45.0 14) Caleulate the work energy, w, gained or lost by the sytmwhen a s consta

Question

45.0 14) Caleulate the work energy, w, gained or lost by the sytmwhen a s constant extemal pressore of 1.3 am +5.3 b. +3.0N 5.3 g of2aCi i disolved in enough water to give otal volume of s00, wht is the molarity of oe a 0.217 M b. 1.33 M e 0.0179 M solution? 0.849 M 0.0717M 16) Give the complete lonic equation for the reaction (if amy) that occurs when aqueous solutions of lithium sulfide and copper (ID) nitrate are mixed e No reaction occurs Determine the oxidizing agent in the following reaction. d. Ni(s) owidation-reduction e. This is not an oxidation-reduction reaction 18) How much heat is absorbed when 45.00 g of Cls) reacts in the presence of excess SO2 (e) to produce CS20) and COgj according to the following chemical equation? a. 2158 k b. 239.9 c. 898.5 kJ d. 179.8 k Energy that is associated with the relative positions of electrons and nuclei in atoms and molecules is called a gravitational energy b. thermal energy c. chemical energy d. kinetic energy r a process at constant pressure, 49,600 calories of heat are released. This quantity of heat is equivalent to cal 4.18J a b. +1.19×104 J. 1.24 × 104 J.

Explanation / Answer

14)

W = -Pext(Vf-Vi)

P = 1.5atm

Vi = 15.0 L

Vf = 35.0 L

put values in above expression

W = -Pext(Vf-Vi)

W = -1.5atm (35.0L - 15.0L)

W = -30.0 atm.L

W = -30.0 *101.4 J

W = -3040 J

W = -3.0 KJ

Answer: d

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