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catalytic regenerative reformer (Benzene, C6H6 – 17%; Toluene, C6H5CH3 – 39%; Xylene,
(CH3)2C6H4 – 44%
ΔHf C6H6(l) = 49.03 kJ/mol
ΔHf CO2(g) = -393.5 kJ/mol
ΔHf C6H5CH3(l) = 12.0 kJ/mol
ΔHf H2O(l) = -285.8 kJ/mol
ΔHf (CH3)2C6H4(l) = -24.4 kJ/mol
Student X titrated 25.0cm
3 of 0.1M K2CO3 with 0.1M HCl, using methyl orange as indicator. Student Y carried out the same exercise but used phenolphthalein as indicator.Which of the following statements about the titrations is true?
A.The titre values obtained from the two titrations are equal
B.The titre value for the titration by X is twice that by Y
C.The titre value for the titration by X is half that by Y
D.CO2(g) was released in the reactions in both titrations
).Given a 0.1M aqueous solution each of NH4Cl and CH3COONa (ammonium ethanoate),state and explain which of them you would expect to have a lower pH
When using enzymes an assay buffer is needed to stabilize the pH throughout the reaction. Is there a specified ratio/amount of enzyme to buffer?
