Oxygen can be prepared by the decomposition of potassium chlorate (KClO3). How many moles of oxygen (O2(g)) can be formed by taking 12 moles of potassium chlorate (KClO3) according to the following equation?2KClO3(l) + heat --> 2KCl(s) + 3O2(g)
Correct answer: C. 18 moles of oxygen
- A. 12 moles of oxygen
- B. 15 moles of oxygen
- C. 18 moles of oxygen
- D. 21 moles of oxygen
Explanation
Option C is correct. The balanced chemical equation is: 2 KClO3(l) + heat → 2 KCl(s) + 3 O2(g). This indicates that for every 2 moles of KClO3, 3 moles of O2 are produced. To find out how many moles of O2 are produced from 12 moles of KClO3, we set up the following calculation: 12 moles KClO3 * (3 moles O2 / 2 moles KClO3) = 18 moles O2. Therefore, the answer is 18 moles of oxygen. The other options are incorrect because they do not align with the stoichiometry of the reaction. Specifically, options A, B, and D propose amounts of O2 that exceed or do not reach the correct product ratio based on the given moles of KClO3.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About s-Block and p-Block Elements
The s and p blocks are studied through their valence-shell configurations, periodic trends and characteristic chemical properties. Work covers the reactions of Group I and Group II elements, the behaviour of Group IV elements, and how atomic size, ionization energy, electronegativity and metallic character change across periods and down groups.
Practise s-Block and p-Block Elements
1,359 free s-Block and p-Block Elements MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Chemistry questions like this
Chemistry is on 14 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More s-Block and p-Block Elements questions
All alkali metals react with chlorine gas to form white metal chloride salt. The metal chloride salt formed is:
The electronic configurations of some elements are given below. Recognize the element that belongs to group IIIA
Select the metal that is extracted from bauxite.
In the redox reaction of SO2 with KMnO4 for an acidic medium:
Magnesium oxide is used in the making of the lining of the blast furnace.It is extracted from seawater as follows. Aqueous seawater is added to seawater. Ca(OH)2(aq)+MgCl2 (aq)-------->Mg (OH)2(s) + CaCl2 (aq). The magnesium hydroxide is then filtered off and roasted. Which of the following comparisons between calcium and magnesium explains why magnesium hydroxide forms?
The melting point of NaCi is very high 801°,it is reduced to 600°C, it is by in Down's process