Limiting Reactants (ht Only) (GCSE Chemistry)

A sample contains 5.85 g Fe and 8.00 g O2 which react to form Fe2O3 (4Fe + 3O2 ? 2Fe2O3). Which is the limiting reactant?

30.0 g NO reacts with 30.0 g O2 via 2NO + O2 ? 2NO2. What mass of NO2 forms?

A student mixes 0.100 mol HI(g) in a system at equilibrium for 2HI ? H2 + I2. What effect would increasing the pressure have on the equilibrium position?

14.0 g N2 reacts with 6.00 g H2 (N2 + 3H2 ? 2NH3). What mass of NH3 is produced (to 3 s.f.)?

After the reaction in the previous question, how much aluminium (in g) remains unreacted?

Given A + 2B ? C, if you start with 0.50 mol A and 1.00 mol B, which statement is correct?

An equilibrium mixture of brown NO2 and colourless N2O4 in a sealed syringe is compressed (pressure increased). After re-equilibration the mixture appears lighter in brown colour. Which statement matches this observation?

A student obtains 3.00 g product when the theoretical yield is 4.00 g. What is the % yield?

If 10.0 g sodium reacts with 10.0 g chlorine gas (Cl2) to produce NaCl (2Na + Cl2 ? 2NaCl), what mass of NaCl is produced (to 3 s.f.)?

Treat 10.0 g of CaCO3 to give CaO + CO2. If the CaO is 5.61 g theoretical, what is percent atom economy for producing CaO from CaCO3? (atom economy = (Mr desired product ÷ Mr reactants)×100)

What mass of aluminium is needed to react completely with 100.0 g Fe2O3 in the reaction 2Al + Fe2O3 ? Al2O3 + 2Fe ?