Lone Star CHEM 14 411 Esam Fall 2017 36. What is the quantity of heat evolved at

Question

Lone Star CHEM 14 411 Esam Fall 2017 36. What is the quantity of heat evolved at constant prossure when combustion of H) and OAg 62.2 1 is formed Gros the A) 1.21 10 B) 1.78x 10*k C) 9,87x10U D) 285.8 kJ E) 82.8 k roaction of iroa with bydrochloric acid is repeesented boy the tollowling thermewhemicn equation If, in a partieular experiment, 6.84 kJ of heat was released at constant peessure, what volurne of Hte), measured at STP, was produced? (R-0.0821 L aun/(K·mol)) A) 1.74 L B) 22.41 C) 1.90 D) 3.14 x10 L E) 2.88 x 10 L 38. Which anion will foem a peecipitate with Ba2*? B) Br c) so2 D) CT E) none of the above K7 B) 64: 32 32 : 64 E) 1:2

Explanation / Answer

Q36

heat evolved when,

m = 62.2 g of H2O form

mol = mass/MW = 62.2/18 = 3.455

the reactino is based per 1 mol of H2O

so

Q = n*HRXN = 3.45*(-285.8) = -986.01 kJ will evolve

choose C

Q378

ratio --> 6.84 kJ /87.9 kJ/mol of H2 = 0.0778 mol of H2

mol of H2 = 0.0778

1 mol = 22.4L

0.0778 mol -- 0.0778*22.4

V = 1.74272 L

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