All categories

2 years ago

Calculate the number of moles of an ideal gas if it occupies 1750 dm3 under 125,000 Pa at a temperature of 127 C.

Chemistry

2 answers:

Margarita [4]2 years ago

7 0

<h2>Hello!</h2>

The answer is:

The number of moles (n) is 65.55 mol.

$n=65.55mol$

To solve the problem, we need to use the ideal gas law.

The Ideal Gas Equation is given by the following expression:

$PV=nRT$

Where,

P, is the pressure in atm

V, is the volume in liters (L)

n, is the number of moles

R, is the Ideal Gas Constant

T, is the temperature in Kelvin (K)

We are given the information:

$P=12500Pa\\V=1750dm^{3}\\T=127\°C$

We need to convert the given units in order to use the Ideal Gas Equation, so, converting we have:

Pressure:

We know that:

$1atm=101325Pa$

So, converting we have

$125000Pa*\frac{1atm}{101325Pa}=1.23atm$

Volume:

We know that:

$1L=1dm^{3}$

So, we have:

$1750dm^{3}=1750L$

Temperature:

We know that to convert from celsius degrees to Kelvin, we need to perform the following operation:

$T(K)=T(\°C)+273.15$

So, converting we have:

$T(K)=127+273.15=400.15$

Also, we have that

$R=0.08205746\frac{atm.L}{mol.K}$

Now, substituting the given information into the equation to isolate "n", we have:

$PV=nRT\\\\1.23atm*1750L=n*0.08205746\frac{atm.L}{mol.K}*400.15K\\\\2152.5atm.L=n*32.84\frac{atm.L}{mol}\\\\n=\frac{2152.5atm.L}{32.84atm.L}mol\\\\n=65.55mol$

Hence, we have that the number of moles (n) is 65.55 mol.

Have a nice day!

Vesnalui [34]2 years ago

6 0

Answer:

65.81

Explanation:

Educere/ Founder's Education

You might be interested in

Zinc is to be electroplated onto both sides of an iron sheet that is 20 cm2 as a galvanized sacrificial anode. It is desired to

Alexandra [31]

Answer:

The time required for the coating is 105 s

Explanation:

Zinc undergoes reduction reaction and absorbs two (2) electron ions.

The expression for the mass change at electrode $(m_{ch})$ is given as :

$\frac{m_{ch}}{M} ZF = It$

where;

M = molar mass

Z = ions charge at electrodes

F = Faraday's constant

I = current

A = area

t = time

also; $(m_{ch})$ = $(Ad) \rho$ ; replacing that into above equation; we have:

$\frac{(Ad) \rho}{M} ZF = It$ ---- equation (1)

where;

A = area

d = thickness

$\rho$ = density

From the above equation (1); The time required for coating can be calculated as;

$[ \frac{20 cm^2 *0.0025 cm*7.13g/cm^3}{65.38g/mol}*2 \frac{moles\ of \ electrons}{mole \ of \ Zn} * 9.65*10^4 \frac{C}{mole \ of \ electrons } ] = (20 A) t$

$t = \frac{2100}{20}$

= 105 s

8 0

2 years ago

1. For which of these elements would the first ionization energy of the atom be higher than that of the diatomic molecule?

Lyrx [107]

Answer: Option (b) is the correct answer.

Explanation:

The energy necessary to remove an electron from a gaseous atom or ion is known as ionization energy.

This means that smaller is the size of an atom more amount of energy has to be supplied to it in order to remove the valence electron. This is because in small atom or element there will be strong force of attraction between the nucleus and electrons.

So, high amount of energy has to be supplied to remove the valence electrons.

As electronic configuration of helium is $1s^{2}$ . So, due to completely filled valence shell it is more stable in nature.

As a result, we need to provide very high amount of energy to remove an electron from a helium atom.

Thus, we can conclude that out of the given options helium element would the first ionization energy of the atom be higher than that of the diatomic molecule.

7 0

2 years ago

What mass of solid NaOH (97.0 % by mass) is required to prepare 1.00 L of a 10.0% solution of NaOH by mass? The density of the 1

Lelechka [254]

<u>Answer:</u> The mass of 97 % of NaOH solution required is 114.33 g

<u>Explanation:</u>

To calculate mass of a substance, we use the equation:

$\text{Density of substance}=\frac{\text{Mass of substance}}{\text{Volume of substance}}$

We are given:

Density of 10 % solution = 1.109 g/mL

Volume of 10% solution = 1 L = 1000 mL (Conversion factor: 1 L = 1000 mL)

Putting values in above equation, we get:

$1.109g/mL=\frac{\text{Mass of }10\%\text{ solution}}{1000mL}\\\\\text{Mass of }10\%\text{ solution}=1109g$

The mass of 10 % solution is 1109 g.

To calculate the mass of concentrated solution, we use the equation:

$c_1m_1=c_2m_2$

where,

$c_1\text{ and }m_1$ are the concentration and mass of concentrated solution.

$c_2\text{ and }m_2$ are the concentration and mass of diluted solution.

We are given:

$c_1=97\%\\m_1=?g\\c_2=10\%\\m_2=1109g$

Putting values in above equation, we get:

$97\times m_1=10\times 1109\\\\m_1=114.33g$

Hence, the mass of 97 % of NaOH solution required is 114.33 g

3 0

2 years ago

Name one manufactured device or natural phenomenon that emits electromagnetic radiation in each of the following wavelengths: ra

Bas_tet [7]

Radio - Radio station transmits radio wavelength which is received by the
Radio.
<span>
Microwaves - Microwave Oven to heat up foods. </span>

<span>IR (infrared) - TV remote Control, to transmit IR light to a sensor in the TV so it can do some functions like increasing the volume, changing the channel etc. </span>

<span>Visible light - Sunlight or Light Bulbs </span>

<span>Ultraviolet - UV Lamps for sun tan, for detecting forged money </span>

<span>X-rays - Chest X-ray machines, Backscatter Xray (body scanner in airport security)
</span>
Gamma rays - Gamma rays<span> Medical Equipment which are used to kill cancer cells, to sterilize medical </span>equipment<span> </span>

7 0

2 years ago

In the following list, only ________ is not an example of a chemical reaction. the production of hydrogen gas from water the tar

Vika [28.1K]

Answer: Option (c) is the correct answer.

Explanation:

A chemical reaction is defined as the reaction where a chemical bond will break in order to form a new bond due to the formation of a new substance.

For example, $2Na + Cl_{2} \rightarrow 2NaCl$

Here, NaCl is the new substance that is formed. A chemical reaction will always bring change in chemical composition of a substance.

The production of hydrogen gas from water, the tarnishing of a copper penny, charging a cellular phone and burning a plastic water bottle are all chemical reactions.

Whereas a reaction where no change in chemical composition of a substance takes place is known as a physical reaction.

For example, chopping a log into sawdust will change the shape but it will not bring any change in chemical composition of the substance.

Thus, we can conclude that in the following list, only chopping a log into sawdust is not an example of a chemical reaction.

8 0

2 years ago