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
RoseWind [281]
3 years ago
8

You have a partially filled party balloon with 2.00 g of helium gas. you then add 2.74 g of hydrogen gas to the balloon. assumin

g constant temperature and pressure, how many times bigger is the party balloon - comparing before and after the hydrogen gas has been added?
Chemistry
1 answer:
Elanso [62]3 years ago
5 0
First, we need to get moles of He:

moles of He = mass/molar mass of He

when the molar mass of He = 4 g/mol
                     
and when the mass = 2 g 
 
by substitution:

  moles of He = 2 g / 4 g/mol 

                        = 0.5 moles

and when V = nRT/P and n is the number of moles

so, V1 = 0.5RT/P

then, we need moles of H2 = mass / molar mass 

                                               = 2.74g / 2g/mol

                                               = 1.37 moles

∴ moles of He + moles of H2 = 0.5 moles + 1.37 moles 

                                                 = 1.87 moles

so, V2= 1.87RT/P

from the V1 and V2 formula:

∴V2/V1 = 1.87 / 0.5

              = 3.74 

∴ the party balloon is 3.74 times bigger
You might be interested in
What's the word of a theory that states that earths crust and upper mantle are broken into sections which move around on a speci
zaharov [31]
The Plate Tectonic Theory
5 0
3 years ago
Read 2 more answers
THE RIGHT ANSWER WILL RECIEVE A BRAINLEST AND POINTS!!!
earnstyle [38]
If you drop a bath bomb into water, then it will fizz because a chemical reaction is taking place.
8 0
3 years ago
Read 2 more answers
What is the product of the reaction of (S)-2-bromobutane with sodium methoxide in acetone?
Serggg [28]

Answer:

2-methoxybutane

Explanation:

This reaction is an example of Nucleophilic substitution reaction. Also, the reaction of (S)-2-bromobutane with sodium methoxide in acetone, is bimolecular nucleophilic substitution (SN2). The reaction equation is given below.

(S)-2-bromobutane + sodium methoxide (in acetone) → 2-methoxybutane

7 0
3 years ago
A solution of phosphoric acid was made by dissolving 10.8 g of H3PO4 in 133.00 mL of water. The resulting volume was 137 mL. Cal
Nesterboy [21]

Answer:

Density is: 1.05 g/ml

Mole fraction solute: 0.015

Mole fraction solvent:  0.095

Molarity: 0.80 M

Molality: 0.82 m

Explanation:

A typical excersise of solution.

It is more confortable to make a table for this.

                |   masss  |  volume  |  mol

solute       |                |                |          

solvent     |                |                |  

solution    |                |                |

Let's complete, what we have.

                 |   masss  |  volume  |  mol

solute       |  10.8g     |                |          

solvent     |                |  133 mL   |  

solution    |                |  137 mL    |

We can first, know how many moles are 10.8 g

Molar Mass H3PO4 = 97.99 g/mol

Mass / Molar mass = mol

10.8 g / 97.99 g/m = 0.110 mol

Density of water is 1 g/ml (it is a very knowly value)

From this data, we can know water mass, solvent.

Density = mass / volume

1 g/ml = mass / 133 mL

Mass = 133 g

We can also have the moles, by the molar mass of water 18 g/m

133 g / 18 g/m = 7.39 mol

                 |   masss  |  volume  |  mol

solute       |   10.8g     |                |   0.110 mol      

solvent     |   133g      |  133 mL   |  7.39 mol

solution    |   143.8g   |  137 mL   | 7.50 mol

Mass of solution will be solute mass + solvent mass

Moles of solution will be solute moles + solvent moles

Now we can calculate everything.

Molarity means mol of solute in 1 L of solution. (mol/L)

We have to convert 137 mL in L (/1000)

0.137L so → 0.110 m / 0.137L = 0.80 M

Molality means mol of solute in 1kg of solvent.

We have to convert 133g in kg (/1000)

0.133 kg so → 0.110 m/0.133 kg = 0.82 m

Density is mass / volume

Solution density will be solution mass / solution volume

143.8 g/137 mL = 1.05 g/m

Molar fraction is : solute moles / total moles  or  solvent moles/total moles.

You can also (x 100%) to have a percent of them.

Remember sum of molar fraction = 1

Molar fraction of solute = 0.110 mol / 7.50mol = 0.015

Molar fraction of solvent = 7.39 mol / 7.50 mol = 0.985

5 0
3 years ago
After a covalent bond has stabilized an atom, the atom will have
Dafna1 [17]

<em>Answer:</em>

  • The atom have a full valence electron shell.

<em>Explanation:</em>

  • My question is that why covalent bonds take place?

Every atoms tends to from bond with another atoms in order to get nearest electronic configuration of nobel gases. They become stable when their valence shell become complete. So when covelant bond forms between atoms, share electrons to each other and stabilize themselves.

5 0
3 years ago
Read 2 more answers
Other questions:
  • What's a closed system?Explain​
    15·2 answers
  • What is the mass of a light bulb
    12·1 answer
  • Describe the best way Ryan can increase the rate of dissolving of lead (II) chloride in a solution.
    7·2 answers
  • Balance each equation by entering the correct coefficients.
    12·1 answer
  • Identify possible products of dehydrohalogenation of trans-1-bromo-2-methylcyclohexane
    13·1 answer
  • Iron-56, Iron-54, and Iron-58 are all ____ of iron
    12·2 answers
  • What's the mass of methanol?
    6·2 answers
  • Someone please give me a sentence using “chemical bond”
    6·1 answer
  • Which of these pairs of atoms are isotopes?
    5·1 answer
  • Temperature definition
    14·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!