Heat Effects and Calorimetric Mass of beaker plus solid 34.7g Mass of water,mH_2

Question

Heat Effects and Calorimetric Mass of beaker plus solid 34.7g Mass of water,mH_2O 47.6g Mass of solid. m3 6.0g Original temperature 22.7 degree C Final temperature 38.9 degree C 2H2O for the reaction (Eq. 1) (S.H. = 4.18 J/g degree C) joules Delta H for the reaction (Eq. 5) joules The quantity you have just calculated is approximately* equal to the heat of solution of your sample. Calculate the heat of solution per gram of solid sample. Delta H solution = joules/g The solution reaction is endothermic exothermic. (Underline correct answer.) Give your reasoning. solid unknown no. Formula of compound used (if furnished) Molar mass g Heat of solution per mole of compound KJ

Explanation / Answer

Rise in temperature = 38.9 - 22.7 = 16.2 OC.

delta H = Heat gained by water = mass of water x specific heat of water x rire in temp

= 47.6 x 4.18 x 16.2 = 3223.28 Joules

Heat of solution per gram = delta H / mass of solid = 3223.28 Joules/ 6.0 g = 537.21 Joules/ g

The reaction is exothermic, because heat is released as there is a rise in temperature.

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