56 of sT > A calormeter contins 26.0 ml of wator at 11.5 C. When 1 30 g of X (a

Question

56 of sT > A calormeter contins 26.0 ml of wator at 11.5 C. When 1 30 g of X (a substance with a molar maos of 44.0 g/mol ) is added,il dssoves via te and the tempenature of the solution increases to 28.0 c Caladatethe erthalpychange_aH·for his rea ton per mole of X Assume that the spedific heat of the rosulting solution is equal to that of war 4.18.J /(g- C)L that density of water is 1.00 g/mL, and that no heat is lst to the calorimeter itsell, nor to the surroundings Express the change in enthalpy in killojoules per mole to three significant figures View Available Hints) /mol Submit Part B Consider the reaction in which 100 g of sucrose, Cs2H01, was bumed i cullnOn(a) + 120, (e)12CO, (g)+11,00% n a bomb calorimeter with a heat capacity of 7.50 kJ C. The temperature increase inside the Calculate the change in intemal enegy enerW E' sor ts reaction per mole of snose calorimeter was found to be 22.0 C Express the change in internal energy in kilojoules per mole to three significant figures View Availiable Hintis) kJ/mol WDECELLLCE

Explanation / Answer

Volume of water= 26ml. density of water= 1 g/ml, mass of water= volume* density= 26ml*1g/ml= 26 gm

mass of total solution = 26 gm+1.3 gm= 27.3 gm

since there is an increase in temperature, enthalpy chang is -ve and

enthalpy change= mass* specific heat* change in temperature =27.3*4.184*(28-11.5) joules=1885 joules

molar mass of X= 40 g/mole, moles of X = mass/molar mass= 1.3/44= 0.0295

Enthalpy change = 1885/0.0295 J/mole =63800 J/mole= 63.8 Kj/mole

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