January 2018 Chemistry Regents #60-62

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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

Questions 51-54
 Questions 55-56 Questions 57-59 Questions 60-62 Questions 63-65  Questions 66  Questions 67-69  Questions 70-72 Questions 73-77 Questions 78-81 Questions 82-85  

 

 

 

 

 #60-62
  

Given the unbalanced equation showing the reactants and product of a reaction occurring at 298 K and 100. kPa:

P4(s) + Cl2(g) → PCl3(ℓ) + energy

60 Balance the equation in your answer booklet for the reaction, using the smallest whole number coefficients. [1]

HIGHLIGHT TO SEE THE ANSWER

P4(s) +  6  Cl2(g) →   4  PCl3(ℓ)

61 State why this reaction is a synthesis reaction. [1]

HIGHLIGHT TO SEE THE ANSWER

Two reactants form only one product.

62 Show a numerical setup for calculating the percent composition by mass of chlorine in PCl3(ℓ) (gram-formula mass = 137 g/mol). [1]

HIGHLIGHT TO SEE THE ANSWER

 ( (3 x 35.5)/136) x 100
  

on to Questions 63-65

  

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

Questions 51-54
 Questions 55-56 Questions 57-59 Questions 60-62 Questions 63-65  Questions 66  Questions 67-69  Questions 70-72 Questions 73-77 Questions 78-81 Questions 82-85