June 2012 Chemistry Regents #56-59

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Questions 1-10 Questions 11-20 Questions 21-30 Questions 31-40 Questions 41-50

Question 51 Questions 52-55 Questions 56-59 Questions 60-62 Questions 63-65 Questions 66-68 Questions 69-71 Questions 72-75  Questions 76-78  Questions 79-81  Questions 82-85

 

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  Base your answers to questions 56 through 59  on the information below.

A total of 1.4 moles of sodium nitrate is dissolved in enough water to make 2.0 liters of an aqueous solution. The gram-formula mass of sodium nitrate is 85 grams per mole.

56 ·Write the chemical formula for the solute in the solution. [1]

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NaNO3

(Na is +1 and NO3 is -1)

57 Show a numerical setup for calculating the mass of the solute used to make the solution. [1]

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1.4moles x 85g/mol

or 1.4= x /85

58 Compare the boiling point of the solution at standard pressure to the boiling point of H2O at standard pressure. [1]

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the boiling point of the solution is higher than that of the water

or  water boils at a lower temperature

59 Determine the molarity of the solution. [I]

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0.70M

WORK==>(1.4M/2.0L)

on to Questions 60-62

 

 

Questions 1-10 Questions 11-20 Questions 21-30 Questions 31-40 Questions 41-50

Question 51 Questions 52-55 Questions 56-59 Questions 60-62 Questions 63-65 Questions 66-68 Questions 69-71 Questions 72-75  Questions 76-78  Questions 79-81  Questions 82-85

 

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