Octane is the resistance of the burning of gasoline
It should be
60.98 grams
^ this is rounded
Answer:
The ability of the molecule to pack more tightly increases the melting point.
Explanation:
In hydrocarbons of same molecular formula, melting point is determined by:
- weak intermolecular forces
- Molecular symmetry
Higher the intermolecular forces and molecular symmetry, higher will be the melting point.
Intermolecular forces in hydrocarbons decreases with branching. Moreover, branching interfere the tight packing of the molecule in the crystal. Therefore, branched hydrocarbons tend to have lower melting point.
However, in highly branched hydrocarbons molecular symmetry increases which results in tight packing of the molecule in the crystal.
So, highly tight packed molecules tend to have high melting point.
As (CH3)2CHC(CH3)3 is highly branched and has high molecular symmetry, therefore, its melting point is highest among given.
So, among the given, option c is correct.
Answer: -
The concentration of solution which contains 2.5 g of sugar dissolved in 50 g of water is 5 % (w/w)
Explanation: -
Amount of sugar = 2.5 g
Mass of water = 50 g
Concentration of sugar = 
x 100
= 5%
Thus the concentration of sugar is 5 % (w/w)
