Answer:
Enthalpy of vaporization = 30.8 kj/mol
Explanation:
Given data:
Mass of benzene = 95.0 g
Heat evolved = 37.5 KJ
Enthalpy of vaporization = ?
Solution:
Molar mass of benzene = 78 g/mol
Number of moles = mass/ molar mass
Number of moles = 95 g/ 78 g/mol
Number of moles = 1.218 mol
Enthalpy of vaporization = 37.5 KJ/1.218 mol
Enthalpy of vaporization = 30.8 kj/mol
Answer : The correct option is (A).
Explanation :
- Endothermic reaction : When two liquids are combine into a flask, then the flask feels cold when we touch it because the system absorbed heat from the surrounding.
In general, endothermic process absorbs heat and cool the surrounding.
- Exothermic reaction : When two liquids are combine into a flask, then the flask feels hot when we touch it because the system released heat into the surrounding.
In general, exothermic process releases heat and rise the temperature of surrounding.
Answer:
At 3 mmHg and 50°C water exists as a <em><u>gas</u></em>.
Dalton model :) Hope this helped.
Answer:
a. 2
b. 10
c. 6
d. 14
Explanation:
The maximum number of the electrons which can be filled in the s orbital are:- 2
The maximum number of the electrons which can be filled in the p orbital are:- 6
The maximum number of the electrons which can be filled in the d orbital are:- 10
The maximum number of the electrons which can be filled in the f orbital are:- 14
Thus,
a. 3s can have maximum of 2 electrons.
b. 3d can have maximum of 10 electrons.
c. 4p can have maximum of 6 electrons.
d. 4f can have maximum of 14 electrons.