Question

specific heat capacity

2. If 3.8 g of calcium chloride (CaCl2) is dissolved in 100.0 mL of water, the following data are collected: starting temperature is 25.8 °C, final temperature after dissolving is 29.9 °C. Calculate the enthalpy of solution in Joules. You may assume a density of 1.00 g/mL for the solution and you may assume that the specific heat is that of water (this is a dilute solution) and is 4.18 J/(gx°C). Is this an endothermic or exothermic reaction? is 2 perature the

Answer 1

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Here m.cp. AT formula we use Amount of heat seleased/abcorbed oy the kubstamce If q-tVe heat/ enesgy Relaseg (exotrenues Ve hetlenegy mars f Subs tam ce ms p= Speibee heat Capauity of Sukstauce AT Change in tempetalne abcorbed fendo tan : Volume of walr 3.8 8 too omL mass of Cacl Noo, given data mars of water =lo0-01-deustty 1.00 ghnt mass mass of Saluction = (03.89 4-1e39.2) 17 Voume Lm dxv G.o0m) (1o0 mt ioog 1 Cp of colution 4.1c AT Ta-T, a9.9°c-25.8c Nou, (t03.89)(418 3/0-)) (4-1 1778.93 Thes is the heat Aeleased from the solution AH=1778.9T Exothermic Soludion and It is