June 2017 Chemistry Regents #78-81

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Questions 1-5 Questions 6-10 Questions 11-15 Questions 16-20 Questions 21-25 Questions 26-30 Questions 31-35 Questions 36-40 Questions 41-45 Questions 46-50

Question 51-53 Questions 54-57 Questions 58-60 Questions 61-63 Questions 64-65 Questions 66-68 Questions 69-71 Questions 72-76  Questions 77-80  Questions 81-82  Questions 83-85 

 

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Question 81-82

 

 

Base your answers to questions 78 through 81 on the information below and on your knowledge of chemistry.

A solution is made by dissolving 70.0 grams of KNO3(s) in 100. grams of water at 50.oC and standard pressure.

8l Show a numerical setup for calculating the percent by mass of KNO3 in the solution. [1]

Answer-->  ( 70.0g/(100.g +70g))  x 100%

82 Determine the number of additional grams of KNO3 that must dissolve to make this solution saturated. [1]

Answer--> 15g  (use Table G)

on to Questions 83-85

 

Questions 1-5 Questions 6-10 Questions 11-15 Questions 16-20 Questions 21-25 Questions 26-30 Questions 31-35 Questions 36-40 Questions 41-45 Questions 46-50

Question 51-53 Questions 54-57 Questions 58-60 Questions 61-63 Questions 64-65 Questions 66-68 Questions 69-71 Questions 72-76  Questions 77-80  Questions 81-82  Questions 83-85 
 

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