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Worksheet #15 Using Molar Ratios
Topics: Using Molar Ratios to Find Quantities of Reactants and/or Products
Solve the following problems using dimensional analysis. Always include the units and
the correct number of significant figures with your answer. Remember that the chemical
species (the chemical formula of the atom, ion or molecule) is now part of the unit,
A] How many grams of 12 can be fanned if 12.3 g of Brz react?
B1"2(l) + 2 KI (aq) ~ 2 KBr(aq) + 12(s)
B] How many grams of Co are required to form .748 grams OfCOl03?
4 Co(s) + 3 02{g) ~ 2 C0203(S)
C] HOlY much 0_ is needed to react exactlv.. with 7.9 ~
QI"an1Sof P..•?
P..•(s) ~ 5 02(g} ~ P401O(S)
.---."
DJ If7.S:;'::: x ~O::atoms of Al react. ~_O\- many molecules ofHN03are
with it?
.2 A1{SI- 6 H",,;-o.,laq} ----" _ AY;":O~}:'a--:}- 3 H:(g)
needed
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