Physical Chemistry Answers

dear sir
subect: heating value fuel
I have a question about HHV(HIGHER HEAING VALUE) &NHV(NET OR LOWER HEATING VALUE) IN FUELS.I KNOW DIFFERENT IS ABOUT WATER. BUT WHEN WE USE HHV OR NHV IN INDUSTRY? OR WHAT IS APPLICATION HHV OR NHV?
BEST REGARDS
TONE

dear sir
-in gas chromatography detection limit express in g carbon or other in second:HOW TO CONVERT FOR EXAMPLE 2 x 10-12 g/sec (LOWER DETECTION LIMIT)for FID DETECTOR TO ppm mol or mol HYDROCARBON?
best regards
tone

a)If 7.31 moles of Ethane(C2H6) undergoes combustion according to the unbalanced equation C2H6+O2->CO2+H20, how much oxygen is required? Answer in units of mol.

b)How much CO2 is formed? Answer in units of mol.

c)How much H2O is formed? answer in units of mol.

The equilibrium constant for the following reaction at 450 K, S (s) + O2 (g) = SO2 (g), is
found 4.2 x 1052.
(1) Write the equilibrium constant expression.
(2) What is Kp for the reaction?
(3) Since the reaction is much product favoured, why can a pile of yellow sulphur exist in the
environment?


I need to answer #( 3). please

18 g glucose, C6 Hl2O6 (Molar mass = 180 g mol) is dissolved in 1 kg of water in a sauce pan. At
temperature will this solution boil (kb for water = 0.52K kg mol
-1
B.P of pure water = 373.1 K)

why electron in shells do not repel each other , while revolving around the nucleus

How much work is done by the system when
2.00 moles of O2 expand from a volume of
3.00 liters to a volume of 6.9 liters against a
constant external pressure of 0.0100 atm?
Answer in units of J

A 20.0L gas cylinder is filled with 8.60moles of gas. The tank is stored at 45∘C . What is the pressure in the tank?
Express your answer to three significant figures and include the appropriate units.

What is the difference between the carbon-oxygen bond in your model of methanol and the one in carbon dioxide

A sample of chlorine gas has a volume of 0.33L at 273 K and 1 atm pressure. To decrease the volume to 0.21L ?