Calculating Rates of Reaction Worksheet

Methods of Measuring Reaction Rate ($Cu + H_2SO_4$)

Techniques for determining reaction speed in $Cu(s) + 2H_2SO_4(aq) \rightarrow CuSO_4(aq) + 2H_2O(l) + SO_2(g)$, including tracking colour change (colourless to blue), measuring the change in mass of solid $Cu$, measuring the change in volume of produced $SO_2(g)$, or measuring the change in total mass of the beaker and its contents.

Rate of Production of $H_2$ ($10.0\,g\,Al$ in $300.0\,s$)

The reaction rate equal to $0.00185\,mol/s$, calculated when a $10.0\,g$ sample of aluminum is completely consumed in excess hydrochloric acid over $300.0\,s$ according to the stoichiometric ratio of $2Al(s)$ to $3H_2(g)$.

Decomposition Time of Water

The calculated duration of $231\,s$ required to fully decompose $100.0\,g$ of $H_2O(l)$ via $2H_2O(l) \rightarrow 2H_2(g) + O_2(g)$ when the rate of oxygen gas production is $1.2 \times 10^{-2}\,mol/s$.

Mass Rate of Hydrogen Gas Production ($2Al + 6HCl$)

The production rate of $0.00571\,g/min$ of $H_2(g)$, determined by converting an aluminum consumption rate of $0.0508\,g/min$ using molar masses and the stoichiometric ratio of $2\,mol\,Al$ to $3\,mol\,H_2$.

Combustion Equation of $C_{20}H_{42}$

The balanced chemical equation $2C_{20}H_{42} + 61O_2 \rightarrow 40CO_2 + 42H_2O$, representing the complete combustion of a candle composed of eicosane.

Mass of $C_{20}H_{42}$ Consumed

The quantity of candle consumed over $30.0\,seconds$ ($0.5\,min$), equal to $0.16\,g$, when the rate of carbon dioxide production is measured at $0.98\,g/min$.

Time of Copper Formation ($Al + CuCl_2$)

The time of $0.55\,min$ required to produce $0.89\,g$ of $Cu(s)$ in $2Al(s) + 3CuCl_2(aq) \rightarrow 2AlCl_3(aq) + 3Cu(s)$ when the rate of consumption of $Al$ is $0.46\,g/min$.

Combustion Equation of Paraffin ($C_{28}H_{58}$)

The balanced chemical equation $2C_{28}H_{58} + 85O_2 \rightarrow 56CO_2 + 58H_2O$, describing the combustion of paraffin wax.

Average Rate of Consumption of Paraffin

The burning rate of $0.0917\,g/min$, determined from the candle's mass decreasing from $24.5\,g$ to $23.4\,g$ between the time interval of $12.0$ and $24.0\,minutes$.

Rate of $CO_2$ Production from Paraffin

The rate of $0.0065\,mol/min$, calculated by converting the paraffin consumption rate of $0.0917\,g/min$ using the molar mass of $C_{28}H_{58}$ ($394.86\,g/mol$) and the molar ratio of $56\,mol\,CO_2$ to $2\,mol\,C_{28}H_{58}$.

Reaction Rate of Open Beaker Mass Loss ($Cu + HNO_3$)

A rate of $1.825\,g/min$ observed between $2.0$ and $6.0\,minutes$ for $3Cu(s) + 8HNO_3(aq) \rightarrow 3Cu(NO_3)_2(aq) + 2NO(g) + 4H_2O(l)$, caused exclusively by the escape of gaseous $NO$ from the system.

Mass of Copper Consumed (First $5\,Minutes$)

The total amount of $32.1\,g$ of copper reacted, calculated from an $NO(g)$ loss rate of $2.02\,g/min$ over the first $5.0\,minutes$ of the nitric acid reaction.

Stoichiometric Coefficient Deduction from Reaction Rates

The principle that when the instantaneous consumption rates of reactants ($C$ and $X$ at $$0.002