Partial answers to
Reactions balancing and mole review
Combustion reactions
Name: ____________________ period: _____
Balance the following hydrocarbon/carbohydrate combustion reactions: (use scratch paper as needed)
1)
__6_12_ C6H6 + _15/2_ 15__ O2  __6_12_ CO2 + _3_6__ H2O
2)
____ CH3OH + ____ O2  ____ CO2 + ____ H2O
3)
____ C4H8 + ____ O2  ____ CO2 + ____ H2O
4)
__1_2_ C6H12O6 + _9/2_ 9__ O2  __6_12_ CO2 + __3_6_ H2O
5)
__1_2_ C8H18 + __25/2_ 25_ O2  __8_16_ CO2 + __9_18_ H2O
6)
__1__ CH4 + __2__ O2  __1__ CO2 + __2__ H2O
7)
____ C2H6 + ____ O2  ____ CO2 + ____ H2O
8)
____ C3H6O2 + ____ O2  ____ CO2 + ____ H2O
Write a balanced equation for the complete combustion of the following
9)
_1__ C21H44 + __32__ O2  __21__ CO2 + __22__ H2O
10)
C20H42
Mole conversions
(Remember to use the periodic table when necessary,
and that one mole of any gas at STP occupies a volume of 22.4 liters, one mole = 6. 02 x 1023)
1. How many liters of carbon dioxide are present in 200 g of CO2?
(Convert to moles, then to volume)
250 g CO2 (1 mole CO2/ 44.0 g CO2) ( 22.4 L CO2 / 1 mol CO2) = 127.27 L CO2 or 130 g CO2
2. If you have 3.8 liters of helium gas, how many atoms of helium would that be?
3. What would be the mass of 250 liters of N2 gas at STP?
250 L (1 mole N2/ 22.4 L N2) ( 28.0 g N2 / 1 mol N2) = 312.5 g N2
or 310 g N2
4. How many kilograms of gold should you weigh out to get 1.00 x 10 30 atoms
1.00 x 1030 atoms Au ( 1 mol Au / 6.02 x 1023 atoms)( 197 g Au / 1 mol Au)( 1 kg / 1000 g) = 327242.5249 or 327,000 kg Au
5. How many atoms of sulfur are there in 50.0 g of copper (II) sulfate, CuSO 4 ?
Balance these equations and identify the type of reaction. (Synthesis, Decomposition, Single
Replacement, Double Replacement or Combustion)
Type of reaction
6. __SrBr2 + __(NH4)2CO3
7. _1_ SiC + _2_ Cl2
8. __ Cl2 + __ Ca
__SrCO3 + __NH4Br
_1_SiCl4 + _1_C
__ CaCl2
9. __ C2H6 + __ O2
__CO2 + __H2O
10. _2_ (NH4)2Cr2O7
_4_ NH3 + _2_ H2O + _2_ Cr2O3 + _3_ O2
11. _1_ Pb(NO3)2
_1_ PbO + _2_ NO2 + _1_O2
12. __ H2O + __ Mg
13. __ C2H5OH + __ O2
__ Mg(OH)2 + H2
__ H2O + __CO2
____________
__single replacement_
____________
____________
_decomposition_
___synthesis___
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