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How is Gibbs free energy change determined when ΔH and ΔS are available?

ΔG = ΔH - TΔS


Ozone (O3) in the atmosphere can react with nitric oxide (NO):

O3(g) + NO(g) > NO2(g) + O2(g)


Calculate the G for this reaction at 25°C.

(H = -199 kJ/mol, S = -4.1 J/K•mol)


find the length of the arc of the curve 9y2= (x2+2)3 from the point where x=0 To the point where x = 2.


Determine S for the reaction:


SO3(g) + H2O(I) > H2SO4(I)


Given: S° (J/K•mol): 256.2 69.9 156.9


A school principal claims that more than 67% of the 700 students of their school prefer printed modules. Test the hypothesis using 95% level of confidence.


Convert (3–√,−1) into polar coordinates (r,θ) so that r≥0 and 0≤θ<2π.


Write z1=3–√+i and z2=1−i in trigonometric form. Then the argument of the quotient z1z2is given by


The market structure that involves the most competition:

A.monopolistic competition

B.perfect competition

C.oligopoly

D.pure monopoly





The equilibrium constant K, for the oxidation of sulfur dioxide into sulfur trioxide is 5.6x10¹ at 350°C. If the equilibrium partial pressures of SO, and SO, are 0.64 atm and 0.58 atm, respectively, what is the partial pressure of O, in the system?


2SO2(g) + O2(g) 250,(g)

If the acceleration of an object is zero and. Its velocity is non zero what can you say about the motion of an object

The volume of hydrogen sulphide it stp when 1.5g of sodium hydroxide react with hydrogen sulphide.


(NA=23,H=1,S=32,O=16)



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