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The substance X is an element which has the elemental form of X(s) at 25oC. The standard enthalpy of formation of HXO4(g) is -893.6 kJ/mol at 25oC. The standard entropy of HXO4 (g) and X(s) are, respectively 152.7 J/mol•K and 22.10 J/(mol•K) at 25oC. What is the standard free energy change (kJ) for the following reaction at 499.0 K ? [Note: Answer should be expressed as "xxx.x", or with one sig fig after the decimal point.]
2 HXO4(g) + 7 H2(g) ? 2 X(s) + 8 H2O(g)
Calculate the work associated with the compression of a gas from 121.0 L to 80.0L at a constant pressure
What is the ph of the solution obtained by mixing 30.00mL of 0.250 M HCl and 30.00 mL of 0.125 M NaOH?
Offer a brief explanation of why bandgaps for octet p-block semiconductors (1) decrease with increasing average principal quantum number
A 4.82-L sample of carbon monoxide is collected at 55°C and 0.833 atm. What volume will the gas occupy at 1.05 atm and 25°C?
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Consider the following reactions carried out at a constant temperature and pressure. In which of these will the amount of work done be positive, only the coefficients of the reactants are given. All species are gas unless otherwise noted.
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To what general class of mechanisms does the attack of bromide ion, Br-, on the cyclic bromonium ion
Consider a distillation column that is fed 1000 kg/hr of an equimolar mixture of benzene and cyclohexane. Theof the benzene distillate stream is to contain 90 % with a benzene mole fraction of 0.95.
What is the molarity (M) of the concentrated HClO4 solution?
Alpha terpene, C10H16, is a pleasant-smelling hydrocarbon that has been isolated from oil of marjoram. On hydrogenation over a palladium catalyst, alpha terpene reacts with two molar equivalents of H2 to yield a hydrocarbon C10H20
The pka of the amino group is 9.20. Calculate the pI for tyrosine. At what pH is the side chain of tyrosine 1/4 ionized?
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