What is the pressure of a 0.108 mol sample of helium gas at a temperature of 293 K if its volume is 0.505 L?

Answer:

[tex]819 \: g = 819 \times {10}^{ - 3} \: kg = 0.819 \: kg \\ 0.819 \: kg - 0.497 \: kg \\ = 0.322 \: kg[/tex]

Answer:

Ca - 66%, P - 34%

Explanation:

So, this is the formula we can use to find the amount of each element:

Element count * Atomic mass = Mass

Plug in our elements for this:

Ca - 3*40.078=120.234

P - 2*30.973=61.946

Now, to find the percentage of mass, we must find total mass, and divide the two elements mass count by this total mass:

120.234+61.946=182.18

Now divide each element mass by the total mass:

Ca - 120.234/182.18=0.6599(Round to 0.65)

P - 61.946/182.18=0.34002(Round to 0.34)

Then multiply both numbers by 100 to get the percentage:

Ca - 65%

P - 34%

So these our your two answer!

Hope this helps!

Answer:

The boiling point of Kelvin scale is: 373° k

hope it is helpful to you

Answer: First box----Hail

             Second Box-------Snow

             Thrid Box-------Sleet

              Forth Box-----Rain

Hope that helped! :)

Answer:

1935100 Bq

Explanation:

Let us recall that:

If 1 μCi can be equivalent to 37000 Bq

Then; the activity of 52.3 μCi will be:

[tex]\dfrac{37000 \ Bq}{1 \ \mu Ci}\times 52.3 \ \mu Ci \\ \\ \\ \\ \mathbf{= 1935100 \ Bq}[/tex]

Answer:

The thermal efficiency of an engine is [tex]0.15[/tex] that is 15%

Explanation:

Specific heat of a gas at constant volume is

[tex]C_{v}=\frac{fR}{2}[/tex]

here, [tex]f=[/tex]degree of freedom

[tex]R=[/tex]universal gas constant

Thermal efficiency of a cycle is

[tex]\frac{total workdone}{gross heat absorbed}[/tex]

Gross heat absorbed is amount of heat that absorbed.

ω[tex]=P_{o} V_{o}[/tex]

[tex]Q_{AB}=[/tex]Δ[tex]V_{AB}+[/tex]ω[tex]_{AB}[/tex][tex]=nC_{v}(T_{f}-T_{i} )[/tex]

       [tex]=n\frac{f}{2}(RT_{f}-RT_{i} )[/tex][tex]=\frac{f}{2}(P_{o}V_{o} )[/tex]

[tex]Q_{BC}=n(\frac{f}{2}+1 )R(T_{f}-T_{i} )[/tex]

       [tex]=(\frac{f}{2} +1)(4P_{o}V_{o}-2P_{o}V_{o} )[/tex]=[tex]=(\frac{f}{2}+1)2P_{o}V_{o}[/tex]

[tex]Q_{CD}=-ve and Q_{DA}=-ve[/tex]    these 2 are not the part of gross heat

η[tex]=\frac{P_{o}V_{o} }{(\frac{3f}{2}+2 )(P_{o}V_{o})}[/tex]

  [tex]=\frac{1}{(\frac{3f}{2}+2 )}[/tex]

For monoatomic gas [tex]f=3[/tex]

η[tex]=\frac{2}{13}[/tex]

  [tex]=0.15[/tex]

It would shift to the right, favor the forward reaction and the rate of reaction would increase.

(third option)

Answer:

Work done on the system is zero , hence no work is done since the process is isochoric. There is no work done if the volume remains unchanged. (Though the temperature rises, work is only accomplished when the volume of the gas changes.)

Explanation:

ISOCHORIC PROCESS - An isochoric process, also known as a constant-volume process, isovolumetric process, or isometric process, is a thermodynamic process in which the volume of the closed system undergoing the process remains constant through the process. The heating or cooling of the contents of a sealed, inelastic container is an example of an isochoric process. The thermodynamic process is the addition or removal of heat, the closed system is established by the isolation of the contents of the container, and the constant-volume condition is imposed by the container's inability to deform. It should be a quasi-static isochoric process in this case.

Hence , the work done in the system is zero.

Answer: Volume is 0.466 ml.  Maybe in this case it is safer to round downward.

Explanation:  V =  14.0 mg / 30 mg/mL  = 0.466.. ml

2.1  milliliters will the nurse draw up in the syringe if the bottle is labeled 30. mg/mL and the order is a dose of 14.0 mg of an injection of promethazine an antihistamine.

This is a combination of medications used to treat the temporary symptoms of the common cold and for allergies related to breathing and mostly deals with breathing problems of the one.

Injection used has a fixed dose which varies according to age group for  30. mg/mL and the order is a dose of 14.0 mg can be calculated by,

                       14/30 ×100 = 2.1  milliliters

Therefore, the nurse draws up the syringe if the bottle is labeled 30. mg/mL and the order is a dose of 14.0 mg of an injection of promethazine an antihistamine it will be 2.1  milliliters.

