Pad 4:45 AM 91% session.masteringchemistry.com Exercise 10 Mastering Chemistry A
ID: 547680 • Letter: P
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Pad 4:45 AM 91% session.masteringchemistry.com Exercise 10 Mastering Chemistry A sample of Na2SO4(s) is dissolved in 225 g of water at 298 K such that the solution is 0.325 molar in Na2SO04.A temperature rise of 0.146 C is observed. The calorimeter constant is 330.J K-.the density of the solution can be approximated to be the density of pure water 1.00 g/mL Part A Calculate the enthalpy of solution of Na2S0 in water at this concentration Express your answer to three significant figures and include the appropriate units. H 1 alue Units solution.m - ABC 123+HA q W e r y u o p Submit Give U Incorrect; Try Again; 10 attempts remaining Part B Calculate the enthalpy of solution using the data in Table 4.1 in the textbook (Appendix B, Data Tables)Explanation / Answer
a)
Na2SO4 enthalpy
Qsolution = qwater + qcal
Qsoln = m*C*(Tf-Ti) + Ccal(Tf-Ti)
Qsoln = 225*4.184*(0.146) + 330*0.146 = 185.6244 J absorbeed
QNaSO4= -Qsoln
Q = -185.6244 J
mol of NaSO$ = MV = 0.325*0.225 = 0.073125
HRxn = Q/n = -185.6244 / (0.073125) = -2538.45 J/mol
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