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chemistry of stoichiometryexamples and calcuations
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Stoichiometry Examples
Mass to Mass Calculations
Balanced Equation3 A + 2 B = 3 C + 1 D Given x g of A, find amount of mass (#) of B required for the reaction
x g A x 1 mol A = y mol A molar mass g A
y mol A x 2 mol B = z mol B(from the balanced equation) 3 mol A
z mol B x molar mass g B = # g B 1 mol B
2 A + 1 B = 1 C + 2 D Calculate mass (#) of A to yield x g of C,
x g C x 1 mol C = y mol C molar mass g C
y mol C x 2 mol A = z mol A(from the balanced equation) 1 mol C
z mol A x molar mass g A = # g A 1 mol A
Mass to Volume Calculations
Balanced Equation2 A + 6 B = 2 C + 3 D Given x g of A, find volume of gas (L) of D produced
x g A x 1 mol A = y mol A molar mass g A
y mol A x 3 mol D = z mol D(from the balanced equation) 2 mol A
z mol D x 22.4 L D = # L D 1 mol D
2 A = 2 B + 3 C Calculate volume (L) of gas of C given x g of A
x g A x 1 mol A = y mol A molar mass g A
y mol A x 3 mol C = z mol C(from the balanced equation) 2 mol A
z mol C x 22.4 L C = # L C 1 mol C
Volume to Volume Calculations
Balanced Equation2 A + 1 B = 2 C Given x L of A, find volume of gas (L) of B that reacts to produce C
x L A x 1 L B = y L B(from the balanced equation) 2 L A
Now calculate the L of C
y L A x 2 L C = z L C 2 L A
1 A + 3 B = 2 C Given x L of A, find volume of gas (L) of C that is produced
x L A x 2 L C = y L C(from the balanced equation) 1 L A
Percent Yield Calculations
Actual Yield x 100%= percent yieldTheoretical Yield