1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
velikii [3]
3 years ago
5

It takes 167 s for an unknown gas to effuse through a porous wall and 99 s for the same volume of n2 gas to effuse at the same t

emperature and pressure. what is the molar mass of the unknown gas?
Chemistry
1 answer:
irakobra [83]3 years ago
3 0

Answer : The molar mass of the unknown gas will be 79.7 g/mol


Explanation : To solve this question we can use graham's law;


Now we can use nitrogen as the gas number 2, which travels faster than gas 1;

So, 167 / 99 = 1.687 So the nitrogen gas is 1.687 times faster that the unknown gas 1

We can compare the rates of both the gases;


So here, Rate of gas 2 / Rate of gas 1 = \sqrt{(molar mass 1 / molar mass 2)}

Now, 1.687 = square root [\sqrt{(molar mass 1) / (28.01 g/mol N_{2})} ]


When we square both the sides we get;


2.845 = (molar mass 1) / (28.01 g/mol N2)


On rearranging, we get,


2.845 X (28.01 g/mol N2) = Molar mass 1

So the molar mass of unknown gas will be = 79.7 g/mol

You might be interested in
Give regents and mechanism
Kryger [21]

Answer:

Reagents: 1) BH_3 2) H_2_O2, OH^-

Mechanism: Hydroboration

Explanation:

In this case, we have a <u>hydration of alkene</u>s reaction. But, in this example, we have an <u>anti-Markovnikov reaction</u>. In other words, the "OH" is added in the least substituted carbon. Therefore we have to choose an anti-Markovnikov reaction: <u>"hydroboration"</u>.

The <u>first step</u> of this reaction is the addition of borane (BH_3) to the double bond. Then in the <u>second step</u>, we have the deprotonation of the hydrogen peroxide, to obtain the peroxide anion. In the <u>third step</u>, the peroxide anion attacks the molecule produced in the first step to produce a complex compound in which we have a bond "BH_2-O-OH". In <u>step number 4</u> we have the migration of the C-B bond to oxygen. Then in <u>step number 5</u>, we have the attack of OH^- on the O-BH_2 to produce an alkoxide. Finally, the water molecule produce in step 2 will <u>protonate</u> the molecule to produce the alcohol.

See figure 1

I hope it helps!

4 0
3 years ago
How does the arrangement of particles determine the physical properties of different states of matter?​
Usimov [2.4K]

Answer:

See explanation

Explanation:

Matter may exist in three phases; solid, liquid and gas. The state in which matter exists depends on the extent of intermolecular forces operating in the substance.

In solid particles, the molecules that compose the solid are close together because the molecules of a solid do not move from place to place but they continue to vibrate about their fixed position.

For liquids, the molecules that compose a liquid are in random motion but are less energetic than molecules of a gas.

In gases, the molecules are not held together at all. The molecules of a gas have the highest degree of freedom. They move from one point another at a high velocity.

Hence, the order of increasing degree of movement of the particles in different states of matter = solids<liquids< gases.

Solids have well arranged particles, the molecules of a liquid are a little more disorderly than liquid particles while gas particles are the most disorderly of all the states of matter.

6 0
2 years ago
Suppose a mercury thermometer contains 3.250g of mercury and has a capillary that is 0.180mm in diameter.. How far does the merc
Helga [31]
1) You need to get volume of both temperatures by using first attached formula V= Mass/DensityV_1 = (3.250 g)/(13.596 g/(cm^3)) = .2390 cm^3&#10;At 25 degrees C (V_2e have:&#10;&#10;V_2  = (3.250 g)/(13.534 g/(cm^3)) = .2401 cm^3

2) Using the second formula you get the height of 0 degree 
h = V/(pi * r^2)&#10;&#10;&#10;h_1 =(.2390 cm^3)/(pi*(.009 cm)^2)  = 939.2 cm

(radius in cm is (0.180 mm) / 2 * (1 cm)/(10 mm) or .009 cm

3) Then with h1 you can easily get the height of 25 degrees 
h_2 =(.2401 cm^3)/(pi*(.009 cm)^2) = 943.5 cm

 Subtract 943.5 cm - 939.2 cm, and obtain a rise in mercury height of 4.3 cm

5 0
3 years ago
Read 2 more answers
Calculate the density of a 20.015 g object that occupies 5.44 cm3 .
Scilla [17]

Answer:

density =  \frac{mass}{volume}  \\  \\ density =  \frac{20.015}{5.44}  \\  \\ { \boxed{ \boxed{density = 3.679 \: g {cm}^{ - 3} }}}

5 0
2 years ago
Read 2 more answers
a 6.7 volume of air, initially at 23 degrees celsius and .98 atm, is compressed to 2.7 L while heated to 125 degrees celsius. Wh
Annette [7]
Data:

V1 = 6.7 liter
T1 = 23° = 23 + 273.15 K = 300.15 K
P1 = 0.98 atm

V2 = 2.7 liter
T2 = 125° = 125 + 273.15 K = 398.15 K
P2 = ?

Formula:

Combined law of ideal gases: P1 V1 / T1 = P2 V2 / T2

=> P2 = P1 V1 T2 / (T1 V2)

P2 = 0.98 atm * 6.7 liter * 398.15 K / (300.15K * 2.7 liter)

P2 = 3.22 atm
6 0
3 years ago
Other questions:
  • At a certain temperature this reaction follows second-order kinetics with a rate constant of 0.118 M^-1* s^-1:
    13·1 answer
  • You have a piece of gold jewelry weighing 9.35g. Its volume is 0.654cm 3 . Assume the metal is an alloy of gold and silver, whic
    6·1 answer
  • HELP ME ASAP!!!!!!!!
    6·1 answer
  • In its aqueous solution, 32% of a substance dissociates to release hydroxide ions. Which of the following is true for the substa
    13·1 answer
  • Once the sun goes down will the air or water cool of faster
    13·2 answers
  • An experiment was undertaken to determine the effect of different liquids upon the swelling of a vulcanized sample of natural ru
    5·1 answer
  • In the reaction below green chlorine gas and brown
    11·1 answer
  • Plz help me asap even faster then asap
    14·1 answer
  • What is20 grams of HNO^3
    10·2 answers
  • hello frds need help (@_@;) The lower end of thistle funnel should be dipped in solution why Give reason .I will give brainlest
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!