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Physical Chemistry
Succinc acid has the formula (CH2)n(COOH)2 and reacts with dilute sodium hydroxide as follows:
(CH2)n(COOH)2 +2NaOH = (CH2)n(COONa)2 + 2H2O.
2.0 grams of succinic acid were dissolved in water and the solution made up to 250 cm3. This solution was placed in a burette and 18.4 cm3 was required to nuetrilse 25 cm3 of 0.1 mol/dm3 of NaOH. Deduce the molecular formula of the acid and hence the value of n.
(CH2)n(COOH)2 +2NaOH = (CH2)n(COONa)2 + 2H2O.
2.0 grams of succinic acid were dissolved in water and the solution made up to 250 cm3. This solution was placed in a burette and 18.4 cm3 was required to nuetrilse 25 cm3 of 0.1 mol/dm3 of NaOH. Deduce the molecular formula of the acid and hence the value of n.
Physical Chemistry
Explain why gas does not explode immediately but explodes after a delay?
If the LEL for hydrogen = 4% and the UEL = 74% what mass of hydrogen was contained in the tin when it exploded? (conditions at the time of the experiment were 23oC and 750 mmHg)
If the LEL for hydrogen = 4% and the UEL = 74% what mass of hydrogen was contained in the tin when it exploded? (conditions at the time of the experiment were 23oC and 750 mmHg)
Physical Chemistry
Calculate Ho for the combustion of butane gas (C4H10), to produce gaseous carbon dioxide and liquid water:
2C4H10 (g) + 13O2(g)->8CO2(g) + 10H2O (l)
a. Calculate the standard enthalpy change, Ho
for the reaction.
2C4H10 (g) + 13O2(g)->8CO2(g) + 10H2O (l)
a. Calculate the standard enthalpy change, Ho
for the reaction.
Physical Chemistry
A quantity of electric charge brings about the decomposition of 4.5 g Al from Al+3 at the cathode. How much volume (STP) of H2(g) from H+ at the cathode will be produced using the same quantity of electric charge?
Physical Chemistry
Please tell me , Why rate constant of second order reaction is independent of time
Physical Chemistry
There are two cylinders containing methane gas and Nitrogen dioxide gas.
The volume of these two cylinders re 500cm3 and 700 cm 3 respectively.
Calculate the number of moles of each gas and the total number of mole of the gaseous mixture when the two cylinders are connected together.
The volume of these two cylinders re 500cm3 and 700 cm 3 respectively.
Calculate the number of moles of each gas and the total number of mole of the gaseous mixture when the two cylinders are connected together.
Physical Chemistry
describe briefly a suitable laboratory procedure for separating a mixture of NaCl, NH4Cl and PbCl2
Physical Chemistry
on dissolving 19.5 g of CH2FCOOH IN 500 g of water a depression of 1c in freezing point of water is observed calculate vant hoff factor and dissociation constant of fluro acetic acid given kf=1,86 Kkg mol-1
Physical Chemistry
What is the density (in g/mL) of a 3.60 M sulphuric acid solution that is 29% H2SO4 (Molar mass = 98 g/mol) by mass ? Please explain.
Physical Chemistry
The vapour pressure of ethanol and methanol are 42.0 mm Hg and 88.5 mm Hg respectively. An ideal solution is formed at the same temperature by mixing 46.0 g of ethanol with 16.0 g of methanol. What is the mole fraction of methanol in the vapour? Please explain how.
