PLS HELP ASAP THIS IS DUE IN 10 MINUTES I NEED NUMBER 3, 4 AND 5!

Answer:

Mole fraction H2: 0.625

Mole fraction O2: 0.375

Molecular weight: 13.25g/mol

Mass fraction H2: 0.094

Mass fraction O2: 0.906

Explanation:

Moles fraction is defined as the ratio between moles of a substance and total moles presents in a mixture:

Mole fraction H2 = 5kmol / (5kmol + 3kmol) = 0.625

Mole fraction O2 = 3kmol / (5kmol + 3kmol) = 0.375

Molecular weight is defined as the mass per mole of substance:

Mass H2 = 5kmol * (2kg / kmol) = 10kg

Mass O2 = 3kmol * (32kg / kmol) = 96kg

Molecular weight:

106kg / 8kmol = 13.25g/mol

In the same way, mass fraction is the ratio between mass of a substance and total mass of the mixture:

Mass fraction H2 = 10kg / (10kg + 96kg) = 0.094

Mass fraction O2 = 96kg / (10kg + 96kg) = 0.906

Answer:

Convergent boundaries

Explanation:

Answer:

[tex]MM_{C_5S_2}=132.19g/mol[/tex]

Explanation:

Hello!

In this case, since the computation of the molar mass requires the molecular formula, we first realize that of pentacarbon disulfide is C₅S₂ due to the given prefixes. In such a way, we multiply the atomic mass of carbon by five and that of sulfur by two as shown below:

[tex]MM_{C_5S_2}=5m_C+2m_S[/tex]

Thus, we plug in the atomic masses given in the periodic table to obtain:

[tex]MM_{C_5S_2}=5*12.01+2*32.07\\\\MM_{C_5S_2}=132.19g/mol[/tex]

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Answer:1-1 equakls

Explanation:

Answer:

B

Explanation:

Step 1 occurs at a slower rate than Step 2.

The fraction of molecules with enough energy to overcome the activation energy barrier is lower for HI and ICl than for H2, and ICI.

We must bear in mind that the rate determining step in a reaction is the slowest step in the chemical reaction. As such, we can clearly see that step 1 is the rate determining step in the reaction.

The fast reaction must have a minimum energy barrier between the reactants and the products. Hence, the fraction of molecules with enough energy to overcome the activation energy barrier is lower for HI and ICl than for H2, and ICI.

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Answer:

Mass = 22.1 g

Explanation:

Given data:

Mass of nitrogen = 25.0 g

Mass of hydrogen = 4.02 g

Mass of ammonia formed = ?

Solution:

Chemical equation:

N₂ + 3H₂     →     2NH₃

Number of moles of nitrogen:

Number of moles = mass/molar mass

Number of moles = 25.0 g/ 28 g/mol

Number of moles = 0.89 mol

Number of moles of nitrogen:

Number of moles = mass/molar mass

Number of moles = 4.02 g/ 2 g/mol

Number of moles =2.01 mol

now we will compare the moles of nitrogen and hydrogen with ammonia.

                H₂         :       NH₃

                  3          :         2

                  2.01     :        2/3×2.01 = 1.3 mol

                 N₂         :       NH₃

                   1          :         2

                 0.89     :        2/1×0.89 = 1.78 mol

hydrogen produced less number of moles of ammonia it will act ae limiting reactant.

Mass of ammonia:

Mass = number of moles × molar mass

Mass = 1.3 mol × 17 g/mol

Mass = 22.1 g

Explanation:

0.20 equal to 2/65

2/65-0.20

-0.1692

Answer:

i like one direction

Explanation:

Answer: the answer is c

Explanation: hope this helps you

Answer: the answer is c

Explanation: hope this helps you

Answer:

22s

Explanation:

Given parameters:

Acceleration  = 25m/s²

Final velocity = 550m/s

Initial velocity  = 0m/s

Unknown:

Time taken  = ?

