The empirical formula and molecular mass of a compound are CH₂O and 180 g/mol respectively. The molecular formula of the compound is:
Correct answer: C. C₆H₁₂O₆
- A. C₉H₁₈O₉
- B. CH₂O
- C. C₆H₁₂O₆
- D. C₂H₄O₂
Explanation
The mass of the empirical formula (CH₂O) is 30 g/mol. The ratio of the molecular mass to the empirical mass is 180/30 = 6. Multiplying the subscripts in the empirical formula by 6 gives (CH₂O)₆ = C₆H₁₂O₆.
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
On complete combustion, a 44-gram sample of a compound gives 88 grams of CO₂ and 36 grams of H₂O. The molecular formula of the compound may be:
Which of the following statements about alcohol oxidation is incorrect?
Which of the following compounds has the same molecular and empirical formula?
A chemical formula that shows the actual kinds and numbers of atoms present in one molecule of a compound is called the:
The formula which shows the simplest whole-number ratio for the atoms of different elements in a compound is called the:
The empirical formula for water is: