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
dedylja [7]
3 years ago
7

How many moles of helium gas are contained in a 4.0-L flask at STP?

Chemistry
2 answers:
ExtremeBDS [4]3 years ago
7 0

Answer:

0.1784 moles of helium gas are contained in a 4.0-L flask at STP.

Explanation:

At STP. temperature of the helium gas = T = 273.15 K

At STP, pressure of the helium  gas = P = 1 atm

Volume of the helium  gas at STP  = V = 4.0 L

Moles of the helium  gas = n

Using an ideal gas equation :

PV=nRT

n=\frac{PV}{RT}=\frac{1 atm\times 4.0 L}{0.0821 atm L/mol K\times 273.15 K}

n = 0.1784 mol

0.1784 moles of helium gas are contained in a 4.0-L flask at STP.

mel-nik [20]3 years ago
4 0
1.0 mole of gas at STP occupies 22.4 Litres.
4/0L / 22.4 L/mole = 0.179 moles He.
You might be interested in
The decomposition of water is used to show which of the following?
horsena [70]
Shows that water is a compound...
made up of 2 hydrogen atoms and 1 oxygen atom...=H2O...
decomposition of water is by electrolysis which splits the compound!
hope this helps!
4 0
3 years ago
Consider the following reaction at equilibrium: 2 NH3(g) ⇄ N2(g) + 3 H2(g) What does Le Chatelier's principle predict will happe
BabaBlast [244]

Answer : The equilibrium will shift in the left direction.

Explanation :

Le-Chatelier's principle : This principle states that if any change in the variables of the reaction, the equilibrium will shift in the direction to minimize the effect.

The given reaction is:

2NH_3(g)\rightleftharpoons N_2(g)+3H_2(g)

As per question, when we are adding N_2  then the concentration of N_2 is increased on product side then the equilibrium will shift in the direction where decrease of concentration of N_2 takes place. Therefore, the equilibrium will shift in the left direction.

Thus, the equilibrium will shift in the left direction.

7 0
3 years ago
2C_H. + 702 — 400, + 6H2O
astra-53 [7]

Balanced Eqn

2

C

2

H

6

+

7

O

2

=

4

C

O

2

+

6

H

2

O

By the Balanced eqn

60g ethane requires 7x32= 224g oxygen

here ethane is in excess.oxygen will be fully consumed

hence

300g oxygen will consume  

60

⋅

300

224

=

80.36

g

ethane

leaving (270-80.36)= 189.64 g ethane.

By the Balanced eqn

60g ethane produces 4x44 g CO2

hence amount of CO2 produced =

4

⋅

44

⋅

80.36

60

=

235.72

g

and its no. of moles will be  

235.72

44

=5.36 where 44 is the molar mass of Carbon dioxide

hope this helps

6 0
3 years ago
The chemical process of photosynthesis is one that requires a constant supply of energy to proceed; in this
astra-53 [7]

Answer:-

pls find the answer in description

Explanation:

if u are here u are a fool for shure

4 0
3 years ago
two students are working together to build a birdhouse. Student 1 applies a force of 10 N to a wooden board in order to slide it
Ganezh [65]

Answer:

6

Explanation:

if there is 10n and the friction is 4n on the table then it is 6n.

i hope this helps you! :)

5 0
2 years ago
Other questions:
  • The key on a pie chart represents...
    10·2 answers
  • What happens to earth materials when water flows over landforms?
    11·1 answer
  • What happens to the total mass of a substance undergoing a physical change
    8·2 answers
  • 30 POINTS IF YOU CAN FIND THE ANSWER. When is Earth's axis tilted neither toward nor away from the sun?
    7·1 answer
  • Scandium (II) Oxide<br><br> A. ScO2<br><br> B. Sc2O2<br><br> C. ScO<br><br> D. ScC2O4
    15·1 answer
  • A compound is found to contain 39.99 % carbon, 6.727 % hydrogen, and 53.28 % oxygen by weight. To answer the questions, enter th
    11·1 answer
  • Find ΔHrxn for the following reaction: <br><br> 2PbS(s)+3O2(g)→2PbO(s)+2SO2(g)
    11·1 answer
  • The properties of several unknown solids were measured. Solid Melting point Other properties A &gt;1000 °C does not conduct elec
    14·2 answers
  • From the information presented in the movie, what can you
    5·1 answer
  • What is meant by the term isotopes?
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!