Chemistry, 01.02.2021 05:10 aesthetickait

Use the concepts in this chapter to obtain an estimate for the number of atoms in the universe. Make the following assumptions: (a) Assume that all of the atoms in the universe are hydrogen atoms in stars. (This is not a ridiculous assumption because over three-fourths of the atoms in the universe are in fact hydrogen. Gas and dust between the stars represent only about 15% of the visible matter of our galaxy, and planets compose a far tinier fraction) (b)
Assume that the sun is a typical star composed of pure hydrogen with a density of 1.4 g/cm' and a radius of 7 x 10 m. (c) Assume that each of the roughly 100 billion stars in the Milky Way galaxy contains the same number of
atoms as our sun. (d) Assume that each of the 10 billion galadies in the visible universe contains the same number of atoms as our Milky Way galaxy
Express your answer using one significant figure.

Answers: 3

Show answers

Other questions on the subject: Chemistry

Chemistry, 22.06.2019 16:10, nauticatyson9

Given the following equation: 2a1 + 3mgcl2 --> 2alcl3 + 3mg how many moles of aluminum chloride are produced from 2.5 moles of magnesium chloride?

Answers: 1

continue

Chemistry, 22.06.2019 19:00, elizabethajih99

Sum of brother and sisters age is 26. four times the brothers age is subtracted from three times the sisters age, the difference is 8. what are the ages of the brother and sister?

Answers: 1

continue

Chemistry, 23.06.2019 07:00, mahogany1956

What is the difference between covalent bonds and ionic bonds? covalent bonds involve the sharing of electrons between atoms; ionic bonds involve the electrical attraction between charged atoms. covalent bonds involve the transfer of electrons between charged atoms; ionic bonds involve the sharing of electrons between atoms. covalent bonds involve the sharing of pairs of electrons between atoms; ionic bonds involve the sharing of single electrons between atoms. covalent bonds involve the sharing of electrons between atoms; ionic bonds involve the sharing of protons between charged atoms.

Answers: 1

continue

Chemistry, 23.06.2019 08:10, 20dyeaubn

Time remaining 58: 10 an atom that has 84 protons and 86 neutrons undergoes a reaction. at the end of the reaction, it has 82 protons and 84 neutrons. what happened to the atom? it accepted radiation in a chemical reaction it donated neutrons to another atom in a chemical reaction it emitted an alpha particle in a nuclear reaction. it accepted protons in a nuclear reaction. mark this and retum save and exit next submit

Answers: 3

continue

You know the right answer?

Use the concepts in this chapter to obtain an estimate for the number of atoms in the universe. Make...