Question

32) The reaction of one mole of nitrogen gas with three moles of hydrogen gas releases 92 ) thermal energy to the surroundings. Which of the following is TRUE? A) This reaction has a negative enthalpy of reaction. B) Complete reaction of two moles of nitrogen gas would release 184 kl of thermal energy this reaction. C) This reaction is exothermic. D) All of the above are true. E) None of the above are true. 33) How many grams of the excess reactant remain assuming the reaction goes to completion and that you start with 15.5 g of Na2S and 12.1 g CuSO4? Reaction: Na2S+CuSO4-Na2SO4 +Cus A) 0.05 B) 5.92 C) 15.45 D) 9.58 E) not enough information 34) What is the complete ionic equation for the reaction of hydrochloric acid with potassium hydroxide? A) H +OH + H20 B) H+ Cl +K++OH- 2H*+02--K+Cl- C) 2H* -201-+K2+ 20H-H20+K2+ 20- D) H++C +K+OH H 2O+K++C1- E) none of the above 35) What are the coefficients for the following reaction when it is properly balanced? _Na3PO4+_Ba(NO3)2- _NaNO3 + _Ba3(PO4)2 A) 2,3,6,1 B) 2, 1, 1,3 C) 6,1,3,2 D) 2, 3, 1,6 E) none of the above

Answer 1

32. D) All of the above are true

33. D) 9.58 grams

34. A) H⁺_(aq) + OH^-_(aq) --------> H₂O_(l)

35. A) 2,3,6,1
32 Malar mass of Na2S = 78.045 g/mol Molarmass of Casoy = 159.609 g Na2SO4 + cus Na2S + (1 mole) (58-0459)_ According Cusou (1 mole) (159.6099). to balanced chemical equation.

159.609 g CusOy require + 78.045 9. Naz S 14- Cusoy require S 78.0459_NQzS 159.609 | 12:1 g- Cees om vrequire a 78.045 X 12.1_9 159.609 + 5.9.166, But amount of Nazs available = 15.5 g excess mass of 5.9166 Na2S = 15.59 _9:58g keelaq) + H2O(0) 34. - He caq) Net ionic + KOH laq) - equation is. A) __HT_fars + oHaes - H2O_6 35: _._2 Na3P0y_+ 3 Ba(NO3), + 6 NaNO3 + 1 Ba3PO4), A) 2,3,6,1.