6) Adding 128 kJ of energy to a beaker of acetone (46.07 g/mol) at its boiling p

Question

6) Adding 128 kJ of energy to a beaker of acetone (46.07 g/mol) at its boiling point will vaporize how many grams of the liquid? (,ap for acetone is 3 1-3 kJ/mol) A) 4.09 g B) 188 g C) 87.0 g D) 11.3 g 7) Metallic atomic solids often behave as A) good conductors of electricity, because they are static cationic cores surrounded by a freely moving "sea" of electrons. B) poor conductors of electricity, because only the electrons can move about freely C) poor heat conductors, because the freely moving electrons absorb the heat energy D) low melting solids, because the freely moving electrons allow the metals atoms to shift position easily 8) The unit cell with the highest packing efficiency is the A) body-centered cubic unit cell B) simple cubic unit cell C) a close packed structure with an AA pattern. D) a close packed structure with an AB pattern. 9) What is the coordination number for a face-centered cubic cell? A) 2 B) 8 C) 12 D) 10 10) Which of the following substances would form miscible pairs? 11. III. CHy-CH2-CH-CH A) I and II B) I and III C)11 and D) none of these will be miscible with the others 11) what mass of NaCl is contained in 24.88 g of a 15.00% by mass solution of NaCl in water? A) 20.00 g B) 21.15 g C) 3.73 g D) 1.50 g 12) Determine ,alton for a hypothetical ionic compound MX2 if the tue (MX2)-487 klimol and the AHny dration (MX) 703 kJ/mol. A) +595 kJ/mol B)-1190 kJ/mol C) +1190 kJ/mol D)-216 kJ/mol

Explanation / Answer

Ans 6 : B) 188 g

Since the heat of vaporization of acetone is 31.3 KJ/mol , the amount of heat required to vaporize one mole will be 31.3 KJ.

The number of mol of acetons vaporized , when 128 KJ of heat is given will be equal to :

= 128 / 31.3

= 4.09 mol

So the mass of acetone vaporized = 4.09 x molar mass

= 4.09 x 46.07

= 188 g

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