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Amounts Of Substances In Equations (ht Only) (GCSE Chemistry)

The following is a GCSE Chemistry test covering 'Amounts Of Substances In Equations (ht Only)' from the broader topic Quantitative Chemistry. The test is geared towards the AQA exam board style syllabus.
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30.0 cm3 of Si2H6 reacts with excess O2 according to 2 Si2H6 + 7 O2 ? 4 SiO2 + 6 H2O(g). If O2 in excess is 150 cm3, what is the total volume of gases present after the reaction (all volumes measured at same T & P)?
Calculate the moles of CO2 produced when 40.0 kg Fe2O3 reacts with excess carbon according to 2 Fe2O3 + 3 C ? 4 Fe + 3 CO2. (Mr Fe2O3 = 160; 1 mol gas = 24.0 dm3 but here moles requested)
Which volume corresponds to 375 moles of gas at RTP (1 mol = 24.0 dm3)?
What is the atom economy (to 3 s.f.) for the production of ZnCl2 in Zn + CuCl2 ? ZnCl2 + Cu? (Use relative formula masses: Zn 65.4, Cu 63.5, Cl 35.5)
What volume (in dm3) does 0.50 mol of an ideal gas occupy at room temperature and pressure (take 1 mol = 24.0 dm3)?
What is the concentration (in mol/dm3) of a solution containing 0.0150 mol solute in 50.0 cm3?
How many moles of H2 are in 4800 cm3 (4.800 dm3) of gas at room temperature and pressure (1 mol = 24.0 dm3)?
What is the mass of 1.00 mol of sodium atoms? (Ar Na = 22.99)
What is the number of atoms in 0.25 mol of a pure element? (use Avogadro = 6.02 × 10^23)
25.0 cm3 of 0.124 mol/dm3 Na2CO3 is neutralised by 23.6 cm3 of HNO3 (Na2CO3 + 2 HNO3 ? …). What is the concentration of HNO3? (give to 3 s.f.)
Calculate the empirical formula of a compound that contains 40.0% C, 6.7% H and 53.3% O by mass. (Use atomic masses C=12, H=1, O=16.)