SBlution-Beot evolvedl or 07 a abstone dissolves cor) Pere d vohen one mole 2. A

Question

SBlution-Beot evolvedl or 07 a abstone dissolves cor) Pere d vohen one mole 2. A piece of metal weighing 10.0 g is heated to raise its temperature from 25 It is found that the metal absorbed 47.6 cal of heat in the process. .0 °C to 76.5 C a. Calculate the specific heat of the metal. Include appropriate units 4 7.weal -e -0092elcal/9 1.oca . Based on your results, identify the metal from the list below. Metal- Element Aluminum Copper Iron Silver Specific heat (cal/g.°C) 0.216 0.093 0.107 0.057 A 5.0 g sample of an ionic compound (MW-96.5 g/mol) is placed in 50.0 g of water at C and the solution is stirred. When the salt is completely dissolved, the temperature of solution is 32.7 °C. g) Is the heat of solution endothermic or exothermic? Ihn colution is 1.0 cal/g C, calculate the

Explanation / Answer

Q2)

a) Heat absorbed = mass * specific heat capacity * change in Temperature

47.6Cal = 10g * specific heat capacity * (76.5 - 25)

specific heat capacity = 0.09242 Cal/gC

b) Since the answer of specific heat capacity is closest to Copper value (0.093 Cal/gC), hence the metal must be Copper

Q5)

a) Since the temperature of water has risen from 25C to 32.7C, hence the heat is given to the solution, so the reaction is exothermic in nature

Therefore, heat of solution is exothermic

b) Specific heat of solution = 1 Cal/gC

Heat released by addition = mass * specific heat capacity * change in temperature

=> 50g * 1 Cal/gC * (32.7-25)

=> 385 Cal

Number of moles of solute = 5/96.5 = 0.051813 moles

Delta H solution of this compound = 385 Cal/0.051813mol = 7430.5 Cal/mol = 7.4305 KCal/mol

Delta H solution in Kcal/g = 7.4305/96.5 = 0.077 Kcal/g

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