Learn more about antihistamines, here:

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The change in free energy can help us to discover whether a reaction can be sponteanous or not. The change in free energy fro this reaction is -1.51 kJ/mol.

The change in free energy is referred to as that which determines the spontenity of a chemical reaction. For a spontenous reaction the change in free energy must be negative.

Now;

ΔG = -RTlnK

R = gas constant

T = temperature

K = equilibrium constant

So;

ΔG = -(8.314 * 298 * ln 436)

ΔG = -1.51 kJ/mol

Learn more about free energy: https://brainly.com/question/15319033

Answer:

C

Explanation:

Answer:

the crust would be your answer

Explanation:

Answer: D

Explanation:

liquid evaporates faster at higher temperatures because more particles have a higher speed and can overcome attractions in the liquid.

Answer:

D. A liquid evaporates faster at higher temperatures because more particles have a higher speed and can overcome attractions in the liquid.

Explanation:

Correct on Edge 2022!!!

Good luck everyone, you got this! Have a great day!

Answer:

42.64 L

Explanation:

Using the combined law equation as follows:

P1V1/T1 = P2V2/T2

Where;

P1 = initial pressure (mmHg)

P2 = final pressure (mmHg)

V1 = initial volume (L)

V2 = final volume (L)

T1 = initial temperature (K)

T2 = final temperature (K)

According to the information in this question,

P1 = 748mmHg

P2 = 400mmHg

V1 = 26.7 L

V2 = ?

T1 = 28.4 °C = 28.4 + 273 = 301.4K

T2 = -15.6 °C = -15.6 + 273 = 257.4K

Using P1V1/T1 = P2V2/T2

748 × 26.7/301.4 = 400 × V2/257.4

66.26= 1.554 V2

V2 = 66.26 ÷ 1.554

V2 = 42.64 L

Three solutions are mixed together to form a single solution. The precipitate in the solution is PbS and PbCl₂.

Precipitates are the residues that are present in the solution. These residues are solid that came out of the solution.

Here given 3 compounds are water-soluble.

From the solution, we have to find the possible combination which is water-soluble.

Consider,

Pb(CH3COO)₂ Pb₂+(aq) + 2CH₃COO-(aq)

Na₂S₂Na+(aq) + S₂-(aq)

LiCl Li+(aq) + Cl-(aq)

Now consider a potential accumulation of positive and negative ions which is water-soluble.

The possible accumulations are,

PbS , PbCl₂

Ca(CH₃COO)₂ , CaS

Now viewing with solubility charge, we can find that both PbS and PbCl2 are water indissoluble and create a precipitate.

But both Ca(CH₃COO)₂ and CaS are water-soluble.

Therefore, the precipitates are PbS and PbCl₂.

To learn more about precipitates, refer to the link:

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Answer:

I'd say the plastic particles in the bowl boiled off into the water to make the water cloudy and taste different. While the water boiled in the pot was clearer and tasted no different than regular water

Explanation:

I'm doing the course activity now.

A. reaction A: chemical; reaction B: nuclear

Answer:

Solution given:

as

Circle 2: Reaction B

-Involves neutrons

-Happens inside atomic nucleus

-Releases relatively large amounts of energy

It happens on normal chemical reaction.

Circle 2: Reaction B

-Involves neutrons

-Happens inside atomic nucleus

-Releases relatively large amounts of energy

It happens on nuclear reaction.

Answer:

A   reaction A: chemical; reaction B: nuclear

Explanation:

edg 2021

Answer:

Your answer is C

Explanation:

When an acid and base react, the acidic hydrogen ion and the basic hydroxide ion in each acid and base neutralize each other and form water. Meanwhile the conjugate base and conjugate acid (the leftover compounds) react to form an ionic molecule, or a salt. (In chemistry, when an anion and a cation form an ionic bond the new molecule is called a salt). Hope this helps!

Complete Question

Use the fact that [tex]d\mu=\frac{V}{N}dp-\frac{s}{N}dT[/tex] to determine how much the pressure must change in order to lower the boiling point of water by a small amount 3.20e-01 K. You may assume that the entropy and density of the liquid and gas are roughly constant for these small changes. You may also assume that the volume per molecule of liquid water is approximately zero compared to that of water vapor, and that water vapor is an ideal gas. Useful constants: Atmospheric pressure is 101300 Pa The boiling point of water at atmospheric pressure is 373.15 K The entropy difference between liquid and gas per kilogram is 6.05e 03 J/kgK The molecular weight of water is 0.018 kg/mol. (a) 0.00e 00 Pa (b) 1.14e 03 Pa (c) 6.85e 26 Pa (d) 4.24e 05 Pa (e) 3.81e 28 Pa

Answer:

