What ratio of nitrogen and hydrogen molecules would result in no left-over reactants? Explain your answer.

Answer:

t = 37.1 s

Explanation:

The equation for the reaction is given as;

                  2 N2O5(g)  --> 4 NO2 + O2

Initial:          0.110                  -             -

change:        -2x                  +4x        +x

Final:          0.110 - 2x           +4x        +x

But final = 0.150atm;

0.110 - 2x    +  4x   +  x = 0.150 atm

3x = 0.150 - 0.110

x = 0.0133 atm

Pressure in reactant side;

0.110 - 2x

0.110 - 2 (0.0133) = 0.0834 atm

The integral rate law expression is given as;

ln ( [A] / [Ao] ) = -kt

k =  rate constant = 7.48*10^-3*s-1

ln (0.0834/0.11) = (7.48*10^-3)  t

upon solving, t = 37.1 s

In this exercise we have to use the knowledge of chemistry to calculate the necessary time that the pressure can hold the system, in this way we can say that this time corresponds to:

[tex]t = 37.1 s[/tex]

First we have to use the reaction equation given as:

[tex]2 N_2O_5(g) \rightarrow 4 NO_2 + O_2[/tex]

This equation can be rewritten in terms of pressure, so it will be;              

[tex]0.110 - 2X + 4X + X = 0.150 atm\\3X = 0.150 - 0.110\\X = 0.0133 atm[/tex]

Pressure in reactant side, will be:

[tex]0.110 - 2X \rightarrow 0.110 - 2 (0.0133) = 0.0834 atm[/tex]

The integral rate law expression is given as, knowing that the rate constant is  [tex]7.48*10^{-3}*s^{-1}[/tex]

[tex]\int\limits^{0.0834}_{0.11} {(7.48*10^{-3}) t} \, dt = t = 37.1 s[/tex]

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Answer:

Plants need chloroplasts to capture light energy.

Plant cells use light energy to make food.

The cell uses the energy from food.

Hope it helps ;)

Answer:

CH(CH3)2C2H5 or C5H12

Explanation:

Methyl butane or isopentane is an hydrocarbon or an alkane hydrocarbon with the formula C5H12. It has five carbons and twelve hydrogens. It is volatile and highly flammable. It has high boiling point and it can boil away at room temperature on a noon day. It is use as refrigerants. It can easily vanishes to the atmosphere when exposed

Answer:

Explanation:

Answer:

A

Explanation:

Answer:

2.5 moles of KOOH are produced.

Explanation:

1)Given data:

Number of moles of KOOH produced = ?

Number of moles of LiClO = 5 mol

Solution:

Chemical equation:

2LiClO +  KHSO₄     →      Li₂SO₄ + Cl₂ + KOOH

now we will compare the moles of KOOH and LiClO.

                 LiClO          :          KOOH

                    2              :              1

                   5               :             1/2×5 = 2.5

2.5 moles of KOOH are produced.

Answer:

C.) That all matter was composed of earth, fire, water and air

Explanation:

Just took the test

Answer: The partial pressure of Argon , Neon and krypton are 48 kPa , 24 kPa and 8 kPa respectively.

Explanation:

According to Raoult's Law , the partial pressure of each component in the solution is equal to the total pressure multiplied by its mole fraction. It is mathematically expressed as

[tex]p_A=x_A\times P_{total}[/tex]

where, [tex]p_A[/tex] = partial pressure of component A

[tex]x_A[/tex] = mole fraction of A

[tex]P_{total}[/tex] = total pressure

mole fraction of Ar = [tex]\frac{\text {Moles of Ar}}{\text {total moles}}=\frac{60.0}{60.0+30.0+10.0}=0.6[/tex]

[tex]p_{Ar}=0.60\times 80.0kPa=48kPa[/tex]

mole fraction of Ne = [tex]\frac{\text {Moles of Ne}}{\text {total moles}}=\frac{30.0}{60.0+30.0+10.0}=0.30[/tex]

[tex]p_{Ne}=0.30\times 80.0kPa=24kPa[/tex]

mole fraction of Kr = [tex]\frac{\text {Moles of Kr}}{\text {total moles}}=\frac{10.0}{60.0+30.0+10.0}=0.10[/tex]

[tex]p_{Kr}=0.10\times 80.0kPa=8kPa[/tex]

Answer:

Their nuclear symbols are therefore 1H, 2H, and 3H.

