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Take the 3rd plural form (the "they" form) of a verb in the preterite tense. Take off the "ron" from the end of the verb, then add the relevant subjenctive ending, either:ra (I), ras (...

Question 4 is the first instance in the paper where a student is required to use more than one source, and again the first question to concentrate in-depth on the effects of language.<...

concentration = moles / volume

must convert volume into litres 1 litre = 1000cm3 (divide by 1000)

c= n/v = 0.4/0.025 = 16mol/l