Assignment $3[109]$

Components in a solution can be present in different concentrations or ratios of solute to solvent.

$1\mathrm{.}1$ Define concentration as percent by mass.

$1\mathrm{.}2$ Calculate the following concentrations by mass of

$1\mathrm{.}2\mathrm{.}15\mathrm{.}00g$ of magnesium nitrate in enough water to make $80\mathrm{.}0g$ of solution.

$1\mathrm{.}2\mathrm{.}26\mathrm{.}0mg$ of ethanol in enough water to make $3\mathrm{.}0g$ of solution.

$[1]$

$1\mathrm{.}2\mathrm{.}32\mathrm{.}00ng$ of sodium chloride and $7\mathrm{.}0g$ of water.

$[3]$

$2.$

$[3]$

$2\mathrm{.}1$ Define concentration as percent by volume.

$2\mathrm{.}2$ Express the following concentrations as percent by volume of

$2\mathrm{.}2\mathrm{.}1200ml$ of ether in enough carbon tetrachloride to make $1\mathrm{.}0L$ of solution.

$2\mathrm{.}2\mathrm{.}23\mathrm{.}0ml$ of ether in enough carbon tetrachloride to make $2\mathrm{.}00L$ of solution.

$2\mathrm{.}2\mathrm{.}325\mathrm{.}0ml$ of ethanol in enough water to make $100\mathrm{.}0ml$ of solution.

$3.$

$3\mathrm{.}1$ Define concentration as percent mass$/$volume$.$

$3\mathrm{.}2$ Express the following concentrations as percent mass$/$volume of

$3\mathrm{.}2\mathrm{.}125\mathrm{.}0g$ of sodium nitrate in $1\mathrm{.}0L$ of solution.

$[3]$

$[1]$

$3\mathrm{.}2\mathrm{.}215\mathrm{.}0g$ of sodium hydroxide dissolved in $100\mathrm{.}0g$ of solution $($Assume that density of the solution is $1\mathrm{.}00\frac{g}{c}{m}^3.)$

$4.$ Consider a $10\%$ by mass ethanol$-$water solution. Calculate

$4\mathrm{.}1$ in $100\mathrm{.}0g$ solution, the volume of ethanol with a density of $0\mathrm{.}800\frac{g}{c}{m}^3.[3]$

$4\mathrm{.}2$ in $250\mathrm{.}0g$ solution, the volume of ethanol with a density of $0\mathrm{.}800\frac{g}{c}{m}^3.[3]$

$5.$ If a human's blood$-$sugar level falls below $60mg$ per $100mL,$ insulin shock may occur. Calculate the percent concentration by mass of sugar in the blood with a density of $1\mathrm{.}2\frac{g}{m}L$

$6.$ Consider $500g$ of a $60\%$ by mass aqueous potassium chloride solution and calculate the mass of potassium chloride.

$[3]$

$7.$ Consider ether of density $0\mathrm{.}714\frac{g}{c}{m}^3$ and calculate the volume of ether present in $500g$ of a $4\mathrm{.}0\%$ by mass ether$/$carbon tetrachloride solution.

$[4]$

$8.$ Consider the following reactions and write the corresponding reaction quotient

$3$

$8\mathrm{.}1$

$8\mathrm{.}2$

$8\mathrm{.}3$

$8\mathrm{.}4$

$8\mathrm{.}5$

$3]$

$3]$

$[1]$

$[1]$

$3]$

the

$q,$

$q,$

$9.$ Write the equilibrium constant expression for the following reaction

$kA+mBnC+oD$

$[3]$

$[3]$

$[3]$

$[3]$

$[3]$

$10.$ Consider the following reaction and calculate the equilibrium constant

$10.$ Consider $N_2(g)+3H_2(g)2N{H}_3(g).$

$10\mathrm{.}1[N_2]=0\mathrm{.}921M$;$[H_2]=0\mathrm{.}763M$;$[N{H}_3]=0\mathrm{.}157M$

$10\mathrm{.}2[N_2]=0\mathrm{.}399M$;$[H_2]=1\mathrm{.}197M$;$[N{H}_3]=0\mathrm{.}203M$

$10\mathrm{.}3[N_2]=2\mathrm{.}590M$;$[H_2]=2\mathrm{.}770M$;$[N{H}_3]=1\mathrm{.}820M$

$12.$ Consider the reaction between carbon monoxide anperature. $[2]$ dioxide gas and hydrogen gas at $700K$ the equilibrium constant is $5\mathrm{.}10-1\mathrm{.}000$ produce carbon of each component is initially present in a $1\mathrm{.}000L$ reaction vessel.

$12\mathrm{.}1$ write the correct reaction equation.

$12\mathrm{.}2$ calculate the equilibrium concentrations of all species.

$[1]$

$13.$ Consider the decomposition of gaseous NOCl to form the gases $NO$ and $Cl.$ At $35C$ the equilibrium constant is $1\mathrm{.}6{10}^{-5}\mathrm{.}1\mathrm{.}0$mol of NOCl is initially placed in $2\mathrm{.}0L$ reaction vessel.

$13\mathrm{.}1$ Write the correct reaction equation.

$13\mathrm{.}2$ Calculate the equilibrium concentrations.

$[1]$

$14.$ Consider in the synthesis of ammonia an equilibrium reaction mixture given by $[N2]=0\mathrm{.}399M$;$[H_2]=1\mathrm{.}197M$;$[N{H}_3]=0\mathrm{.}202M.$

$14\mathrm{.}1$ Write the reaction equation.

$14\mathrm{.}2$ Calculate the equilibrium constant.

$[3]$

$15.$ Calculate the reaction quotient in $14.,$ after $1\mathrm{.}000$ mol nitrogen were added to one litre of the reaction mixture.

$[3]$

$4$

$16.$ Compare the $K$ and $Q$ values in $14\mathrm{.}2$ and $15$ and predict the following behaviour of the reaction. Provide all your reasoning.

$[4]$

$17.$ Consider the cases where the same amount of either hydrogen or ammonia were added to the mixture instead of nitrogen and pre