1) mass = a) moles /Mr b) moles x Mr c) moles + Mr d) Mr/ moles 2) concentration = a) moles x volume b) volume / moles c) moles / volume d) moles + volume 3) To convert the number of moles from a 250 ml solution to a 25 ml solution you would: a) divide by 10 b) multiply by 10 c) divide by 25 then x by 250 d) divide by 1000 4) If data is given to 2 d.p in question what accuracy should you give your final answer? a) 3 s.f b) 2 s.f c) 2 d.p d) 3 d.p 5) To convert from the empirical formula to the molecular formula you would need to know: a) Avagadros number b) Relative atomic mass c) Relative molecular mass d) The number of moles 6) To find out the mass in grams of one mole of atoms of an element you would use: a) mass number b) atomic number c) avagadros number d) none of the above 7) If sulphuric acid reacts with sodium hydroxide,given the moles of sodium hydroxide how would you calculate the moles of sulphuric acid? a) x 2 b) x 4 c) / 2 d) / 4

mole calcs

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