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
Serhud [2]
2 years ago
6

A balloon contains 8.4 L of helium gas at STP. How many moles of helium are in the balloon? 0.38 moles He ,190 moles He ,2.1 mol

es He ,8.4 moles He
Chemistry
1 answer:
damaskus [11]2 years ago
8 0

Answer:

0.38 moles He

Explanation:

from the  ideal gas law PV= nRT you can calculate the volume of 1 mole at STP (273..1K  and 1 atm of pressure)  the MOLAR VOLUME IS

22.4 L

In the problem you have 8.4L

8.4 L/22.4 L=0.375 moles

so

0.38 moles He

You might be interested in
When a substance undergoes a chemical change, the product exhibits different physical properties than the starting material. Des
elena55 [62]

Answer:

I) Change in solubility

II) Change in boiling point

III) Change in colour

Explanation:

A chemical change involves formation of new products and is not reversible.

So, once two liquid solutions are mixed and a chemical change takes place, the new product will have the following:

- a new solubility rate, i.e it will dissolve at a rate different from the two liquid solution

- a new boiling point i.e it takes a new point at which its molecules liberate to yield vapour

- a new colour might be detected, as the individual solution each has its own colour

6 0
3 years ago
During an experiment a thermometer was placed in a beaker containing hydrogen peroxide. The following observations were recorded
Rudiy27

Answer:

Chemical

Explanation:

The change was chemical, because it can no longer be returned to the original form. You cannot get back the bubbles or fizz from the air.

3 0
3 years ago
Read 2 more answers
c) If a mixture of zinc powder and cobalt(II) oxide is heated, the following reaction occurs: Zn(s) + COO(s) → ZnO(s) + Co(s) (i
bazaltina [42]

Answer:

The metal which reduces the other compound is the one higher in reactivity. So in this case, it is.

Explanation:

5 0
2 years ago
Electronegativity is defined as a measure of the tendency of atoms to attract electrons in a chemical bond.
stira [4]
True.......................................
4 0
3 years ago
No links plz!!<br>CaOCl2 parent acid and base???​
Vesnalui [34]

Answer:

this is not and reaction of acid and base.(CaOCL2)

Explanation:

Ca2, Cl, are base and O is a neutral.

so how can that be a acid and base reaction

4 0
2 years ago
Other questions:
  • A chocolate chip cookie can be separated by physical means, and it is not the same throughout.
    13·2 answers
  • Butane is used as a fuel in camping gas stoves.100 cm3 of butane is burned in excess oxygen .calculate the volume of carbon diox
    14·1 answer
  • What do carbon 12 carbon 13 and carbon 14 have in common?
    7·1 answer
  • The molecular mass of propane-1,2-diol is 76.1 amuamu . Calculate the molecular mass of propane-1,3-diol, an isomer of propane-1
    6·2 answers
  • Based on your knowledge of chemical equations, what do you know for sure
    6·1 answer
  • In a chemical reaction, the mass of the products is equal to __. 11
    12·1 answer
  • Which atomic model states that it is impossible to know the exact location of electrons around the nucleus?
    9·1 answer
  • 1. Which individuals are most likely to die before reproducing, those with adaptive traits or
    8·1 answer
  • Which of these elements has the smallest atomic radius?
    13·1 answer
  • If 50 milliliters of 0.50 M HCl is used to completely neutralize 25 milliliters of KOH solution, what is the molarity of the bas
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!