Mixed Stoichiometry Practice
Write and/or balance the following equations (remember the diatomic elements and to crisscross charges for ionic compounds!!!)
Use the mole ratios from the balanced equations to
solve the following stoichiometry problems. Use units and labels in all conversions, and round
your answer to sig figs.
1. Potassium chlorate decomposes into potassium chloride and oxygen gas.
Balanced Equation:
2. How many moles of oxygen are produced when 3.0 moles of potassium chlorate
decompose completely?
3. Butane (C4HlO) undergoes combustion.
Balanced Equation:
~
C'WID
JJ
f- /2/1
PV~
--=:0,
7
t
C'1lI
Vs
r/O~O
4. How many grams of CO2 are produced when 88 g of O2 are reacted with an excess of
butane?
5. Water decomposes into hydrogen gas and oxygen gas by electrolysis.
Balanced Equation:
6. How many grams of hydrogen will be produced when 6.0 moles of oxygen are produced?
J
7. How many water molecules are required to produce 9.00 grams of hydrogen?
/
8. Cobalt(ll) chloride reacts with fluorine
Balanced Equation:
CoCI f).
a~ +-
-'7
0-
+-
CJ~
9. How many grams of fluorine are required to produce 290.8 g of rcobalt(lI) fluoride?
6/1<1 a . 8'}-
Co Ii(
i/;-Y/fa
f,'
/~5-
i"'"f C,r;L ~
i •••
1~,cra(JF-r
:::
'fY'~Cbfi
114,°9/
0--
10. Balance the following equation.
__
SrCI2(aq) +
H2S04(aq) --+
:J...
HCI(aq) + __
SrS04(s)
11. What is the mass of strontium chloride that reacts with 300.0 g of sulfuric acid?
/kJ"t~('",f
&CI{
I~ /IzS Or
3.Do~ Ii,.''''t ( I"'"
cr 8' 1&I/#J
i58.1j]
IIt"Ift.
1.q
SrcI~
8> S,d
'iT
J,
12. Solid iron(llI) oxide reacts with hydrogen gas to form iron and water.
Balanced Equation:
Fe~2> "dM-z-.
--7
Zte
t- .3
\-\vO
13. How many grams of iron are produced when 450 grams of iron(llI) oxide are reacted?
450~ fe
~t
,0.., (:, ...1 F,.0,
t5""1.
trFeA
lP
2 ""- Fe. \
I~ ~
f
1'"
5". t
re"
\\Y6 \
31(,f.••
>
I
-)
.3/0a-
14. How many grams of water will be produced when 0.0155 moles of hydrogen gas rea It
completely with iron(llI) oxide?
6. Dl5S
VM1
1-i2~ 3W41 U~
3 wJ It
-------~-----------_._--_.
\~ ~~O~~[
'Do zfq ~
~O
\ wo{ ~-z,O
__ ._---_
..
-
._~_ __ ._. -~-_.~
..
..
:Oe,