January 2009 Chemistry Regents #65-66

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Base your answers to questions 65 through 66 on the information below.

The balanced equation below represents the reaction between magnesium metal and hydrochloric acid to produce aqueous magnesium chloride and hydrogen gas.

Mg(s) + 2HCl(aq) ==> MgCl2(aq) + H2(g)

A piece of Mg(s) has a volume of 0.0640 cubic centimeters. This piece of Mg(s) reacts completely with HCl(aq) to produce H2(g). The H2(g) produced has a volume of 112 milliliters and a pressure of 1.00 atmosphere at 298 K.

65 The volume of the piece of Mg(s) is expressed to what number of significant figures? [1]

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3 sig figs

0.0640

66 In the space in your answer booklet, show a correct numerical setup for calculating the volume of the H2(g) produced if the conditions are changed to STP. [1]

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on to Questions 67-68

 

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

Questions 51-53 Questions 54-55 Questions 56-58 Questions 59-61 Questions 62-64 Questions 65-66 Questions 67-68 Questions 69-71 Questions 72-74 Questions 75-77 Questions 78-79 Questions 80-81

 
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