Answer:
2 pairs (4 electrons)
Explanation:
In a molecule of oxygen there are 2 oxygen atoms. There are 6 electrons in the outer shells of oxygen atoms. When 2 oxygen atoms form a covalent bond they share their electrons. In a diagram this would be represented by the overlap of the two circles representing the outer shells of both oxygen atoms. If each oxygen atom 'puts forward' 2 electrons into the centre, then 4 will be shared overall for each atom, making both atoms have full outer shells of 8 electrons each. 4 electrons make 2 pairs, hence the answer.
Answer:
120°
Explanation:
Valence electrons of boron = 2
Valence electrons of chlorine = 7
The total number of the valence electrons = 3 + 3(7) = 24
The Lewis structure is drawn in such a way that the octet of each atom in the molecule is complete. So,
The Lewis structure is:
There is no lone pair involved, so, It is of type AB₃.
According to the theory, the atoms will form a geometry in such a way that there is minimum repulsion and maximum stability.
So, it is of triangular shape, with bond angle , 120 ° .
Answer:
450.0 L.
Explanation:
- We can use the general law of ideal gas: <em>PV = nRT.</em>
where, P is the pressure of the gas in atm.
V is the volume of the gas in L.
n is the no. of moles of the gas in mol.
R is the general gas constant,
T is the temperature of the gas in K.
- If n and T are constant, and have different values of P and V:
<em>(P₁V₁) = (P₂V₂).</em>
<em></em>
V₁ = 760.0 L, P₁ = 450.0 mm Hg,
V₂ = ??? L, P₂ = 760.0 mm Hg (standard pressure = 1.0 atm = 760 mm Hg).
∴ V₂ = (P₁V₁)/(P₂) = (760.0 L)(450.0 mm Hg)/(760.0 mm Hg) = 450.0 L.
Answer:
Mass = 255 g
Explanation:
Given data:
Number of moles of nitrogen = 7.5 mol
Mass of ammonia formed = ?
Solution:
Chemical equation:
3H₂ + N₂ → 2NH₃
Now we will compare the moles of nitrogen and ammonia.
N₂ : NH₃
1 : 2
7.5 : 2/1×7.5 = 15
Mass of ammonia:
Mass = number of moles × molar mass
Mass = 15 mol × 17 g/mol
Mass = 255 g
<h2>answer:</h2>
Various Constituents of Petroleum and their Uses
Constituents of Petroleum
Kerosene
uses➪ Fuel for stoves, in lamps and as aviation fuel for jet aircrafts
Constituents of Petroleum
LPG
uses➪ Fuel for home and industry
Constituents of Petroleum
Lubricating oil
uses➪Used for Lubrication in machines and engines
Constituents of Petroleum
Paraffin wax
uses➪ Ointments, candles, vaseline etc.
