Question

Question Completion Status: QUESTION 6 1 points Save Anower The heat energy lost by an exothermic reaction is characterized as a negative change of enthalpy of the reaction (Arr. Heat energy is measured in joules while the closely related change in enthalpy is measured in kilojoules/mole accounting for the amount of heat produced by each molecule. If 485) of heat (a) is produced by a gven reaction of 0.032 moles of a given reactant, what is the molar enthalpy change (Hra relative to that reactant in kmal? Enter the numerical answer in decimal format, do not include units. QUESTION 1 points She Answer Probably one of the most needlessly confusing issues in chemistry is the minily discussed difference in the standard temperature and pressure (STP) used for gas law calculations and the standard states wich are considered the reference states in thermodynamic calculations. The confusion mainly has to do with temperature. SIP: standard temperature and pressure of 'C and 1 atm at which 1 mol of an ideal gas occupies 22.4L. Standard State (for a reaction each solid is a pure solid, each liquid is a pureud, cach gas is at 1 atm of pressure, gach dissolved substance is at 1M concentration, the standard enthalpy of formation, for each comer in its standard state is defined to be zero and the standard free energy of formation, *y of each element in its standard state is defined to be zero. Typically these values are tabulated at 25 C but they can be culated at any other temperature. Which of the following would be considered at STP, standard state or both? vagas at 1am pressure and 298.15 K temperature A both w a pure solid under 1 atm pressure and 323 K temperature B. neither al M solution under 1 m pressure and 273.15K C.STP wa 1M solution under 1 at pressure and 298.15K D. standard state

Answer 1

q= 2 485 J for 0.0 32 mol 485 loro -Jk5/0.032 mal Ahown in kJ/mol = 15.16 kJ/mol Ans. is 15 16 25°C 2 298.15k, tahm Standard stare o'c 2 273.15k, I ahm STP. gan Lah standard Stake Lahm pressme, 298.15 k temperath so pure solid under Lahn pressure, 323k z ② neither. a 1 mal solution under sahm & 27315) STP ② pressume an K 2 & LMO solution enau tahm proses ons 298.15h =) Standare stare.