AP Chemistry - Balancing Equations

_Fe2O3 + _HCl ⇌ _FeCl3 + _H2O

The Following question will be based on the unbalanced reaction above

For the reaction above to be balanced what coefficient should be in front of the compound HCl?

Balance the following equation:

FeCl3 + NOH5 → Fe(OH)3 + NH4Cl

Consider the following reaction:

$KMnO_{4} + HCl \rightarrow KCl + MnCl_{2} + H_{2}O + Cl_{2}$

When the equation is balanced, what will be the coefficient in front of HCl?

Balance the following chemical equation.

$NaOH + FeCl_{3} \rightarrow NaCl + Fe(OH)_3$

Transesterification is an industrially important process for the production of biodiesel fuel (that most diesel engines can run cleanly on) and glycerin from triglycerides (usually people use vegetable oil as their feedstock).

One easy to do and high yielding method involves the reaction of ethanol or methanol with sodium hydroxide to produce the super bases sodium ethoxide or sodium methoxide respectively. The super base is then used in the transesterification reaction with triglycerides to produce glycerin and ethyl or methyl esters (biodiesel). The products can easily be separated by differences in density. Note: For this reaction to occur the reactants must be free of water as when water is present saponification occurs (how soap is made) which will compete with the transesterification reaction. Note: just because the reaction described above is easy doesn't mean that it is anywhere near safe; please do thoroughly research any reaction you plan to undertake and take all possible safety precautions. That being said, this process is becoming much more popular lately and with the recent focus on alternative energy may well soon account for a decent portion of fuel production.

Catalyst formation equation:

$NaOH+CH_3OH\rightleftharpoons Na^+CH_3OH+H_2O$

Unbalanced transesterification equation:

$RCO_2CH_2CH(O_2CR)CH_2CO_2R +CH_3OH \xrightarrow[]{Catalyst} C_3H_8O_3+CH_3CO_2R$

Balance the following transesterification reaction assuming that all R-groups are identical:

$RCO_2CH_2CH(O_2CR)CH_2CO_2R +CH_3OH \xrightarrow[]{Catalyst} C_3H_8O_3+CH_3CO_2R$

$S + HNO_{3} \rightleftharpoons H_{2}SO_{4} + NO_{2} + H_{2}O$

In the balanced version of the preceding equation, what is the coefficient of nitrogen dioxide?

Consider the following unbalanced equation:

$Fe+Cl_2\rightarrow FeCl_3$

How many grams of solid iron are needed to make 36.0g of $FeCl_3$ ? Assume that chlorine is in excess.

After the following reaction is balanced, how many moles of H2O can 4 moles of C2H6 produce?

__C2H6(s) + ___O2(g) → ___H2O(l) + ___CO2(g)

Balance the following equation:

NaOH + H2SO4 → H2O + Na2SO4

Calcium hydroxide is treated with hydrochloric acid to produce water and calcium chloride. Write a balanced chemical reaction that describes this process.

Balancing Equations

Practice Questions

Transesterification is an industrially important process for the production of biodiesel fuel (that most diesel engines can run cleanly on) and glycerin from triglycerides (usually people use vegetable oil as their feedstock).