Solution:

To solve this problem, we are going to use one of the motion equations:

                 v  = u + at

v is the final velocity

u is the initial velocity

a is the acceleration

t is the time taken

                  550 = 0 + 25 x t

                  550  = 25t

                    t  = 22s

The molecular formula : As₄S₆

Given

Rate of effusion of arsenic(III) sulfide = 0.28 times the rate of effusion of Ar atoms

Required

The molecular formula

Solution

Graham's law: the rate of effusion of a gas is inversely proportional to the square root of its molar masses or  

the effusion rates of two gases = the square root of the inverse of their molar masses:  

[tex]\rm \dfrac{r_1}{r_2}=\sqrt{\dfrac{M_2}{M_1} }[/tex]

or  

[tex]\rm M_1\times r_1^2=M_2\times r_2^2[/tex]

Input the value :

1 = Arsenic(III) sulfide

2 = Ar

MM Ar = 40 g/mol

0.28 = √(40/M₁)

M₁=40 : 0.28²

M₁=510 g/mol

The empirical formula of arsenic(III) sulfide =  As₂S₃

(Empirical formula)n = molecular formula

( As₂S₃)n = 510 g/mol

(246.02 g/mol)n = 510 g/mol

n = 2

So the molecular formula : As₄S₆

Answer:

Double-Replacement Reactions

Explanation:

KOH + HNO3 -> H2O + KNO3

This is a double replacement reaction

The anions are "traded" and two new compounds are produced

(a liquid and a salt)

Answer:

You can heat it and then let it cool it in a very strong magnetic field.

It can be heated and then allowed to cool in a very powerful magnetic field. To make an item that is made of magnetic material become a permanent magnet instead of a temporary magnet.

The magnetic influence on moving electric charges, electric currents, and magnetic materials is described by a magnetic field, which is a vector field. A force perpendicular to the charge's own velocity and the magnetic field acts on it when the charge is travelling through a magnetic field.

Heating a ferromagnetic material to a crucially high temperature is the primary method for producing permanent magnets. Although the temperature varies depending on the type of metal, it has the effect of aligning and "fixing" the magnet's domains in place over time.

Electric charges in motion are what generate magnetism. The smallest building blocks of matter are called atoms. Each atom contains electrons, which are tiny particles with electric charges.

Thus, It can be heated and then allowed to cool in a very powerful magnetic field.

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Answer:

energy level

sub energy level

electrons in the orbital

Explanation:

Answer: True

Explanation: Frequency by definition is the number of waves that pass a fixed point given a certain amount of time. The shorter the wavelength, the higher the frequency.

Frequency is the number of wavelengths that pass by a point each second. Therefore, the given statement is true.

In physics, frequency is the amount of waves that pass a given point in a unit of time as well as the amount of cycles or vibrations that a body in periodic motion experiences in a unit of time. After moving through a sequence of situations or locations and then returning to its initial position, a body in periodic motion is thought to have experienced one cycle or one vibration.

The frequency is 2 per second if the period, as well as time interval, needed to complete 1 cycle or vibration is 1/2 second; it is 100 per hour if the duration is 1/100 of an hour. In most cases, the frequency is equal to the period, or time interval, reciprocally, therefore frequency = 1/period = 1. (time interval). Frequency is the number of wavelengths that pass by a point each second

Therefore, the given statement is true.

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1 kilogram = 1000 grams

0.29 kg = 290 grams.

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A jar contains 0.29 kg of olives. The quantity of olives in the jar is 290 grams.

A conversion factor may be significantly defined as a process through which a number is utilized in order to change one or specific set of units to another with the help of mathematical operations like multiplication and division.

According to the question,

The number of olives in the jar = 0.29 kg.

Now, if you want to convert this set of units into grams, you must require simple calculations:

1 kilogram = 1000 grams.

0.29 kilograms = 0.29 × 1000 = 290 grams.

Therefore, a jar contains 0.29 kg of olives. The quantity of olives in the jar is 290 grams.

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Answer:

Explanation:

From the information given, we are to show the product of the reaction between the alcohol (stick formula) with pyridinium chlorochromate. The reaction starts with the nucleophilic addition of Cr with oxygen molecule on the alcohol. Then, deprotonation of oxygen occurs, this process is followed by the removal of hydrogen ion to yield the final product. The reaction mechanism can be seen from the attached image below.

