Question
please help ASAP
One mole of ____ contains the least number of atoms. A) S_8 B)CH_4 C)Al_2(SO_4)_3 D)Na_3PO_4 E) C_6H_14 Which of these compounds is a weak electrolyte? A) NaCl B) HNO_3 C) C_6H_12O_6 (glucose) D) CH_3COOH (acetic acid) E) H_2SO_4 For the reaction shown below, which of the following is a conjugate acid-base pair? C_5H_5N(aq) + H_20(l) C_5H_5NH^+(aq) + OH^-(aq) A) C_5H_5N. H_2O B) C_5H_5N, C_5H_5N C) C_5H_5NH^+, OH^- D) H_2O. C^5H_5NH^+ E) H_2O, OH^- The reaction shown below is at equilibrium. Use lessthanorequalto Chatelier's principle to predict the effect of reducing nitrogen gas to the equilibrium reaction mixture. N2(g) + 3H_2(g) 2NH_3(g) A) The equilibrium position will remain unchanged. B) The equilibrium position will shift to the side of products. C) The equilibrium position will shift to the side of reactants. D) The equilibrium constant will increase. E) The equilibrium constant will decrease. Which of the following is a process with a negative Delta S? A) H_2O(l) rightarrow H_2(g) B) H_2O(s) rightarrow H_2(l) C) H_2O(l) rightarrow H_2(s) D) CO_2(s) rightarrow CO_2(g) E) CaCO_3(s) rightarrow CaO(s) + CO_2(g)
Explanation / Answer
1 . 1 mole S8 = 8 moles of S atom
1 mole CH4 ----> 1 mole C + 4 mole H ----> 5 moles of atom
1 mole Al2(SO4)3 -----> 2 mole Al3+ + 3 mole SO43- -----> 5 moles of atom
1 mole Na3PO4 ----> 3 mole Na+ + 1 mole PO43- -------> 4 moles of atom
1 mole C6H14 -----> 6 mole C + 14 mole H -----> 20 moles of atom
So Na3PO4 contains least number of atoms that is 4,
Therefore option (D) is correct.
