Question

please help me with these three questions!

q1. In the coffee cup calorimeter , 0.853 g of MgO were added to 71.4 ml of diluted aqueous hydrochloric acid. If temperature is increased by 5.9 degrees C, wht is q(rxn) in (KJ)? assume that q (cal) is small enough to be negligible. the specific heat capacity of the solution is similar to water (c=4.184), and the density of dilute hydrochloric acid solution is 1.00 g/ml.

q2.explain how the signs of q(rxn) and initial and final temperature are related to wether a reaction is exothromic or endo thromic?

q2. two seprate coffee cup calorimetric expriment are conducted. one expriment has the calorimeter and all the reagents at room temperature and other has calorimeter and all the reagents at higher temperature. all other experimental conditions are held constant

i) provide one thermochemical values that would be different between the two trials other than T(initial).

ii) provide one thermochemical values that would be consistent between two trails.

Answer 1

0 ☆ Myo = 0.853 gm (Males Mago 0.853 gm 40 g/mol Il 0.0 3995 * Mgo Ho Mg Colla Malohida tahl + 2 Holoces My clacant (Neutralization reaction ) - fron ? ใน mx 5X AT 11 gained by Solution → change in temperature. Specific heat m solution Mars Volume x density gm х 71.4 ml 71.4 gm I gained by solution - 71.4 g x 4.1-84 J x 5.9 'c joc 1769.55 1845 neutralization, In acid /base reaction or heat is always released qoxana -ve (for heat released Exothermies * Hest released when 1769.55184J 021395 mole of Mg Colla reacted Heat released when 1 mole of Mgrott be reacted = 1762.55184 I 0.021325`mol = 89,651.90 J 9rxn 11 -89.6519 kJ
of
2 2 ② As reaction is exothermic, heat will be released and that heat will be gained by Solution. increase. Temperature of Solution final temperature will be higher than initial temperatures رازی (1) The neutralization reactions are exothermic. Shifts towards backward Exothermic reaction direction. Pron will decrease. hence. arxn in kJ will moj be diffrent for these two experiment. Consistent for 302) Specific heat lepacity will be these 9 312acte experiment