One mole of n-pentane on complete combustion under
standard conditions liberates 3500 kJ of heat. Heat of
formation of n-pentane is
Stress
[AH; of CO2 =-390 kJ mor' and
AH of H2O = -285 kJ mol']
+145 kJ mol-1
+120 kJ mol-1
: Sepals in
ens five, epipetalous
: Petals five, gamop
on axile.
carpous, ovary sup
-90 kJ mol-1
-160 kJ mol-1
Answers
Explanation:
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N-pentane (normal pentane) Applications.
Pentanes are some of the primary blowing agents used in the production of polystyrene foam and other foams. Usually, a mixture of n-, i-, and increasingly cyclopentane is used for this purpose. Because of its low boiling point, low cost, and relative safety, pentane is used as a working medium in geothermal power stations. It is added into some refrigerant blends as well.
N-pentanes are relatively inexpensive and are the most volatile alkanes that are liquid at room temperature, so they are often used in the laboratory as solvents that can be conveniently evaporated. However, because of their nonpolarity and lack of functionality, they can only dissolve non-polar and alkyl-rich compounds. Pentanes are miscible with most common nonpolar solvents such as chlorocarbons, aromatics, and ethers. They are also often used in liquid chromatography.
SPECIFICATIONS
Appearance : Colourless and not turbid
Sp.Gr(60F/60F): 0.6200~0.6500
Cyclopentane %: ≤0.60
Normal Pentane %: ≥95
ISO pentane %: Balance
Other Hydro Carbon %: ≤1
Total Oleffine %: ≤0.1
Moisture %: ≤0.01
Color Saybolt: ≥+30
Cu-Currosion: ≤1a
Total Sulfur: ≤0.0001
N-pentane (normal pentane) Physical Parameters
N-pentane Basic Information
English Name: Normal pentane
CAS Number: 109-66-0
Colour: Colourless
Appearance: clear, colorless liquid
Chemical name: N-Pentane
Chemical formula: C5H12
Boiling point (°C): 36.1 °C
melting point: -129.8°C
Saturated vapor pressure: 53.32kPa/18.5℃
Range of flammability (vol% in air): 1.7-9.8
Flash Point: -49°C
Specific Gravity: 0.63
Vapor Density: 2.48g/L
Vapor pressure 57.90 kPa (at 20.0 °C)
Synonyms: N-pentane, normal pentane, Pentane, Quintane, Pentane mixed isomers.
Answer:
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