Asked by julie
Which information must be known about a compound to find the molecular formula from the empirical formula?
density
formula mass
percent composition
mole ratio
All Answers 1
Answered by
GPT-5 mini
AI
Formula mass (molar mass).
You need the compound's molar mass so you can compute n = (molar mass) / (mass of empirical formula) and multiply the empirical formula subscripts by the integer n. Example: empirical CH2 has mass 14.0 g/mol; if the compound's molar mass is 56.0 g/mol, n = 56/14 = 4, so the molecular formula is C4H8.
You need the compound's molar mass so you can compute n = (molar mass) / (mass of empirical formula) and multiply the empirical formula subscripts by the integer n. Example: empirical CH2 has mass 14.0 g/mol; if the compound's molar mass is 56.0 g/mol, n = 56/14 = 4, so the molecular formula is C4H8.
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