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
MrRissso [65]
3 years ago
9

A mothball, composed of naphthalene (C10H8), has a mass of 1.98 g . How many naphthalene molecules does it contain?

Chemistry
1 answer:
Elena-2011 [213]3 years ago
8 0
Carbon's mass number =12
Hydrogen's mass number=1
( 10×12)+(8×1)
=128
128g =1mol
------- -------
1.98g ?

1.98
------=0.015
128

1mol =6.0×10^23
------ --------------
0.015mol ?

0.015mol×6.0×10^23= 9×10^21

Thus the number of particles in 1.89 grams of napthalene is 9×10^21.

I sincerely hope this is correct.
You might be interested in
PLZ HELP!!
densk [106]
Because the cell membrane (plasmamembrane) is a membrane. Very simply put, you can think of it like a piece of cloth. If you have a piece of cloth, water can move through the small holes, but something large, like e.g. a piece of cheese cannot.

Sana maka tulong
3 0
2 years ago
Read 2 more answers
When 16.4 g of steam at 100°C condenses how much heat is released?
OLEGan [10]

Answer:

37064 J

Explanation:

Data Given:

mass of Steam (m) = 16.4 g

heat released (Q) = ?

Solution:

This question is related to the latent heat of condensation.

Latent heat of condensation is the amount of heat released when water vapors condenses to liquid.

Formula used

            Q = m x Lc . . . . . (1)

where

Lc = specific latent heat of condensation

Latent heat of  vaporization of water is exactly equal to heat of condensation with - charge

So, Latent heat of  vaporization of water have a constant value

Latent heat of  vaporization of water = 2260 J/g

So

Latent heat of condensation of water will be = - 2260 J/g

Put values in eq. 1

          Q = (16.4 g) x (- 2260 J/g)

          Q = - 37064 J

So,  37064 J of heat will be released negative sign indicate release of energy

4 0
3 years ago
Two scientists, Tara and Victor, work in the same scientific field of study. Victor asks Tara to review a research paper that he
erik [133]

Answer:

Tara does not think that Victor’s predictions are likely.

Explanation:

In order to submit the paper, he would need to be as accurate as he possible can, is Tara told him to do it again, it means that he may have made a few mistakes.

7 0
3 years ago
I need a answer ASAP
svet-max [94.6K]

Answer:

<h3>3.2 millions years old</h3>

Explanation:

i hope it helps :)

4 0
3 years ago
What happened to Mendeleev's mother after he was accepted into St. Petersburg University?
Rama09 [41]

Answer:

his mother died i think

Explanation:

Although he was not accepted, his mother was determined to give her son a first-class education and they walked to St. Petersburg. Dmitri was accepted into the Institute of Pedagogy on a full scholarship. That same year his mother died and at the age of sixteen, Dmitri was orphaned.

4 0
3 years ago
Other questions:
  • In descriptive scientific investigations, scientists often make observations to understand the interacting parts of a complex (b
    7·1 answer
  • Which solution is most dilute?
    8·1 answer
  • How do we use chemistry in our everyday life?
    9·1 answer
  • Write a net ionic equation for the reaction that occurs when excess hydrochloric acid (aq) and barium sulfite (s) are combined.
    13·2 answers
  • When do you breathe faster? why do you think you breath faster during more vigorous activities?​
    6·1 answer
  • What kind of energy transfer is occurring when the sun melts ice cream on a hot day?
    11·1 answer
  • How many moles of Na2SO4 can be made with 7.28 mol of H2SO4?
    10·1 answer
  • C2H6 + Cl* =&gt; C2H5* + HCl
    13·1 answer
  • What type of chemical reaction is 2C₄H₁₀ + 13O₂ ---&gt; 8CO₂ + 10H₂O?
    11·1 answer
  • What is the mass of sodium hydroxide in a solution that has a total mass of 5,500g and is 22% NaOH by mass
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!