1. How many moles does 8. 19 L of gas at STP represent?



2. How many moles does 21. 7 L of gas at STP represent?

Answer:

Explanation:

If the energy of an atom is increased, an electron in the atom gets excited. To go back to its ground state, the electron releases energy. The energy of the light released when an electron drops in energy level is the same as the difference in energy between the two levels.

Viewed simply, electrons are arranged in shells around an atom’s nucleus. Electrons closest to the nucleus will have the lowest energy. Electrons further away from the nucleus will have higher energy. An atom’s electron shell can accommodate 2n2 electrons (where n is the shell level).

In a more realistic model, electrons move in atomic orbitals, or subshells. There are four different orbital shapes: s, p, d, and f. Within each shell, the s subshell is at a lower energy than the p. An orbital diagram is used to determine an atom’s electron configuration.

There are guidelines for determining the electron configuration of an atom. An electron will move to the orbital with lowest energy. Each orbital can hold only one electron pair. Electrons will separate as much as possible within a shell.

In an atom, electrons are arranged in shells that surround the nucleus, with each successive shell moving further away from the nucleus.

In physics, an energy level is any discrete value from a set of total energy values for a subatomic particle confined by a force to a limited space or for a system of such particles, such as an atom or a nucleus.

Energy levels are fixed distances from an atom's nucleus where electrons can be found. Electrons are tiny, negatively charged particles that move around an atom's positive nucleus. The steps of a staircase represent energy levels.

Around the nucleus, electrons are arranged in different shells. Each successive shell can only hold so many electrons. First, the innermost shell is filled. This shell can only contain two electrons.

Thus, this way, the electrons are arranged.

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Answer:

\(\% O=24.6\%\)

Explanation:

Hello!

In this case, since the by-mass percent of an element in a compound is computed by taking into account its atomic mass, the number of atoms in the molecules and the molar mass of the compound, we can write:

\(\% O=\frac{2*16.00}{130.18 } *100\%\\\\\% O=24.6\%\)

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Answer:

D

Explanation:

Answer:

the answer is D I did that one in 5th grade

Answer:

The mass

Explanation:

Weight changes throughout different planets, force from gravity also changes

Answer:

37

Explanation:

( 98.6 - 32 ) × 5(100c) ÷ 9(180f) = 37

Answer:

This question lacks options, the options are:

A. Group C: 32.1 g, 35.0 g, 25.0 g

B. Group B: 25.5 g, 25.0 g, 24.8 g

C. Group A: 28.5g, 28.4 g, 28.5 g

D. Group D: 20.0 g, 25.0 g, 30.09

The answer is C. GROUP A

Explanation:

Precision in measurements refers to the degree of closeness between the repeated or measured values irrespective of how close they are to the true or accepted value, which is 25g in this case.

The precision of a measurement can be determined by simply finding the range (highest - lowest) of the measurements. The lowest range represents the most precise. The measurements for each group are:

Group C: 32.1 g, 35.0 g, 25.0 g

Range = 35.0 - 25.0 = 10g

Group B: 25.5 g, 25.0 g, 24.8 g

Range = 25.5 - 24.8 = 0.7g

Group A: 28.5g, 28.4 g, 28.5 g

Range: 28.5 - 28.4 = 0.1g

Group D: 20.0 g, 25.0 g, 30.09

Range = 30.09 - 25.0= 5.09g

Based on the ranges of the measurements in each group, one would notice that Group A has the lowest range (0.1g), hence, GROUP A is the most precise.

Answer: group A

Explanation: I got the answer right on my quiz.

Answer:

Explanation:

Answer:  3597 kJ of heat

Explanation:

According to ideal gas equation:

\(PV=nRT\)

P = pressure of gas = 5.00 atm

V = Volume of gas = 8.00 L

n = number of moles = ?

R = gas constant =\(0.0821Latm/Kmol\)

T =temperature =\(25.0^0C=(25.0+273)K=298K\)

\(n=\frac{PV}{RT}\)

\(n=\frac{5.00atm\times 8.00L}{0.0821 L atm/K mol\times 298K}=1.63moles\)

As it is given :

1 mole of propane produces = 2220 kJ of heat

Thus 1.63 moles of propane produces = \(\frac{2200}{1}\times 1.63=3597kJ\)

Thus 3597 kJ of heat is produced

Answer:

The dark moths were now better camouflaged. As a result, dark moths had a greater chance of reproducing and passing on the alleles that made them dark. This led to a gradual increase in the proportion of dark moths until light moths became very rare in industrial areas. The moth populations in these areas had evolved.

