Experiment 14 Advance Study Assignment: Heat Effects and Calorimetry 1. A metal

Question

Experiment 14 Advance Study Assignment: Heat Effects and Calorimetry 1. A metal sample weighing 147.90 g and at a temperature of 99.5 °C was placed in 49.73 g of water in a calo- rimeter at 23.00. At equilibrium the temperature of the water and metal was 41.8 a. what was for the water? ar r-r,ii") b. what was , for the metal? eC c. How much heat flowed into the water? (Take the specific heat of the water to be 4.18 J/g'C) joules d. Calculate the specific heat of the metal, using Equation 3 joules/g C e. What is the approximate molar mass of the metal? (Use Eq. 4.) ghol 2, when 498 g of NaOH was dissolved in 4972 g of water in a calorimeter at 237"C, the temperature of the solution went up to 50.1'C Is this dissolution reaction exothermic? why? h Calculate sing Equation 1 joules Find /t for the reaction as it occurred in the calorimeter (E-5). c. joules

Explanation / Answer

Q1

a)

dT = (Tfinal - Tinitial) = 41.8 - 23 = 18.8 °C

b)

dT for metal = (Tf-Ti) = 41.8-99.5 = -57.7 °C

c)

Heat flow into water

Q =m*C*(dT

Q = 49.73*4.18*18.8

Q = 3907.98 J

d)

Cp metal

Qmetal = -Qwater = -3907.9 J

Qmetal = m*C*dT

-3907.9 = 147.90*Cpmetal * (-57.7 )

Cpmetal = -3907.9/(147.90*-57.7 )

Cpmetal = 0.45793 J/gC

e)

molar mass will be --> Iron has CP = 0.445 approx, so Fe = MW = 55.8 g/mol approx

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