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This page contains Stoichiometry revision questions and answers. In chemistry, stoichiometry involves the use of relationships between reactants and products in a chemical reaction to determine desired quantitative data.
Stoichiometry questions and answers (Page 3) Question 1 Copper reacts with concentrated nitric acid as shown by the equation below: Cu(s) + 4HNO3(aq) → Cu(NO3)2(aq) + 2NO2(g) + 2H2O(l) Suggest one observation made when copper reacts with concentrated nitric acid. (i) Suggest the name of the salt of formula Cu(NO3)2. (ii) Using the equation, determine…
Chemistry calculations (O level) This post is about answering O level chemistry calculations questions which are part of stoichiometry. To fully understand these calculations you should be familiar with: how to use the periodic table relative molecular mass molar mass moles concentration valency These questions are compatible with Zimsec O level Chemistry and Combined science….
Stoichiometry Questions and Answers(Page 2) Question 1 Sodium sulphate has the following composition by mass: sodium 32.4%, sulphur 22.5% and oxygen 45.1%. What is its empirical formula? Solution 1 Sodium Sulphur Oxygen Mass 32.4 22.5 45.1 Moles 32.4/23 22.5/32 45.1/16 = 1.41 = 0.7 = 2.82 Molar Ratio 1.41/0.7 0.7/0.7 2.82/0.7 = 2 = 1…
Stoichiometry Questions and Answers (Page 1) Use the values of Ar which follow to answer the questions below. [H = 1; C = 12; N = 14; O = 16; Ne = 20; Na = 23; Mg = 24; S = 32; K = 39; Fe = 56; Cu = 63.5; Zn = 65. ]…
