CHAPTER 19. QUANTITATIVE ASPECTS OF CHEMICAL CHANGE 19.4
c. The learner then takes 300 cm^3 of a 0 , 1 mol·dm−^3 solution of sul-
phuric acid (H 2 SO 4 ) and adds it to 200 cm^3 of a 0 , 5 mol·dm−^3 solu-
tion of NaOH at 250 C.
d. Write down a balanced equation for the reaction which takes place
when these two solutions are mixed.
e. Calculate the number of moles of H 2 SO 4 which were added to the
NaOH solution.
16. 96 , 2 g sulphur reacts with an unknown quantity of zinc according to the
following equation: Zn+S→ZnS
a. What mass of zinc will you need for the reaction, if all the sulphur is
to be used up?
b. Calculate the theoretical yield for this reaction.
c. It is found that 275 g of zinc sulphide was produced. Calculate the %
yield.
17. Calcium chloride reacts with carbonic acid to produce calcium carbonate
and hydrochloric acid according to the following equation:
CaCl 2 +H 2 CO 3 →CaCO 3 + 2HCl
If you want to produce 10 g of calcium carbonate through this chemical
reaction, what quantity (in g) of calcium chloride will you need at the start
of the reaction?More practice video solutions or help at http://www.everythingscience.co.za(1.) 0088 (2.) 0089 (3.) 008a (4.) 008b (5.) 008c (6.) 008d
(7.) 008e (8.) 008f (9.) 008g (10.) 008h (11.) 008i (12.) 008j
(13.) 008k (14.) 008m (15.) 008n (16.) 008p (17.) 008qChemistry: Chemical change 363