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Mass Mass

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Mass Mass Ch 8 Blue Book Mass-Mass problems are done when we want to find the amount of a compound made from a known amount of another compound. – PowerPoint PPT presentation

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Title: Mass Mass


1
Mass Mass
  • Ch 8 Blue Book

2
  • Mass-Mass problems are done when we want to find
    the amount of a compound made from a known amount
    of another compound.
  • Stoichiometry

3
Example
  • Zinc metal and hydrochloric acid react to form
    zinc chloride and hydrogen gas. How many grams
    of H2 are made from 10.0 g HCl?
  • Step 1 Write out and balance the chemical
    equation.
  • Zn 2HCl ? ZnCl2 H2
  • Step 1.5 identify your known and unknown, draw
    an arrow going from your known amount to your
    unknown amount.

4
  • Step 2 Convert grams of given ? mols
  • Step 3 Determine mole to mole ratio from
    balanced equation convert moles of given to
    moles of required (unknown amt. you are trying to
    find)
  • Step 4 Convert moles of required (unknown)?
    grams

5
  • Zinc metal and hydrochloric acid react to form
    zinc chloride and hydrogen gas. How many grams
    of H2 are made from 10.0 g HCl?
  • Zn 2HCl ? ZnCl2 H2
  • Answer 0.27 g H2

6
Example
  • Calculate the grams of NaOH required to produce
    15.0 grams of Na2SO4 by the neutralization of
    NaOH with excess H2SO4.
  • Step 1 Write Balance Equation
  • Step 1.5 I.D. known unknown
  • Step 2 mass of known ? mols of known
  • Step 3 mols of known ? mols of unknown
  • (Stoichiometric Ratio)
  • Step 4 mols of unkown ? mass of unknown

8.45 g NaOH
7
Example
  • Washing soda (sodium carbonate decahydrate) is a
    hydrated compound used for washing, water
    softening and bleaching. If a sample of sodium
    carbonate decahydrate has a mass of 20.0 grams
    and 10.0 of this 20.0 gram sample is inert, what
    mass of sodium carbonate will be left when the
    material is heated to drive off the water of
    hydration?

6.67 g Na2CO3
8
HW Assignment
  • 1-8 Due 4/8 pg. 79
  • 9-16 Due 4/10 pgs. 82-83
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