Explanation:
The term means change in entropy. As entropy means the measure of randomness. This means that more randomly molecules of a substance are moving more will be its entropy.
If value of is negative then it means there is decease in entropy. When value of is positive then it means there is increase in entropy.
In solids, molecules are closer to each other. So, entropy is minimum. Liquids has more entropy than solids and gases has maximum entropy.
- In the reaction, , total 4 moles of gases form 2 mole of a gas. This means there is decrease in number of moles. As a result, there will be decrease in entropy. So, sign of is negative.
- In the reaction, , total 1 mole of solid substance is forming total 2 moles of gases. That is, there is increase in entropy. So, sign of is positive.
- In the reaction, , total 2 moles of gases are forming total 1 mole of liquid methanol. That is, there is decrease in entropy. So, sign of is negative.
- In the reaction, , total 2 moles of substance is forming total 4 moles of substance. That is, there is increase in entropy so, sign of is positive.
Manganese since 25 protons is 25 atomic number
Answer:
2.15 mg of uranium-238 decays
Explanation:
For decay of radioactive nuclide-
where N is amount of radioactive nuclide after t time, is initial amount of radioactive nuclide and is half life of radioactive nuclide
Here , and
So,
so, N = 2.446 mg
mass of uranium-238 decays = (4.60-2.446) mg = 2.15 mg
Hey there!
The mass number is the total count of protons and neutrons in the nucleus of the atom.
The atomic mass is the weighted average of mass number. Many elements have isotopes, which have different amounts of neutrons, so the mass number is different for each isotope.
If boron has an atomic mass of 10.811, that means the weighted average of mass numbers for boron is 10.811 amu. One mole of boron will also have a mass of 10.811 grams.
Hope this helps!