A polymer of empirical formula CH2 has molar mass of 28000g mol-1. Its molecular formula will be
Correct answer: D. 2000 times that of its empirical formula
- A. 100 times that of its empirical formula
- B. 200 times that of its empirical formula
- C. 500 times that of its empirical formula
- D. 2000 times that of its empirical formula
Explanation
The empirical mass of CH4 is 12+2=14g. Dividing molar mass by observed mass will give us the answer: 28000/14=2000 times. As it is numerical, it can have only one possible answer.
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 molarity of pure water is:
The volume occupied by 1.4g N2 at STP is:
Jimmy went to a hospital to take some laboratory tests. After he had gotten the result, he found out that the count of his red blood cells was 2.7 x 10^6/uL. The doctor said that the normal adult male hemoglobin count is 13.5/100 mL. A low hemoglobin count would result in anemia, and a high hemoglobin count would result in polycythemia. If you were the doctor, identify the condition of Jimmy. Hemoglobin is (C2952H4664O832S8Fe4). One red blood cell has approximately 270 million hemoglobin molecules.
The number of molecules in 9g of ice (H2O) is:
1.2 g of Mg was dropped in 100 ml of 0.1 M HCl solution. Calculate the volume of H2 obtained by STP.
At 100 C° and 1 atm, if the density of liquid water is 1g cm-3 and that of water vapour is 0.0006 g cm-3, then the volume occupied by water molecules in 1 litre of steam at that temperature is: