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A compound has the following skeletal formula - VCE - SSCE Chemistry - Question 3 - 2019 - Paper 1
Question 3
A compound has the following skeletal formula. The molar mass of the compound is A. 71 g mol⁻¹ B. 74 g mol⁻¹ C. 85 g mol⁻¹ D. 86 g mol⁻¹
Worked Solution & Example Answer:A compound has the following skeletal formula - VCE - SSCE Chemistry - Question 3 - 2019 - Paper 1
Step 1
Determine the Molecular Formula from the Skeletal Structure
Answer
The skeletal formula shows a molecule with one oxygen atom and two carbon atoms, derived from the visual structure. The compound appears to be an alcohol or a carbonyl compound. To proceed, consider the hydrogen atoms that complete the valences of carbon and oxygen.
Step 2
Calculate the Molar Mass
Answer
Estimate the total molar mass by adding the molar masses of each atom:
- Carbon (C): 12 g mol⁻¹ × 2 = 24 g mol⁻¹
- Hydrogen (H): 1 g mol⁻¹ × 6 = 6 g mol⁻¹
- Oxygen (O): 16 g mol⁻¹ × 1 = 16 g mol⁻¹
Total molar mass = 24 g mol⁻¹ + 6 g mol⁻¹ + 16 g mol⁻¹ = 46 g mol⁻¹.
The specific molar mass might indicate the presence of some functional groups in the compound, leading to a potential re-evaluation for accurate selection among the provided options.
Step 3