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Thursday, April 21, 2011

Thurs., Apr. 28, 2011

Objectives: Ba able to determine which reactant
is limiting the reaction and which will be
left over ("excess")
Announcements: All last work is due today if you
want
it to be counted for the 6 wks.
Get rockets done this weekend!
Warm-up: 72 grams of magnesium nitrate is
produced from the action of a sodium nitrate
solution on crystalline magnesium hydroxide.
What mass of sodium nitrate had to be used?
How many molecules of sodium nitrate is that?
Steps in the process...
  • Write correct formulae
  • Balance the Equation
  • Molar masses of all substances involved
  • Given grams --> moles (use mm)
  • moles given --> moles wanted (use ideal ratio)
  • moles --> grams
    and/or
  • moles --> molecules/atoms/ions/...
Limiting & excess reactants:
40g Al(NO3)3 + 24g Mg

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