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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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Below a typical questions that will be covered in this test. You final score will be logged on your account

A sample of gas has 3.01 × 10^22 molecules. How many moles is this?
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.)
Which volume corresponds to 375 moles of gas at RTP (1 mol = 24.0 dm3)?
What is the number of atoms in 0.25 mol of a pure element? (use Avogadro = 6.02 × 10^23)
How many C70 molecules can be made from one mole of carbon atoms? (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.)
What is the mass of 1.00 mol of sodium atoms? (Ar Na = 22.99)
What is the percentage by mass of iron in Fe3O4? (Ar: Fe = 56, O = 16)
What is the formula mass (Mr) of CaCO3? (Ar: Ca = 40.1, C = 12.0, O = 16.0)
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 is the concentration (in mol/dm3) of a solution containing 0.0150 mol solute in 50.0 cm3?