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
netineya [11]
2 years ago
9

A star is estimated to have a mass of 2.0 x 10 ^36kg. Assuming it to be a sphere of average radius of 7.0 x 10 ^5 km. Calculate

the average density of the star in g/cm^3 and in lb/ft^3
Chemistry
1 answer:
Montano1993 [528]2 years ago
6 0

Answer:

<em>a)</em> <em>1.392 x 10^6 g/cm^3</em>

<em>b) 8.69 x 10^7 lb/ft^3</em>

<em></em>

Explanation:

mass of the star m =  2.0 x 10^36 kg

radius of the star (assumed to be spherical) r = 7.0 x 10^5 km = 7.0 x 10^8 m

The density of substance ρ = mass/volume

The volume of the star = volume of a sphere = \frac{4}{3}\pi  r^{3}

==> V = \frac{4}{3}*3.142*(7.0*10^8)^{3} = 1.437 x 10^27 m^3

density of the star ρ = (2.0 x 10^36)/(1.437 x 10^27) = 1.392 x 10^9 kg/m^3

in g/cm^3 = (1.392 x 10^9)/1000 = <em>1.392 x 10^6 g/cm^3</em>

in lb/ft^3 =  (1.392 x 10^9)/16.018 = <em>8.69 x 10^7 lb/ft^3</em>

You might be interested in
Which of the following procedures is used during the fractional distillation of petroleum?
dem82 [27]
Increase at the temperature
7 0
2 years ago
Explain in terms of chemical reactivity why the elements in group 18 on the modern periodic table were not identified by Mendele
Makovka662 [10]

Answer:

elements tend not to react with other elements, there were no oxide compounds for Mendeleev to study. –Group 18 elements are generally unreactive. sodium ion is smaller because the sodium atom lost one electron. –An Na+ ion is smaller because it has one fewer electron shell.

Explanation:

can you me as brainliest if its right? i just need a few more to rank up! ^-^

Also have a great day and good luck in your studies!

6 0
2 years ago
in this cut-away image of an atom, where is the red arrow most likely pointed at the greatest probability of locating an electro
emmasim [6.3K]

Answer:

c

Explanation:

3 0
3 years ago
Read 2 more answers
Which of these changes will increase the vapor pressure of water in a sealed container?
Vlad1618 [11]

Answer:

Option B

Explanation:

Salt is a non-volatile solute and hence adding salt will increase the boiling point of water and hence reduce the vapor pressure. While on the other hand, adding more water will require more time to boil and hence produce vapor and thus the vapor pressure. Shaking will also not help in increasing the vapor pressure. Thus, only increasing the temperature of the water will create more vapors at a faster rate and hence increase the vapor pressure.

Thus, option B is the correct answer

3 0
2 years ago
The graph below shows the decay of a radioactive isotope. What is the half-life of the isotope?
Stells [14]
I think the answer is b
3 0
3 years ago
Other questions:
  • How many total atoms are in 0.210 g of P2O5?
    8·1 answer
  • Which equation represents a physical change?
    10·2 answers
  • Which p[robing question lies within the scope of physic?
    5·1 answer
  • If an atom has 16 protons, 14 neutrons, and 18 electrons. What is the charge of the nucleus?
    7·1 answer
  • What is the velosity of a 72.3 kg jogger with a kinetic energy of 1080.0 J?
    8·1 answer
  • Elastic energy is stored when an object is stretched. Is this an example
    11·1 answer
  • What is the maximum number of electrons an s subshell can have?
    6·2 answers
  • Polly wants a white cracker
    7·1 answer
  • US<br> What is the percent of H in<br> NH3?<br> (H = 1.008 amu, N = 14.01 amu)<br> [?]%
    12·2 answers
  • Choose the molecule with the strongest internal bond, (intra-, not intermolecular bond) ​
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!