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Elements of the periodic table

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Verified questions

CHEMISTRY

State whether the entropy of the system increases or decreases in each of the following processes: (a) Gasoline burns in a car engine. (b) Gold is extracted and purified from its ore. (c) Ethanol (CH3CH2OH) dissolves in 1-propanol (CH3CH2CH2OH).

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CHEMISTRY

A mixture of 0.47 mole of H2 and 3.59 moles of HCl is heated to 2800 degree C. Calculate the equilibrium partial pressures of H2, Cl2, and HCl if the total pressure is 2.00 atm. For the reaction H2 (g) + Cl2 (g) <=> 2 HCl (g) Kp is 193 at 2800 degree C.

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CHEMISTRY

The electron affinity of sodium is lower than that of lithium, while the electron affinity of chlorine is higher than that of fluorine. Suggest an explanation for this observation.

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CHEMISTRY

The $$ pK_a $$ of acetamide $$ \left( \mathrm { CH } _ { 3 } \mathrm { CONH } _ { 2 } \right) $$ is 16. Draw the structure for its conjugate base and explain why acetamide is less acidic than $$ \mathrm { CH } _ { 3 } \mathrm { COOH }. $$

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