Silver oxide decomposes when heated to silver and oxygen. If 0.5 moles of lunar caustic is heated up to 450 degrees, giving out nitrogen dioxide and oxygen leaving silver as metal, what is the mass of the residue?
Correct answer: B. 54 grams
- A. 108 grams
- B. 54 grams
- C. 216 grams
- D. 27 grams
- E. 92 grams
Explanation
The decomposition of silver nitrate is represented by the balanced chemical equation:2AgNO3 → 2Ag + 2NO2 + O2This equation shows that 2 moles of silver nitrate produce 2 moles of silver. Therefore, 0.5 moles of silver nitrate will produce 0.5 moles of silver.Using the molar mass of silver (107.8 g/mol), the mass of silver produced is calculated as:mass = 0.5 moles * 107.8 g/mol = 53.9 g, rounded to 54 g.The other options result from incorrect assumptions or calculations in stoichiometry or molar mass application.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Fundamental Concepts of Chemistry
Mole calculations connect mass, number of particles and Avogadro's number, while balanced equations provide the mole ratios used in stoichiometry. Questions cover limiting and excess reactants, theoretical yield and percentage yield, including identifying which reactant is consumed first and comparing the actual product with the maximum possible product.
Practise Fundamental Concepts of Chemistry
894 free Fundamental Concepts of Chemistry 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 Fundamental Concepts of Chemistry questions
The empirical formula of Glucose C6H12O6 is:
The efficiency of chemical reaction can be expressed as:
What volume in dm3 of KCl is obtained in the following equation if the volume of KCIO3 at the beginning of the reaction is 20 dm3? 2KClO3 → 2KCl + 3O2
The molecular formula expresses:
Atomic number of carbon is 6 and hydrogen is 1, How many electrons are present In 1.6 grams of methane?
A compound was found to contain nitrogen and oxygen in the ratio 28g:80g. The formula of the compound is: