16. At a given temperature and pressure,a sampleofGas A is observed to diffuserw

Question

16. At a given temperature and pressure,a sampleofGas A is observed to diffuserwice as fast as a sample of a different gas, B. Based on this: A) The molar mass of A is 0.707times that of B D) The molar mass of A is one half that of B E) The molar mass of A is one fourth that of B 7 A 0,307-g sample ofan unknown triprotic acid is titrated to the third onuivalence point using 35.2 mL of 0.106 M NaOH. Calculate the molar mass of the acid A) 247 mol 151 gmol C) 82.7 g mol D) 171 g mol 15. absorbs 402Jof heat and then performs 786 Jofwork. The change in intermal enerzy of the gas is A) -384 J B) 384 J C) -1188 J D) 1188 E) none of these 19. Given the heats of the following reactions: -1225.6 IL Pds) 50:(g) Pooho(s) 2967.3 285.7 Calculate the value of AH for the reaction below: A) -610.1 B) -110.5 E) None of is within 5% of the comect answer. these

Explanation / Answer

true answer is 16) C 17)D 18)A 19)A 20)B

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