Question

26. State Hess's law of constant heat of summation. Which is a
good fuel? The standard enthalpy of formation of CH4, C2H6,
CO2 and H20 are -74.8. 84.6, -393.5 and -289 kJ mol-1
respectively.
27. Define the terms:
i. Alkalimetry
ii. Acidity of base
500 mL of X N HCl solution required Y mL of 0.1 N NaOH for
complete neutralization and the resulting mixture yielded
14.625 g of solid NaCl by evaporation. Find X and Y.
28. Explain different steps involved in the extraction of zinc from
its ore
29. Write down the chemistry of blue vitriol.
i want 27 number numerical​

Answer 1

Explanation:

State Hess's law of constant heat of summation. Which is a

good fuel? The standard enthalpy of formation of CH4, C2H6,

CO2 and H20 are -74.8. 84.6, -393.5 and -289 kJ mol-1

respectively.

27. Define the terms:

i. Alkalimetry

ii. Acidity of base

500 mL of X N HCl solution required Y mL of 0.1 N NaOH for

complete neutralization and the resulting mixture yielded

14.625 g of solid NaCl by evaporation. Find X and Y.

28. Explain different steps involved in the extraction of zinc from

its ore

29. Write down the chemistry of blue vitriol.

i want 27 number numerical

Answer 2

Hess's Law of Constant Heat Summation (or just Hess's Law) states that regardless of the multiple stages or steps of a reaction, the total enthalpy change for the reaction is the sum of all changes. This law is a manifestation that enthalpy is a state function.

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