Question

Calculate C for the following reaction. HOCH. 2000) HCL NAOHHO+NACIAH = 57 kimol 100 mL of 1 M HCl and 50 ml of 1 M NaOH were missed in a Styrofoam cup calorimeter What is the system? b. What is the surroundings? c Does the solution get hotter or colder? 3. An endothermic reaction takes place in aqueous solution a. Does the temperature of the solution increase or decrease b. What is the sign of AH? C. Is heat a reactant or a product? 4. Does aH of reaction correspond to heat transferred at constant pressure or constant volume?

Answer 1

The answer of all the questions are as follows

1) The given chemical equation is CHyCq) + 4 CL C g) celyle) + 4Hicg) Alt =-429.7kJ/mol The required chemical equation is 2 ccly (4) + 2 HCl(G) I CHylg) 12 (19) = > Q 4H? egno can be obtained by multiplying ( ² ) in ean 1

ie - хео => cCly (1) + 2HCl(g) -> 5 CH ,19). ..AHg = -4X4H1 5 X-hores = 214.85 KJ/mole ..AH for the asked reaction I is 214.85 kJlmole. The equation is HCl + NaOH - HO + Nach -4H=-57 KJ/mol As per chemistry the neactants under study are the system. Other than the reactants everything is surrounding. : (a) Here system is HCI SNOOH (5) Surrounding are H₂O, Nach, Styrofoam cap calore

(c) since Here Harve, that means the reaction is exothermic. Heat is released by the system. I since heat is released the solution gets hotter. 3) in an endothermic reaction heat is absorbed by the system. (a) Therefore the temperature I of the solution decreases. b) for endothermic reaction AH = positive cove) rc Heat is a form of energy absorbed by the reactant. y 4H of a reaction comespond at to heat transfered constant pressure. where I da- Change AH da on heat dT = change in tem