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2002 - Multiple Choice - Q3 - HSN forum

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2002 - Multiple Choice - Q3


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#1 AM4R

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Posted 26 May 2006 - 09:13 AM

How do work out Q 3 on the multiple choice? Its really bugging me coz it comes up nearly every year?
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#2 Pammy

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Posted 26 May 2006 - 09:36 AM

Mg(s) + 2H+(aq) -------> Mg power2.gif+(aq) + H base2.gif (g)

1 mole Mg reacts with 2 moles 2H+ so...
0.1 mole Mg reacts with 0.2 moles 2H+


no. moles = V x C
0.2 = 4V
0.05 m power3.gif = V

Answer: B
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#3 AM4R

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Posted 26 May 2006 - 12:04 PM

thanks smile.gif
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