How much? The amount of chemical change

(i) The first step is the catalytic oxidation of ammonia gas to nitrogen monoxide. $\ce{4NH3(g) + 5O2(g) -> 4NO(g) + 6H2O(g)}$ Determine the volume, in dm$^3$, of nitrogen monoxide produced from 20.0 g of ammonia, at STP, using section 2 of the data booklet.…

(i) Determine the enthalpy of combustion of pentane, in kJ mol$^{-1}$, using table 12 in the data booklet. $\ce{C5H12(g) + 8O2(g) -> 5CO2(g) + 6H2O(g)}$ (ii) Calculate the mass, in g, of carbon dioxide, $\ce{CO2}$, produced when 45.0 g of pentane react with…

A sample of the sodium hydroxide solution is gradually added to 25.0 cm$^3$ of an aqueous solution of an unknown organic acid, producing the following pH curve. Calculate the concentration of the unknown organic acid.

Which substances will be present in the reaction vessel at the end of the reaction between 1.5 g of magnesium and 50.0 cm3 of 1.0 mol dm⁻³ hydrochloric acid? $\ce{Mg(s) + 2HCl(aq) -> MgCl2(aq) + H2(g)}$ A. $\ce{HCl(aq)}$, $\ce{MgCl2(aq)}$ B. $\ce{Mg(s)}$,…

(i) Suggest, giving a reason for each, two different safety precautions that should be taken when carrying out either of these preparations. (ii) Deduce the coefficients needed to balance the following equation for the reaction of silver with concentrated…

Gallium forms a sulfate of formula $\ce{Ga2(SO4)3}$. (i) Both ionic and covalent bonding are present in this compound. State which particles are held together by each type of bond. (ii) Contrast covalent and ionic bonds in terms of what happens to the valence…

Write an equation for the reaction, including state symbols.

Deduce which reactant is limiting. Use sections 1, 4 and 7 of the data booklet.

For the runs with 0.40 and 0.80 $\mathrm{mol\,dm^{-3}}$ $\ce{HNO3(aq)}$, suggest which reactant, $\ce{CaCO3(s)}$ or $\ce{HNO3(aq)}$, was the limiting reagent. Give a reason for your answer.

What volume of propane gas, in $\mathrm{cm^3}$, must be burned completely in oxygen to give 90 $\mathrm{cm^3}$ of carbon dioxide, all volumes being measured at the same temperature and pressure? $\ce{C3H8(g) + 5O2(g) -> 3CO2(g) + 4H2O(g)}$ A. 18 B. 30 C. 90 D.…