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25cm3 of 0.018 of potassium permanganate is pipetted into a conical flask,some dilute sulphuric acid and excess potassium iodide are then added and the liberated iodine is titrated in sodium thiosulphate of unknown concentration ,
Average titration figure is 15.6 cm3
a)write the equation for the two reactions hence find the mole ratio
b)calculate the concentration of sodium thiosulphate in moles per litre
pressure of 1 atm to a pressure of 0.1 atm. What is the change in Gibbs free energy?�
calculate enthalpy for ethanonl combustion using bond enthalpy calculations
A CaCO3-MgCO3 solid solution contains 3 weight percentage Mg. What is the mole fraction of MgCO3 in the solid?
MnO (catalyst)
2KCIO, --> 2KCI + 30₂
Given the total volume of oxygen gas released is 37cm3 what is the number of moles of gas of oxygen?
What current will deposit 3.25grams of zinc for 2 hours
A.2
B.1
C. 6.022 x 10 raise to power 23
D. 12.044 x 10 raise to power 23
600 mg of gas X occupies 400 cm3 of volume. Calculate the molecular weight in grams.
The lattice energy of MgO is greater than that of MgS because
A. MgO is ionic while MgS is covalent
B. MgO is solid while MgS is gas
C. The charge density of S is greater than that of O
D. The O2- ion is smaller than the S2- ion
Which of the following substances has ions in its bonding model?
A. Copper
B. Carbon dioxide
C. Copper oxide
D. Carbon
#339914 on Dec 2023