Correct option is B

Explanation:

From the question we are told that:

Given Equation [tex]d\mu=\frac{V}{N}dp-\frac{s}{N}dT[/tex]

Change of boiling point \triangle [tex]H=3.20e-01 K[/tex]

Generally the equation for Change in time is mathematically given by

  [tex]d\mu=\frac{V}{N}dp-\frac{s}{N}dT[/tex]

  [tex]dp=\frac{s}{v}dT[/tex]

Where

    [tex]s=Entropy\ difference *molar\ weight[/tex]

    [tex]s=6.05*10^3*0.018j/mol.k[/tex]

And

    [tex]V=\frac{RT}{P}[/tex] (from ideal gas equation)

Therefore

 [tex]dp=\frac{Ps}{RT}dT[/tex]

 [tex]dp=\frac{101300*6.05*10^3*0.018}{8.314*373.15}3.20*10^{-1}[/tex]

 [tex]dp=1137.873pa[/tex]

 [tex]dp=1.14e 03 Pa[/tex]

Therefore correct option is B

Answer:

B.The latent heat of vaporization

Explanation:

latent heat, also called the heat of vaporization, is the amount of energy necessary to change a liquid to a vapour at constant temperature and pressure.

Answer:

The question is not complete as it lacks the options. The options are;

A) i,ii, and iii

B) i and ii

C) i,iii,and iv

D) i,ii,iii, and iv

E) iii and iv

The answer is A.

Explanation:

A redox reaction i.e. oxidation-reduction is a reaction in which a change in the oxidation number or state of the participating atoms occur. A redox reaction, as the name implies, contains the oxidation part and the reduction part.

Just like any other reaction, redox reaction needs to be balanced as well. A balanced redox reaction must have the following characteristics:

- The same number of each type of atom on both sides of the equation. For example, if there are 4 atoms of Carbon on the reactant side, there must be 4 atoms of C on product side.

- The total number electrons lost in the oxidation equal to total number of electrons gained in the reduction. For example, if 12 electrons are gained in the reduction part, 12 electrons must be lost in the oxidation part.

- The same total charge of all ionic species on both sides of the reaction.

Answer:

cryptic biodiversity

Explanation:

Answer:

false im pretty sure.

Solution :

Given :

Initial temperature of the refrigerant is :

[tex]$T_i=39.37 ^ \circ C$[/tex]

   = ( 39.37 + 273 ) K

  = 312.3 K

Room which is maintained at constant temperature is :

[tex]$T_o=22 ^ \circ C$[/tex]

    = (22+273) K

    = 295 K

The thermal energy transferred to the room is :

Q = 400 kJ

   = [tex]$400 \times 10^3 \ J$[/tex]

Therefore, the total entropy generation during the thermal energy process is :

[tex]$\Delta S =\left[\frac{-Q}{T_i}+ \frac{+Q}{T_i}\right]$[/tex]

Here, -Q = heat is leaving the system maintained at a temperature of [tex]$T_i$[/tex] K.

 +Q = heat is entering the system maintained at a temperature of [tex]$T_o$[/tex] K.    

Therefore, substituting the values :

[tex]$\Delta S =\left[\frac{-400\times 10^3}{312.3}+ \frac{400\times 10^3}{295}\right]$[/tex]

      = [-1280.8197 + 1355.9322]

      = 75.1125 J/K

       = 0.0751125 kJ/K

      = 0.075 kJ/K

Answer: So, If we mix 40.0 g of NaOH with enough distilled water to make 500 mL, we will get a 2.00 M NaOH solution.

Explanation: how do you show pictures like how you did??

Answer:

Our bodies convert chemical energy in our food into mechanical energy for us to move.

An electric fan transforms electrical energy into kinetic energy

Reword it tho

Hope this helps!!

Answer:

0.921 moles

Explanation:

1.91 M means 1.91 moles/liter

482 mL = 0.482 L

0.482 L × 1.91 moles/liter = 0.92062 moles

Answer:

Potassium iodide

Explanation:

The white solid introduced into the solution is potassium bromide. This is an ionic solid thus it quickly dissolves in water to yield a colorless solution.

When chlorine is added to this solution, the iodine is displaced since chlorine is above iodine in the electrochemical series.

When mixed with hexane, the color of the solution changes to purple.

Answer:

None of these

Explanation:

For a reaction;

aA + bB ------>cC + dD

The equilibrium constant K is given as;

K = [C]^c [D]^d/[A]^a [B]^b

The equilibrium constant neither depends on the concentrations of the reactants nor on that of the products.

Let us recall that at equilibrium, the concentrations of reactants and products remain largely constant. This implies that, concentration of species do not appreciably change at equilibrium because the rates of forward and reverse reactions are equal.

Hence, the equilibrium constant neither depends on the initial/final concentrations of the reactants nor on the initial/final concentrations of the products.