What are ΔE, q, w and ΔH for
the evaporation of 10.3 g of Br2(l) at 298 K
and 1 atm? (See Thermodynamic Properties.)
Determine ΔH, q, w, and ΔE at
298 K and 1 atm pressure for the reaction of 9.340 g of
NH3(g) with excess HCl(g) to produce
NH4Cl(s). (See Thermodynamic Properties.)
Please use the mass of H at 1.0079 and the mass of N as 14.007. Use
the values in the Thermodynamic Properties to determine the
expected number of significant figures.
Please use the values in the Thermodynamic Properties to determine the expected number of significant figures.
Question 1.
What are ΔE, q, w and ΔH for the evaporation of 10.3 g of Br2(l) at 298 K and 1 atm? (See Thermodynamic Properties.)
dHvap = 30.91 kJ/mol
mol of Br2 = mass/MW = 10.3/159.808 = 0.06445 mol of Br2
H = n*dVap = 0.06445*30.91 = 1.99214 kJ
Q = H = 1.99214 kJ
P = 1 atm = 10325
Vf = form ideal gas, Vi = density
D = 3.1028 g/mL --> V = mass/D = 10.3/3.1028 = 3.319582 cm3 = 3.319582e-6*10^-6 m3
PV = nRT
V = nRT/P = (0.06445 *8.314)(298)/101325 = 0.0015759 m3
W = -P*(Vf-Vi) = -101325*(0.0015759- 3.319582*10^-6) = -159.34171J
dE = Q-W = 1.99214 *10^3 + 159.34171 = 2151.48171 J = 2.15 kJ
What are ΔE, q, w and ΔH for the evaporation of 10.3 g of Br2(l) at...
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