=-1, 0 or 1, since there is only one electron in the 2p orbital and it is spherically symmetric.

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