The evolution of the peppered moth is an evolutionary instance of directional colour change in the moth population as a consequence of air pollution during the Industrial Revolution. The frequency of dark-coloured moths increased at that time, an example of industrial melanism.

Answer:

Explanation:

Rocco is making bonds when he prepares these compounds. Two pieces of evidence for this are:

The chemical reactions are written with an arrow pointing to the right, indicating that the reactants are being converted into products.

The reactions release heat, which is a sign of a chemical reaction occurring and bonds forming.

The bond type in these compounds is an ionic bond. Two pieces of evidence for this are:

The reactants in the chemical reactions consist of a metal (Li or Mg) and a nonmetal (Cl or Br), which are the types of elements that typically form ionic bonds.

The products of the reactions are compounds with a metal and a nonmetal, which also suggests an ionic bond.

The oxidation numbers of lithium and magnesium are +1 and +2 respectively. The oxidation number of chlorine and bromine are -1. Since the oxidation number of lithium is lower than the oxidation number of magnesium, lithium will lose an electron more easily than magnesium. So the reaction of lithium and chlorine is more favorable than magnesium and bromine. That's why Rocco is only getting half as much magnesium compound than lithium compound when preparing these chemicals. To increase his yield, Rocco can try to use a higher amount of magnesium or a lower amount of bromine in the reaction.

Kcat, also known as turnover number, is the maximum number of substrate molecules converted to product by a single enzyme molecule in a given unit of time. It is a measure of the enzyme's catalytic efficiency. Vmax, on the other hand, is the maximum rate of reaction when all enzyme molecules are saturated with substrate. Kcat and Vmax are related because Kcat is a component of the Michaelis-Menten equation that describes the relationship between enzyme activity and substrate concentration.

Specifically, Kcat is equal to Vmax divided by the enzyme-substrate complex concentration at which the reaction rate is half of Vmax (known as the Michaelis constant, Km).

The relationship between Kcat and Vmax can be expressed by the following equation:

Vmax = Kcat × [E]

In this equation, [E] is the concentration of the enzyme. By determining Kcat and Vmax, you can better understand the enzyme's efficiency and its ability to catalyze a reaction. Therefore, Kcat and Vmax are both important parameters in characterizing enzyme kinetics.

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Answer:

Q.1

Given-

Volume of solution-1 L

Molarity of solution -6M

to find gms of AgNO3-?

Molarity = number of moles of solute/volume of solution in litre

number of moles of solute = 6×1= 6moles

one moles of AgNO3 weighs 169.87 g

so mass of 6 moles of AgNO3 = 169.87×6=1019.22

so you need 1019.22 g of AgNO3 to make 1.0 L of a 6.0 M solution

1. the grams of \(\rm AgNO_3\) is 1019.22.

2. 10,192.2

Molarity is the measure of the concentration of any solute in per unit volume of the solution.

1. Volume is 1.0 l.

Molarity of solution -6 m

To find the mass of \(\rm AgNO_3\)

\(\rm Molarity = \dfrac{n}{V}\\\\rm 6 = \dfrac{n}{1}\\\\n = 6 \times 1 = 6\)

Mass of One mole of \(\rm AgNO_3\) is 169.87 g

Therefore, the mass of 6 moles will be

169.87 × 6 = 1019.22

2. Molarity of solution 6.0

Volume of solution is 0.1m

The mass of 6 moles will be

169.87 × 6 = 1019.22

\(\rm density = \dfrac{mass }{volume} \\\\\rm density = \dfrac{1019.22 }{0.1} = 10,192.2\)

Thus, the options are 1. 1019.22    2. 10,192.2

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Answer:

c

Explanation:

Whatever is left :

42.9 - 6.6 - 23 = 13.3 kpa

Answer:

13.3 kpa

Explanation:

The solutes in an aqueous solution of KF in order of increasing concentration are : Lowest concentration: K+ (aq),H+ (aq),OH- (aq),F- (aq),Highest concentration: HF (aq)

In an aqueous solution of KF, K+ ions come from the dissociation of KF, but KF is a strong electrolyte and dissociates almost completely, so the concentration of K+ ions is relatively high. H+ ions are present in water due to the self-ionization of water, but their concentration is relatively low. OH- ions are also present due to the self-ionization of water, but their concentration is lower than that of H+ ions. F- ions come from the dissociation of KF, so their concentration is higher than that of OH- ions. HF is a weak acid that partially dissociates in water, resulting in a higher concentration of HF compared to the other ions in the solution.

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Answer:

i believe lithium

Explanation: i hope this is right.