Answer:

1.041g is the maximum sigle dose for the person

Explanation:

The maximum dose for acetaminophen is 15.0mg / kg of body weight for adults

To find the maximum single dosage for a person who weighs 153lb we must convert the lb to kg (1lb = 0.4536kg):

153lb * (0.4536kg / 1lb) = 69.4kg is the mass of the person

As the maximum dose is 15.0mg / kg, the dose of the person is:

69.4kg * (15.0mg acetaminophen / kg) =

Answer:

8239.2g

Explanation:

Given parameters:

Number of atoms in Br  = 6.2 x 10²⁵atoms

Unknown:

Mass of Br = ?

Solution:

From mole concepts, we know that:

       1 mole of a substance contains 6.02 x 10²³ atoms/mol

 Molar mass of Br  = 80g/mol

6.2 x 10²⁵atoms  x [tex]\frac{1}{6.02 x 10^{23} }[/tex] [tex]\frac{mol}{atoms}[/tex] x  80 x [tex]\frac{g}{moles}[/tex]  

          = 8239.2g

Answer:

61.4 %

Explanation:

Let's consider a generic chemical reaction.

Reactants ⇒ Products

The theoretical yield is the maximum mass of product that theoretically can be obtained from the chemical reaction.

The actual yield is the mass of the product obtained from the reaction.

The percent yield is:

Percent yield = actual yield / theoretical yield × 100%

Percent yield = 60.9 g / 99.2 g × 100% = 61.4 %

Answer: Potential energy

Explanation:

Answer: Examples:: Rubbing Alcohol, Dissolved Sugar in Water

Explanation:

A solution is a homogeneous mixture made up of two or more substances.

Electrons were held even outside the nucleus, unlike protons as well as neutrons.

Subatomic particles with an elementary charge of -1 were classified as electrons.

An atom's nucleus would be its center. The protons, as well as neutrons in the nucleus, as well as neutrons in the nucleus, make up several of an atom's mass while orbiting electrons contribute only a little amount.

Electrons were held even outside the nucleus, unlike protons as well as neutrons, which have been contained within the nucleus at the heart of the atom. Negative electrons were drawn to the positive nucleus by the attraction of opposite electric charges.

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Answer:

The final volume when pressure is changed is 126.1mL

Explanation:

Based on Boyle's law, in a gas the volume is inversely proportional to its pressure when temperature remains constant. The equation is:

P₁V₁ = P₂V₂

Where P is pressure and V volume of 1, intial state and 2, final state.

Computing the values of the problem:

350mmHg*200mL = 555mmHgV₂

126.1mmHg = V₂

Answer:

[tex]84.94\ \text{mL}[/tex]

Explanation:

[tex]m[/tex] = Mass of ethyl alcohol = [tex]67.1\ \text{g}[/tex]

[tex]\rho[/tex] = Density of ethyl alcohol = [tex]0.79\ \text{g/mL}[/tex]

[tex]V[/tex] = Volume of ethyl alcohol

Density is given by

[tex]\rho=\dfrac{m}{V}\\\Rightarrow V=\dfrac{m}{\rho}\\\Rightarrow V=\dfrac{67.1}{0.79}\\\Rightarrow V=84.94\ \text{mL}[/tex]

The volume of ethyl alcohol is [tex]84.94\ \text{mL}[/tex].

Answer:

[tex]x_{suc}=0.00406[/tex]

Explanation:

Hello!

In this case, since the mole fraction relates the moles of solute and the moles of solution, and for sucrose it is:

[tex]x_{suc}=\frac{n_{suc}}{n_{suc}+n_{water}}[/tex]

Whereas we need to compute the moles of both sucrose and water based on their molar masses (342.3 and 18.02 respectively) as shown below:

[tex]n_{suc}}=\frac{38.6g}{342.3g/mol}=0.113mol\\\\ n_{water}}=\frac{495g}{18.02g/mol}=27.5mol\\[/tex]

Thus, the mole fraction sucrose turns out:

[tex]x_{suc}=\frac{0.112}{0.112+27.5}\\\\x_{suc}=0.00406[/tex]

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