Question

Experiment 14 Advance Study Assignment: Heat Effects and Calorimetry 1. A metal sample weighing 14790 g and at a temperature of 99.5°C was placed in 49.73 g of water in a calo- rimeter at 23.0 C. At equilibrium the temperature of the water and metal was 41.8°C a. What was As for the water? (Ar- 41.8 23.0 x18.80 18.8 c b. What was Ar for the metal? 99.5-41.8is 57.78 57.7 Voc c. How much heat flowed into the water? (Take the specific heat of the water to be 4.18 JgC.) (43.133) (4.13.)(18.88)3908 3908 joules 54.0 g/mol d. Calculate the specific heat of the metal, using Equation 3. 39083.(17.909) (Cmetail (57.72") Cmetal 3207 0.458 joules/g"C (147.99,057.26 -0.4583) e. What is the approximate molar mass of the metal? (Use Eq. 4.) Mm² 25 J/mol. 6°c 0,458 400 2. When 4.98 g of NaOH was dissolved in 49.72 g of water in a calorimeter at 23.7°C, the temperature of the solution went up to 50.1°C. a. Is this dissolution reaction exothermie? Yes Why? Becauese the tempreture of the solution increased which indicates a release in energy b. Calculate quzo, using Equation 1. +5,49810 19.989 +49.729) (4,185/96) (50.16-23.7.) (54.70g)(4.1870) (26.4") 6036.3 6036.3 joules c. Find AH for the reaction as it occurred in the calorimeter (Eq. 5). 4.488 0.1245mol 40g/mol AH = 49484.34 joules 6036.3 Joules.48484.345 0.1245 ml (continued on following page) custom page 63 - 5,496103

Answer 1

d) for 4.98 g wool dissolved in walec - heat released is J-49x103 100g naon 7 9 heat releated for - c) on (in kg = Ohan molar mass mol mass of woon of Naos used 2 –5-49 Colt 4-988" x 39-99791 mo) - 44.1 kg mol 21-44=1 me not an ona A NOOM NOOH Co caa) ca

Oh non long of natteny ton of art) - Cone of Nao ) = (-240-1 kg = 2300 43) - (-425.6 kg дит |ччя 1 teror 21-44-5 - (-44-17 & 2007. 210.9077 . 44-5