Explanation:

Answer:

59.4%

Explanation:

CuSO4(aq) + 2NaOH(aq) -----> Cu(OH)2(aq) + Na2SO4 (aq)

Ratio of molesCuSO4 to NaOH is 1:2

To determine the limiting reagent;

For CuSO4

Number of moles= 638.44g/160 = 4 moles

1 mole of CuSO4 yields 1 mole of Cu(OH)2

4 moles of CuSO4 also yields 4 moles of Cu(OH)2

For NaOH

Number of moles= 240g/40g/mol= 6 moles

2 moles of NaOH yields 1 mole of Cu(OH)2

6 moles of NaOH yields 6× 1/2 = 3 moles of Cu(OH)2

Hence NaOH is the limiting reactant.

Hence mass of Cu(OH)2 = 3 × 98 g/mol

= 294 g

% yield = actual yield/ theoretical yield × 100

% yield= 174.6 /294 × 100/1

% yield = 59.4%

The percent yield is   59.4%

Firstly write the balanced chemical equation:

CuSO₄(aq) + 2NaOH(aq) → Cu(OH)₂(aq) + Na₂SO₄ (aq)

Ratio of moles for CuSO₄ to NaOH is 1:2

To determine the limiting reagent:

For CuSO₄:

[tex]\text{Number of moles}= \frac{ 638.44g}{160}= 4 \text{moles}[/tex]

1 mole of CuSO₄ produces 1 mole of Cu(OH)₂

4 moles of CuSO₄ will produce 4 moles of Cu(OH)₂

For NaOH:

[tex]\text{Number of moles}= \frac{240g}{40g/mol} = 6 \text{moles}[/tex]

2 moles of NaOH yields 1 mole of Cu(OH)₂

6 moles of NaOH yields [tex]6*\frac{1}{2} = 3[/tex] moles of Cu(OH)₂

Hence, NaOH is the limiting reactant.

Therefore, mass of Cu(OH)₂ = [tex]3 * 98 g/mol= 294 g[/tex]

% yield = actual yield/ theoretical yield × 100

% yield= [tex]\frac{174.6}{294}* 100[/tex]

% yield = 59.4%

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Answer:

Burning gasoline in a lawnmower is a chemical change.

Explanation:

Here, a combustion reaction takes place. Freezing water to make ice cubes, melting gold to make jewellery and boiling water for soup are examples of physical change since, only a change in physical state takes place.

Answer:

d = 43.5 g/cm³

Explanation:

Given data:

Mass of magnesium cube = 217.501 g

Volume of magnesium cube = 5.00 cm³

Density of magnesium cube = ?

Solution:

Formula:

d = m/v

d = density

m = mass

v = volume

by putting values,

d = 217.501 g/ 5.00 cm³

d = 43.5 g/cm³

Answer:

No, a mole of oxygen is about 16 grams

Explanation:

Answer:

Sum of their partial pressures

Explanation:

If two gases are present in a container, the total pressure in the container is equal to the sum of their partial pressures.

This solution is based on the Dalton's Law of Partial Pressures.

Dalton's Law of Partial Pressure states that "the total pressure of a mixture of gases is equal to the sum of the partial pressures of the constituent gases".

A partial pressure is the pressure a gas would exert if it alone occupied the volume of the gas mixture.

Answer:

c

Explanation:

got it right on test

Oxygen will appear in the final equation as O2 reactant.

A chemical equations shows the interplay between reactants and products. The reactants are on the left hand side while the products are at the right  hand side.

Looking at the two equations, we know that oxygen will appear in the final equation as O2 reactant.

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Answer:

See explanation

Explanation:

In an atom, the inner electrons may shield the outer electrons from the attractive force of the nucleus. We, refer to this phenomenon as the shielding effect, It is defined as a decrease in the magnitude of attraction between an electron and the nucleus of an atom having more than one electron shell (energy level).

Shielding effect increases down the group due to addition of more shells but decreases across the period due to the increase in the size of the nuclear charge.

