1
answer
0
watching
377
views
18 Nov 2019
Energy that is associated with the position or composition of an object is called a. kinetic energy b. thermal energy c. potential energy d. chemical energy Choose the reaction that illustrates Delta H degree f for NaHCO_3. a. Na(s) + H_2(g) + C(s) + O_2(g) rightarrow NaHCO_3 (s) b. Na^+ (aq) + HCO_3^- (aq) rightarrow NaHCO_3 (s) C. Na^+ (aq) + H_2O (l) + CO_2 (g) rightarrow NaHCO_3(s) d. Na(s) + 1/2 H_2 (g) + C(s) + 3/2 O_2 (g) rightarrow NaHCO_3 (s) e. Na(s) + 2 H(g) + C(s) + 3 O(g) rightarrow NaHCO_3 (s) Use the standard reaction enthalpies given below to determine Delta H degree _rxn for the following reaction: 4SO_2 (g) rightarrow 4 S(s) + 6 O_2 (g) Delta H degree _rxn = ? Given: SO_2 (g) rightarrow S(s) + O_2 (g) Delta H degree _rxn = +296.8 kJ 2 SO_2 (g) + O_2 (g) rightarrow 2 SO_3 (g) Delta H degree _rxn = -197.8 kJ a. -494.6 kJ b. -692.4 kJ c. -791.4 kJ d. 1563 kJ e. -293.0 kJ A piece of iron (mass = 25.0 g) at 398 K is placed in a Styrofoam coffee cup containing 25.0 mL of water at 298 K. Assuming that no heat is lost to the cup or the surroundings, what will the final temperature of the water be? The specific heat capacity of iron = 0.499 J/g degree C and water = 4.18 J/g degree C. a. 348 K b. 308 K c. 287 K d. 325 K e. 388 K
Energy that is associated with the position or composition of an object is called a. kinetic energy b. thermal energy c. potential energy d. chemical energy Choose the reaction that illustrates Delta H degree f for NaHCO_3. a. Na(s) + H_2(g) + C(s) + O_2(g) rightarrow NaHCO_3 (s) b. Na^+ (aq) + HCO_3^- (aq) rightarrow NaHCO_3 (s) C. Na^+ (aq) + H_2O (l) + CO_2 (g) rightarrow NaHCO_3(s) d. Na(s) + 1/2 H_2 (g) + C(s) + 3/2 O_2 (g) rightarrow NaHCO_3 (s) e. Na(s) + 2 H(g) + C(s) + 3 O(g) rightarrow NaHCO_3 (s) Use the standard reaction enthalpies given below to determine Delta H degree _rxn for the following reaction: 4SO_2 (g) rightarrow 4 S(s) + 6 O_2 (g) Delta H degree _rxn = ? Given: SO_2 (g) rightarrow S(s) + O_2 (g) Delta H degree _rxn = +296.8 kJ 2 SO_2 (g) + O_2 (g) rightarrow 2 SO_3 (g) Delta H degree _rxn = -197.8 kJ a. -494.6 kJ b. -692.4 kJ c. -791.4 kJ d. 1563 kJ e. -293.0 kJ A piece of iron (mass = 25.0 g) at 398 K is placed in a Styrofoam coffee cup containing 25.0 mL of water at 298 K. Assuming that no heat is lost to the cup or the surroundings, what will the final temperature of the water be? The specific heat capacity of iron = 0.499 J/g degree C and water = 4.18 J/g degree C. a. 348 K b. 308 K c. 287 K d. 325 K e. 388 K
Collen VonLv2
7 Jan 2019