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svlad2 [7]
3 years ago
12

Please help me I will give you the brain thing with extra points if you help me, please. I need to get this right. 2/10

Chemistry
2 answers:
ziro4ka [17]3 years ago
8 0
The answer would be D
bixtya [17]3 years ago
7 0

Answer: D.

Explanation:

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A mixture of methane and krypton gases is maintained in a 8.99 L flask at a pressure of 1.68 atm and a temperature of 46 °C. If
sweet-ann [11.9K]

Answer:

22.81 g

Explanation:

Given that:

Pressure = 1.68 atm

Temperature = 46 °C

The conversion of T( °C) to T(K) is shown below:

T(K) = T( °C) + 273.15  

So,  

T = (46 + 273.15) K = 319.15 K

Volume = 8.99 L

Using ideal gas equation as:

PV=nRT

where,  

P is the pressure

V is the volume

n is the number of moles

T is the temperature  

R is Gas constant having value = 0.0821 L.atm/K.mol

Applying the equation as:

1.68 atm × 8.99 L = n × 0.0821 L.atm/K.mol × 319.15 K

<u>⇒n = 0.5764 moles </u>

Given that :

Amount of methane = 4.88 g  

Molar mass = 16.04 g/mol

The formula for the calculation of moles is shown below:

moles = \frac{Mass\ taken}{Molar\ mass}

Thus,

Moles= \frac{4.88\ g}{16.04\ g/mol}

Moles= 0.3042\ mol

<u>Moles of Krypton = Total moles - Moles of methane = 0.5764 - 0.3042 moles = 0.2722 moles</u>

Also, Molar mass of krypton = 83.798 g/mol

So,

The formula for the calculation of moles is shown below:

moles = \frac{Mass\ taken}{Molar\ mass}

Thus,

0.2722\ moles=\frac{Mass}{83.798\ g/mol}

<u>Mass of krypton = 22.81 g</u>

6 0
3 years ago
Weight is best described as:
riadik2000 [5.3K]
<span>Weight measured as a force in Newtonsis best described by the answer that is listed under option C. It is a measure of gravitational force on an object. So, interestingly an item with a specific mass of say 120KGs on earth would weigh 1200 N but on the moon only weigh 200 N due to the smaller gravitational force.</span>
3 0
3 years ago
Read 2 more answers
If 852.04 g Al(NO3)3 reacted with the 741.93 g Na2CO3, which would be the limiting reagent?
Sedaia [141]

Answer:

Al(NO3)3

Explanation:

6 0
3 years ago
Starting with the water in the ocean place the below steps in the correct order showing how water moves through this cycle
ruslelena [56]

Answer:

C, A, D and B

Explanation:

Water evaporates from the surface of the oceans leaving behind salts. As water vapor rises, it collects and is stored in clouds.

As water cools in the clouds, condensation occurs. Condensation is when gases turn back into liquids.

Condensation creates precipitation. Precipitation includes rain, snow, hail and sleet. The precipitation allows the water to return again to the Earth's surface.

When precipitation lands on land, the water can sink into the ground to become part of our underground water reserves, also known as groundwater.

7 0
3 years ago
A sample of nitrogen gas with a volume of 180 cm at a temperature of
maksim [4K]

Answer:

The final pressure of gas is 82.64 KNm⁻²

Explanation:

Given data:

Initial volume of gas = 180 cm³

Temperature of gas = 27°C

Initial pressure = 101 KNm⁻²

Final volume = 220 cm³

Final pressure = ?

Solution:

The given problem will be solved through the Boly's law,

"The volume of given amount of gas is inversely proportional to its pressure by keeping the temperature and number of moles constant"

Mathematical expression:

P₁V₁ = P₂V₂

P₁ = Initial pressure

V₁ = initial volume

P₂ = final pressure

V₂ = final volume  

Now we will put the values in formula,

P₁V₁ = P₂V₂

101 KNm⁻² × 180 cm³ = P₂ × 220 cm³

P₂ = 18180 KNm⁻². cm³/220 cm³

P₂ = 82.64 KNm⁻²

The final pressure of gas is 82.64 KNm⁻².

4 0
3 years ago
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