As the magnitude of shielding increases down the group, ionization of electrons becomes easier and the first ionization energies of elements decreases as we move down the group. Since shielding effect decreases across the period, the first ionization energies of elements increases across the period.

Answer:

2CH₃OH + 3O₂ → 2CO₂ + 4H₂O

Explanation:

A complete reaction for when any organic compound burns in air, produces only water and carbon dioxide. It does so by reacting with the oxygen gas (O₂) present in air.

In the case of methanol (CH₃OH) combustion, the balanced reaction is:

2CH₃OH + 3O₂ → 2CO₂ + 4H₂O

Answer:

Explanation:

HCl    ⇄    H⁺    +   Cl⁻

HCl is a strong electrolyte so it will ionize completely .

moles of Cl⁻ in 100 mL of .1 HCl = .1 x .1 = .01 gram - ion .

CaCl₂ = Ca⁺² + 2 Cl⁻

1 mole                2 mole

moles of CaCl₂ in 200 mL of .1 M CaCl₂ = .2 x .1 = .02 gram mole  .

.02 gram mole of CaCl₂ will give 2 x .02 = .04 gram-ion of Cl⁻ ion .

Total gram - ion of Cl⁻ = .01 + .04 = .05 gram-ion .

Total volume = 300mL = .3 L

molarity of Cl⁻ = .05 / .3 = .167 M .

HCl    ⇄    H⁺    +   Cl⁻

moles of H⁺ = moles of Cl⁻ = .01 gram-ion .

volume of solution = .3 L

molarity of H⁺ = .01 / .3 = 33.33 x 10⁻³ M .

[ H⁺] [ OH⁻] = 10⁻¹⁴

33.33 x 10⁻³  [ OH⁻] = 10⁻¹⁴

[ OH⁻] = 3 x 10⁻¹³

pOH = - log[OH⁻] = - log3 x 10⁻¹³

13-log3

= 13 - .477

12.52

or ,

pH = - log[H⁺] = - log33.33 x 10⁻³

3 - log 33.33

= 3 - 1.52

= 1.48

pOH = 14 - 1.48 = 12.52

Answer:

66.5753 amu

Explanation:

From the question given above, the following data were obtained:

Isotope A (⁶⁵X):

Mass of A = 65.0457 amu

Abundance of A = 20.53%

Isotope B (⁶⁷X):

Mass of B = 66.9704 amu

Abundance of B = 79.47%

Atomic mass of X =?

The atomic mass of X can be obtained as follow:

Atomic mass = [(mass of A × A%)/100] + [(mass of B × B%)/100]

= [(65.0457 × 20.53)/100] + [(66.9704 × 79.47)/100]

= 13.3539 + 53.2214

= 66.5753 amu

Therefore, the atomic mass of X is 66.5753 amu.

Element X, with an atomic mass of 66.58 amu, has 2 naturally occurring isotopes, ⁶⁵X (65.0457 amu, 20.53%) and ⁶⁷X (66.9704 amu,  79.47%).

The average atomic mass (atomic mass) of an element is the sum of the masses of its isotopes, each multiplied by its natural abundance.

Element X has 2 isotopes:

We can calculate the average atomic mass of X using the following expression.

mX = m⁶⁵X × ab⁶⁵X + m⁶⁷X × ab⁶⁷X

mX = 65.0457 amu × 0.2053 + 66.9704 amu × 0.7947

mX = 66.58 amu

Element X, with an atomic mass of 66.58 amu, has 2 naturally occurring isotopes, ⁶⁵X (65.0457 amu, 20.53%) and ⁶⁷X (66.9704 amu,  79.47%).

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Answer:

Neptunium, Protactinium, plutonium and more

Explanation:

Answer:

0.069 M

Explanation:

Equation of the reaction:

H₂SO₄(aq) + 2NaOH(aq) ⇒ Na₂SO₄(aq)+2H₂O(l)

From the equation above, 2 mole of NaOH is required to  reach equivalent point with 1 mole of H₂SO₄.

n'CV = nC'V' ........................ Equation 1

Where n and n' = are number of moles of acid and base respectively, C and C' = are molarities of acid and base respectively, V and V' are volumes of acid and base respectively.

make C the subject of the equation

C = nC'V'/n'V.............................. Equation 2

Given: n = 1, n' = 2, C' = 0.11 M, V = 25 mL, V' = 31.43 mL

Substitute into equation 2

C = (1×0.11×31.43)/(25×2)

C = 0.069 M.

