NJIT Moodle njit2.mrooms.net IST SERVICE DESK FACULTY HELP PAGE STUDENT HELP- b.

Question

NJIT Moodle njit2.mrooms.net IST SERVICE DESK FACULTY HELP PAGE STUDENT HELP- b. below the temperature found in the last question c. because the reaction is endothermic and AS is positive. (n this case AS is more important at higher temperature important.) d. becuase the reaction is exothermic and AS is negative, in this case ?S is iess important at lower temperatures important What is ?? (in kJ) at 15 °C for the pha CH3NO2(l) ? CH3NO2(g) CH3NO20: AH--113.1 kJ/mol and S° 171.8 JK mol) se change of nitromethane from the liquid to the gaseous state? CH3NO2(g): ??!--74.7 kJ/mol and So-274.4 JK mol) Hint given in feedback. Answer: what kind of process it is-reac Find ?? and AS for the phase change. ?G-AH-TAS. In calculating AG it does not matter

Explanation / Answer

?G= ?H - T?S

T= 15 °C = 273+ 15= 288K

?H = ?H f(product)- ?Hf( reactant)

= -74.7-(-113.1)

= 38.4kJ/mol

?S= 274.4 - 171.8

= 102.6 J/ K mol

?G = ?H - T ?S

= 38.4 - 288(102.6)

= - 29510.4 kJ/mol

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