6. The value of state function depends only on the present state of the system,

Question

6. The value of state function depends only on the present state of the system, not on the path the system took to reach that state. Which of the following quantities are state functions? Enthalpy (H) Displacement Heat () Altitude Work (w) A. heat and work B. heat, altitude and enthalpy C. altitude, enthalpy and displacement D. work and displacement E. heat, altitude, enthalpy and displacement 7. Which one of following is no true? Titration can be performed when the reaction: A. takes place very fast B. has means to detect end point C. is stoichiometric and clean D. is acid/base reaction but not oxidation/'reduction or precipitation reaction E. takes place in non-aqueous medium Concentrated HCl solution, 12.0 M, is available on the shelf. In making 500 ml, 0.12 M HCl solution, which of the following statement is not correct? 8. A. 5.00 mL of 12.0 M HCI solution is required B. must have a 500 mL volumetric flask C. add 5.00 mL of 12.0 M HCI solution to 495.00 ml, water and mix well D. solution must be mixed well before the last small portion of water is added if the meniscus passes the 500 mL line while adding water, you must restart the whole process E. Show details of your work including correct number of significant figures for full credit. One line answers will be given a ZERO grade even if the answer is the correct one. 9. Write the corresponding theormochemical equation and indicate amount and direction of heat transfer (exothermic or endothermic). A. Enthalpy of formation of Cas(PO)h is-4132 kJ/mol -4132125,mol B. Enthalpy of combustion of ethanol, CHsCH:OH, is-1300 kJ/mol

Explanation / Answer

6. state function are enthalpy, displacement and altitude.

so answer is C

7. titration is a slow process so that we can observe tha changes.

so option A is not true. answer is A

8. moles of HCl sholud be equal in both solution so Molarity * volume should be equal

so 0.12 * 500 = 12 * Vol

so volume of intial solution required is 5 ml.and we can add water as we want like slow or fast process so only option which is wrong is E.

answer is E.

9. (A) 3 Ca + 1/2 P4 + 4 O2 ---> Ca3(PO4)2

enthalpy is negative so this is exothermic reaction . (i.e. heat is released.)

(B) C2H5OH + 3O2 ------> 2 CO2 + 3 H2O

enthalpy is negative so this is exothermic reaction . (i.e. heat is released.)

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