Manipulation of the independent variable directly, Extraneous variable control, Extraneous variable control, statistically correct for the variable's influence.

define experimental ?

relating to, based on, or having the nature of experiment: an experimental study. based on or derived from experience; empirical: experimental evidence. tending to experiment: an experimental artist. tentative or provisional: an experimental rule in football.

an experimental science. relating to, developed from, or founded on experiment: an experimental science. of the nature of an experiment; provisional:

The new software is still in the testing phase.

An experimental aeroplane is one that is in the process of being tested.

based on or drawn from experience; empirical: experimental knowledge.

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The reaction of elements x from group 2 with elements from group 7 of the periodic table will produce a compound where both cations and anions are present.

This group makes up the so-called alkaline earth metals and is made up of: beryllium, magnesium, calcium, strontium, barium and radium.

These elements make up what is called the manganese family and have the particularity of being metals with 7 valence electrons.

The valence electrons of manganese and its family of elements are distributed 2 in the last shell and 5 in the penultimate shell.

An example of a compound formed by manganese and alkaline earth is calcium permanganate. It is an oxidizing agent that is formed by a metallic cation of calcium and two anions of permanganate.

These compounds formed are powerful oxidants, which, even when they do not produce combustion, can accelerate that of other materials, leading to the formation of explosive mixtures.

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Answer:

displacement rxn takes place

Explanation:

Zn +FeCl2 → ZnCl2 +Fe

Answer:

Explanation:

Density of a substance is given by

From the question

mass of the wood = 180 g

Since the wood is a cuboid we can find the volume using the formula

Volume = length × width × height

From the question

length = 10cm

width = 6 cm

height = 4 cm

Volume = 10 × 6 × 4 = 240 cm³

Substitute the values into the above formula and solve for the Density

That's

We have the final answer as

Hope this helps you

Answer:

Engineering is all about solving problems using math, science, and technical knowledge. And engineers have solved a lot of problems in the world by designing and building various technologies. We have everything from machines that can breathe for you in hospitals to suspension bridges to computers we use every day. All of these things were once designed by engineers using the engineering design process.

Explanation:

Answer:

Students will have to use their brains to solve problems and challenges they will face to find a solution to cleaning up oil spills. Students will face failures after completing their solution, lots of research, and problems during the making of their solutions. What will work? What won't?

Explanation:

Hope this helps!

The theoretical yield of salicylic acid according to the balanced overall equation is found to be 1.6g.

The maximum mass of a product that can be produced in a chemical process is known as the theoretical yield. The balanced chemical equation can be used to calculate it. the limiting reactant's mass and relative formula mass. The percent yield is 100% if the theoretical and actual yields are equal. Because the real yield is frequently lower than the theoretical value, percent yield is typically lower than 100%.

Molar mass methyl salicylate = 152 g/mole

moles methyl salicylate present = 1.77 x 1/152= 0.0116 moles

Theoretical yield of salicylic acid = 0.0116 x 138g/mol = 1.6g of salicylic acid

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The data can show us that X ,Y and Z are all esters

The law of definite proportions, also known as Proust's Law, states that a given chemical compound always contains the same elements in the same proportion by mass.

This means that no matter how a compound is obtained or prepared, its elemental composition will always be the same. For example, water is always composed of hydrogen and oxygen in a ratio of 2:1, regardless of its source or method of preparation.

The law of definite proportions is a fundamental principle of chemistry and provides evidence for the atomic theory of matter.

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We were given the number of moles of NO produced and we used the formula to calculate the number of moles of O2 required. The answer is 0.94 mol,

The balanced equation for the reaction between gaseous ammonia (NH3) and oxygen gas (O2) is given below:

4 NH3(g) + 5 O2(g) → 4 NO(g) + 6 H2O(g)

From the balanced equation, we can see that 5 moles of O2 are required to produce 4 moles of NO.Therefore, to find out the moles of O2 needed to produce a given number of moles of NO, we can use the following formula:

Number of moles of O2 = (5/4) × Number of moles of NO

Now, let's substitute the given values:

Number of moles of O2 = (5/4) × 0.75 mol (rounded to 2 significant digits)= 0.94 mol (rounded to 2 significant digits)

Therefore, the moles of oxygen needed to produce 0.75 mol of nitrogen monoxide is 0.94 mol.

From the balanced equation, we can see that 5 moles of O2 are required to produce 4 moles of NO. Therefore, to find out the moles of O2 needed to produce a given number of moles of NO, we can use the formula: Number of moles of O2 = (5/4) × Number of moles of NO. In this case, we were given the number of moles of NO produced and we used the formula to calculate the number of moles of O2 required. The answer is 0.94 mol, rounded to 2 significant digits.