Hence the molarity of H₂SO₄ is 0.069 M

Answer:

I think its b or c

Explanation:

hope this helps I mainly think b

Answer:

ionic solids

Explanation:

Ionic solids are a regular pattern of cations and anions that arrange themselves into a continuous solid network.

NaCl is composed of sodium ions and chloride ions that are held together by Coulumbic attractive forces to form a large crystal structure.

Such ionic solids have a very high melting point and do not conduct electricity in the sold state. However, the molten substance or a solution of the substance conducts electricity.

Answer:

0.0032mm

Explanation:

Given dimension:

Measurement  = 3.2 x 10⁻³mm

Unknown:

Write in standard notation from scientific notation = ?

Solution:

The standard notation is the way we normally write.

   For example;   standard notation of 1 million is 1000000

Now;

        3.2 x 10⁻³  =   [tex]\frac{3.2}{1000}[/tex]    = 0.0032mm

3.2x10⁻³ mm in standard notation is 0.0032 mm. The normal or generally accepted manner of representing or expressing anything is referred to as standard notation.

Standard notation refers to the conventional or widely accepted way of representing or expressing something. In mathematics, for example, standard notation refers to the commonly used symbols and formats for writing mathematical expressions, equations, or numbers. The use of standard notation ensures uniformity, ease of understanding, and communication among mathematicians and students. Powers of 10 are used in scientific notation to express extremely large or extremely small quantities. 3.2x10⁻³ mm in standard notation is 0.0032 mm.

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Answer:

See explanation

Explanation:

a)  The average kinetic energy of the molecules of a gas depends on the temperature and the molar mass of the gas. However, at the same temperature, all gases have the same average kinetic energy. Hence Xe and Ne atoms have the same average kinetic energy.

b) To decrease the kinetic energy of Xe atoms the temperature must be changed. When the temperature is changed, Xe a lower average kinetic energy due to its larger molar mass.

c) All gases occupying the same volume have equal number of particles at the same temperature and pressure according to Avogadro's law. Therefore, since Xe and Ne occupy the same volume at the same temperature but different pressures they do not contain the same number of particles. Xe gas contains more particles because there are more moles of Xe gas present than moles of Ne gas. The greater the number of moles of gas present, the more the number of gas particles present.

Aluminum and Sulfur react to produce Aluminum sulfide(Al₂S₃)

Given

The reaction of Aluminium and Sulfur

Required

The products of the reaction

Solution

There are several types of reactions that can occur

Synthesis/combination reaction : 2 elements combine to form a single product

The general formula :

A + B ⇒ AB

For reaction above :

2Al + 3S ⇒ Al₂S₃

Answer:

0.091

Explanation:

just took test on edg

Answer:

0.091

Explanation:

correct on edge 2021 unit test

Answer:

that the poem needs to be finished heh pog

Explanation:

Answer:

Where is the poem?

Explanation:

To determine which object has the least volume, we can calculate the volume of each object using the formula of density. From this, Object C has the smallest volume of 20 cm³ among Objects A, B, and C.

The formulae of volume:

Volume = Mass / Density

Let's calculate the volumes of objects A, B, and C:

For Object A:

Density = 2.0 g/cm³

Mass = 100 g

Volume of A = Mass / Density

Volume of A = 100 g / 2.0 g/cm³

Volume of A = 50 cm³

For Object B:

Density = 0.8 g/cm³

Mass = 240 g

Volume of B = Mass / Density

Volume of B = 240 g / 0.8 g/cm³

Volume of B = 300 cm³

For Object C:

Density = 5.0 g/cm³

Mass = 100 g

Volume of C = Mass / Density

Volume of C = 100 g / 5.0 g/cm³

Volume of C= 20 cm³

Comparing the volumes, we find that Object C has the least volume, with 20 cm³.

Therefore, Object C has the smallest volume among Objects A, B, and C.

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