Arrow on the table below draw an
Answer:
B2O3
Explanation:
good luck have a nice day
Answer:
2.73%
Explanation:
Molarity of NaOH = 0.75 M
Density of solution = 1.1 g/mL
Mass percent of NaOH = ?
Solution:
Number of moles of NaOH = 0.75 mol from 0.75 mol/L
Mass of NaOH = number of moles × molar mass
Mass of NaOH = 0.75 mol × 40 g/mol
Mass of NaOH = 30 g
Mass of solution:
d = m/v
1.1 g/ mL = m/ 1000 mL
m = 1100 g
Percentage of NaOH:
% NaOH = mass of solute / mass of solution × 100
% NaOH = 30 g/ 1100 g × 100
% NaOH = 2.73%
The relationship between electron orbits and light emission Bohr postulate is The energy difference between two electron orbits would equal the energy of an emitted photon.
What do you mean by electron orbit?
The path of an electron around the nucleus of an atom. In atomic theory and quantum mechanics, an atomic orbital is a function describing the location and wave-like behavior of an electron in an atom.
This function can be used to calculate the probability of finding any electron of an atom in any specific region around the atom's nucleus.
What do you mean by Light emission?
Light can be produced by matter which is in an excited state and, as we will show, excitation can come from a variety of sources.
The atoms and molecules that make up matter typically emit light at characteristic energies. The light emission can be spontaneous or stimulated.
To learn more about Electron orbits and Light emission here
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Answer:
1.3×10²³ formula unit
Explanation:
Given data:
Mass of CaCl₂ = 23.8 g
Number of formula unit = ?
Solution:
Number of moles = mass/molar mass
Number of moles = 23.8 g/110.98 g/mol
Number of moles = 0.21 mol
1 mole of any substance contain 6.022×10²³ formula unit
0.21 mol × 6.022×10²³ formula unit / 1mol
1.3×10²³ formula unit
