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Subject: Chemistry, asked on 2/3/21

The boiling point of solution containing 2.62 g of substance A in 100 g of water is higher by
0.05120
C than the boiling point of pure water. The molar mass of substance is ----------.
(Kb
= 5.12 K m-1)
A) 131 g mol-1 B) 262 g mol-1 C) 26.2 g mol-1 D) 2620 g mol-1

Subject: Chemistry, asked on 11/12/20

A gas enclosed in a cylinder is expanded to double its initial volume at a constant pressure of one atmosphere. How much work is done in this process?

Subject: Chemistry, asked on 1/4/21

What is half life of first order reaction if time required to decrease concentration of reactants from 0.8M to
0.2M is 12 hrs

Subject: Chemistry, asked on 13/2/22

Calculate the standard enthalpy of the reaction.
2Fe(s) +
3
2
O2(g) Fe2O3(s)
Given: i) 2Al(s) + Fe2O3(s) 2Fe(s) + Al2O3(s) ?fH? = - 847.6 KJ
ii) 2Al(s) +
3
2
O2(g) Al2O3(s) ?fH? = -1670 KJ

Subject: Chemistry, asked on 28/1/21

The vapour pressure of pure benzene of molar mass 78 gram per mole at a certain temperature is 640 mm HG e a non volatile solute of mass 2.315 gram is added to 49 gram of benzene the vapour pressure of the solution at 600 mm HG what is the molar mass of solute

Subject: Chemistry, asked on 14/2/22

Please help me answer this question..
What is the influence of particle size of reacting solid on rate of a chemical reaction?

Subject: Chemistry, asked on 12/10/22

alpha-chloro propionic acid is more acidic than beta - chloropropanoic acid

Subject: Chemistry, asked on 29/3/21

A ? products, a straight line graph passing through origin is obtained between the rate of reaction against
concentration of A, what would be the order of reaction? Why?

Subject: Chemistry, asked on 1/4/21

Rate constant for the reaction 2N2O5 ? 4NO2 + O2 is 4.98 x 10-4 s -1 Find the order of reaction?

Subject: Chemistry, asked on 2/3/21

What is action of conc. H2
SO4
on sulphur ? Write the reaction

Subject: Chemistry, asked on 25/11/20

Bond enthalpies of H ? H, CI ? CI & H ? Cl bonds are 434 kJ mol?? , 242 kJ mol?? and 431 kJ mol?? respectively. Enthalpy of formation of HCl is???.

Subject: Chemistry, asked on 25/11/20

The quantity of electricity required to deposit 1 mole of copper from copper sulphate solution is???.

Subject: Chemistry, asked on 21/6/21

what is smart reaction

Subject: Chemistry, asked on 31/8/21

for the elementary reaction a + b is equal to see the rate of constant K is equal to 10 raise to minus 6 sem old is minus 1 into SAS -1 write the rate law and calculate the initial rate of a reaction if AC is equal to 0.1 Mol elders -1 and the Bees equal to 0.24 mole elders -1

Subject: Chemistry, asked on 25/11/20

pH of a saturated solution of Ca(OH)? is 9. The solubility product of Ca(OH)? is???

12
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