a. CHCHOH(1) + 3 Odg) 2 CO2(g) + 3 H2O(g) b. H2CO3(aq) + 2 LiOH(aq) Li2CO3(aq) +

Question

a. CHCHOH(1) + 3 Odg) 2 CO2(g) + 3 H2O(g) b. H2CO3(aq) + 2 LiOH(aq) Li2CO3(aq) + 2 H2O(1) c. 2 HCl(aq) + CaCO3(s) CaCl2(aq) + H2O(l) + CO2(g) d. FeBr3(aq) + 3 NaOH(aq) Fe(OH)3(s) + 3 NaBr(aq) e. None of the Above 13. A 250.0 g block of nickel metal (C 0.440 J/g°C) is heated to 216 °C, then dropped into a beaker containing 400.0 g of an unknown liquid at 10.0°C. If the final temperature is 30.6 °C, identify the liquid using its specific heat capacity. a. phenol (1.43 J/goC) b. chloroform (1.05 J/g°C) c. benzene (1.80 J/g C) d. methanol (2.47 J/g C) e. acetone (2.15 J/g C) 14. Calculate Hrxn for the following reaction:

Explanation / Answer

m(unknown) = 400.0 g
T(unknown) = 10.0 oC
C(unknown) = to be calculated

T(nickel) = 216.0 oC
C(nickel) = 0.44 J/goC
T = 30.6 oC
We will be using heat conservation equation

use:
heat lost by nickel = heat gained by unknown
m(nickel)*C(nickel)*(T(nickel)-T) = m(unknown)*C(unknown)*(T-T(unknown))
250.0*0.44*(216.0-30.6) = 400.0*C(unknown)*(30.6-10.0)
C(unknown)= 2.47 J/goC
Answer: d

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