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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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Convert 250 cm3 into dm3.
Which conversion is correct? 500 cm3 = ?
How many C70 molecules can be made from one mole of carbon atoms? (Avogadro = 6.02 × 10^23)
A reaction has a maximum theoretical salt mass of 12.5 g. If the percentage yield is 92.8%, what mass of salt is actually produced?
A sample of gas has 3.01 × 10^22 molecules. How many moles is this?
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 molecules are in 2.00 mol of CO2? (Avogadro constant = 6.02 × 10^23 mol-1)
What is the number of moles in 40.0 cm3 of a 0.250 mol/dm3 solution?
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)
What is the percentage by mass of iron in Fe3O4? (Ar: Fe = 56, O = 16)
Which relative atomic mass (Ar) corresponds to element with isotopic data: mass-6 (7.6%), mass-7 (92.4%)? Give answer to 1 decimal place.