Question 6

6.1 Methyl propanoate is an organic compound with the following percentage

54,55% C ; 9,09% H ; 36,36% O

The molar mass of the compound is 88 g∙mol-1.

6.1.1 Define the term empirical formula. (2)

6.1.2 Determine, by calculation, the empirical formula. (6)

6.1.3 Determine the molecular formula. (2)

6.2 Learners prepare a solution of sodium hydroxide (NaOH) in water by placing
8 g of sodium hydroxide (NaOH) in a volumetric flask and adding water to
produce 250 cm3 of solution after stirring.

6.2.1 Define concentration in words. (2)

6.2.2 Calculate the concentration of the sodium hydroxide (NaOH) solution. (4)

6.3 Sodium azide (NaN3) is used in car airbags. For the airbag to inflate the following reaction must take place:

2 NaN3 (s) → 2 Na (s) + 3 N2 (g)

Calculate the volume of nitrogen gas (N2) that would be produced at STP if
55 g of sodium azide reacts completely. (5)


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