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The final temperature of the resulting water will depend on the heat energy required to raise the temperature of the ice and the heat energy required to melt the ice.

To calculate the final temperature of the resulting water, we need to consider the heat energy required to heat the ice and the heat energy required to melt the ice.

Heat energy to raise the temperature of ice:

The heat energy (q1) required to raise the temperature of the ice can be calculated using the equation:

q1 = m * C * ΔT

where:

m = mass of ice (118.00 g)

C = specific heat capacity of ice (2.09 J/g°C)

ΔT = change in temperature (final temperature - initial temperature)

Since the initial temperature is -10.0°C, the change in temperature is:

ΔT = Tfinal - Tinitial = Tfinal - (-10.0) = Tfinal + 10.0

Substituting the values into the equation, we have:

q1 = 118.00 g * 2.09 J/g°C * (Tfinal + 10.0)

Heat energy to melt the ice:

The heat energy (q2) required to melt the ice can be calculated using the equation:

q2 = m * ΔHfusion

where:

ΔHfusion = heat of fusion for water (334 J/g)

Substituting the values into the equation, we have:

q2 = 118.00 g * 334 J/g

The total heat energy added to the system is the sum of q1 and q2, which is equal to 67.0 kJ (67000 J). Therefore:

q1 + q2 = 67000 J

Now we have two equations, q1 = 118.00 g * 2.09 J/g°C * (Tfinal + 10.0) and q1 + q2 = 67000 J. By solving these equations simultaneously, we can find the final temperature (Tfinal) of the resulting water.

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Smoke comes off from the mystery liquid and crushed sugar because of change in energy.

The mystery liquid might be an acid. Carbon, hydrogen, and oxygen atoms make up sugar. In a highly exothermic process, the acid takes water from the sugar, producing heat, steam, and fumes of acid oxide. The reaction smells very much like caramel, minus the sulfury smell. The white sugar oxidizes and transforms into a black carbonaceous tube that protrudes from the beaker in the form of smoke.

Therefore, when the crushed sugar was added in that liquid it turned the sugar black and few seconds later, the smoke came off while leaving the beaker hot.

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Answer:

Last Column is:

Explanation:

98  ,   7.8   ,   371    and     0.98

Answer:

rest will do later mom is calling me plz understand promise will do it

Explanation:

Answer:

lol

Explanation:

its 5 points

Reaction is spontaneous at temperatures above 144.14 K.

To determine at what temperatures this reaction is spontaneous, we need to evaluate the Gibbs free energy change (ΔG) of the reaction using the formula:

ΔG = ΔH - TΔS

where ΔG is the Gibbs free energy change, ΔH is the enthalpy change, T is the temperature in Kelvin, and ΔS is the entropy change.

A reaction is spontaneous when ΔG < 0. To find the temperatures at which this reaction is spontaneous, we need to solve for T when ΔG = 0:

0 = ΔH - TΔS

Now, put in the given values for ΔH and ΔS:

0 = +23.25 kJ - T(+161.26 J/mol K)

First, we need to convert ΔH to J/mol:

23.25 kJ = 23,250 J

Now, put in value back into the equation:

0 = 23,250 J - T(161.26 J/mol K)

Rearrange the equation to solve for T:

T = 23,250 J / 161.26 J/mol K

T ≈ 144.14 K

So, the reaction is spontaneous at temperatures above 144.14 K.

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Answer:

mass = 78 grams

volume= 2*5*6=60cm^3

density =m/v

=78/60

13/10=1.3 g/cm^3

Explanation:

The mass of the block of metal would be 780 grams

The volume of the block of metal would be  60 centimeter³

The density of the block of the metal is 13 g/cm³

It can be defined as the mass of any object or body per unit volume of the particular object or body. Generally, it is expressed as in gram per cm³ or kilogram per meter³.

The density is the reciprocal of the specific volume of any substance.

ρ =m /v

As given in the problem a block of metal has dimensions of 2 cm by 5 cm by 6 cm. The block weighs 780 grams

The volume of the block of metal would be  = 2×5×6 centimeter³

                                                                         = 60 centimeter³

The mass of the block of metal = 780 grams

ρ =m /v

ρ = 780 /60 gram/ cm³

ρ = 13 g/cm³

Thus, the mass volume and the density of the block of the metal would be  780 grams , 60 centimeter³, and 13 g/cm³ respectively.

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