5. The half life for a first order reaction is 27 min. How long will it take for

Question

5. The half life for a first order reaction is 27 min. How long will it take for 4 halr lives to. A) Not enough information given B) 260 min C) 53,000 min D) 81 min E) 108 min 6. Calculate the mass percent of HOCH,CH,Ol in a solution made by dissolving 32 of HOCH CH2OH in 43.5g of water. A) 6.9% 13) 7.4% C) 22% D) 29% E) 2.996 7. What is the boiling point of a solution of 11.0 g of lactose (CuallzOi) in 145.0g or water? (K (H:O) 0.52 °C/m) A) 102.2 °C B) 105.7°C C) 99.9 °C D) 100.1°C E) 0.1°C 8. Which of the following liquids would make a good solvent for iodine, 1:? A) H2O B) CHjOH C) NHs D) CS2 E) HCI How many grams of water are needed to dissolve 27.8 g of ammonium nitrate in order to prepare a 0.452 m solution? 9. A) 157 g B) 100. g C) 0.157 g D) 769 g E) 36.2 g

Explanation / Answer

Answer 5) 1 half life is 27 minute

4 half life = 4*27=108 minute

Answer 6) mass %= {mass of HOCH2CH2OH/ (mass of HOCH2CH2OH+mass of water )}*100

= {3.2/(3.2+43.5)}*100= 6.85 % = 6.9 %

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