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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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In a titration 25.00 cm3 of HCl is neutralised by 23.50 cm3 of 0.100 mol/dm3 Ba(OH)2. What is the concentration of HCl? (2 HCl + Ba(OH)2 ? BaCl2 + 2 H2O)
Which conversion is correct? 500 cm3 = ?
A sample of gas has 3.01 × 10^22 molecules. How many moles is this?
How many moles of H2 are in 4800 cm3 (4.800 dm3) of gas at room temperature and pressure (1 mol = 24.0 dm3)?
How much air (in dm3) is needed to supply enough O2 to react with 3.50 dm3 of H2 in 2 H2 + O2 ? 2 H2O? (Air is 20% oxygen by volume)
How many C70 molecules can be made from one mole of carbon atoms? (Avogadro = 6.02 × 10^23)
What is the percentage by mass of iron in Fe3O4? (Ar: Fe = 56, O = 16)
The reaction: 2 A + 3 B ? 4 C. If you start with 0.500 mol A and an excess of B, how many moles of C can be formed?
Which volume corresponds to 375 moles of gas at RTP (1 mol = 24.0 dm3)?
What is the formula mass (Mr) of CaCO3? (Ar: Ca = 40.1, C = 12.0, O = 16.0)
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)