Answer:
1.60 is the van't Hoff factor for ammonium chloride in X.
Explanation:
...(1)
where,
=Elevation in boiling point =
i = van't Hoff factor
= Freezing point constant
m = molality
1) When 70.4 g of benzamide are dissolved in 850. g of a certain mystery liquid X.
Mass of benzamide = 70.4 g
Molar mass of benzamide = 121 g/mol
i = 1 (organic molecule)
Mass of liquid X = 850 g = 0.850 kg
= Freezing point constant of liquid X= ?
Putting all value in a (1):
2) When 70.4 g of ammonium chloride are dissolved in 850. g of a certain mystery liquid X.
Mass of ammonium chloride= 70.4 g
Molar mass of ammonium chloride = 53.5 g/mol
i = ? (ionic molecule)
Mass of liquid X = 850 g = 0.850 kg
Putting all value in a (1):
i = 1.6011 ≈ 1.60
1.60 is the van't Hoff factor for ammonium chloride in X.
Answer:
Lewis structure of 
has been given below and formal charge of S is +2
Explanation:
- Lewis structure is drawn by placing least electronegative atom (except H) as central atom. Here S is least electronegative atom. Hence S is the central atom.
- Total valence electrons are calculated by adding valence electrons of all the constituting atoms. These electrons are used to make Lewis structure by fulfilling octet of all atoms and duet of hydrogen atoms.
- Total valence electron in is 24. Octet of S and two oxygen atoms should be fulfilled by using 18 electrons to draw Lewis structure.
- Formal charge on an atom = (no. of valence electrons)-(no. of covalent bonds)-(no. of electrons in lone pair/2)
- Lewis structure is given below
Answer:
Color is emitted from an atom when an electron jumps from a higher energy level to a lower energy level
Explanation:
According to Bohr's model of the atom, electrons are arranged into circular orbits, each orbit corresponding to a precise energy level.
In this model of the atom, electrons cannot be between two orbits: this means that the energy level of the atom are discrete, so they can only assume certain values.
As a result, when an electron jumps between two energy levels, it emits/absorbs a photon whose energy is equal to the difference in energy between the two levels.
In particular:
- If an electron jumps from a lower energy level to a higher energy level, it absorbs a photon
- If an electron jumps from a higher energy level to a lower energy level, it emits a photon
The energy of the emitted photon is equal to the difference in energy between the two levels, and it is related to the wavelength 
of the photon by
where h is the Planck's constant and c the speed of light.
For usual gases, the value of the energy E is such that the value of the wavelength falls within the visible light range of the electronmagnetic spectrums, so we observe light emitted as different colors, depending on the wavelength.
