Question

Suppose you have a compound which has an empirical formula of C4H5N2O and molar mass of 194 g/mol. What is the compounds molecular formula?

Answer 1

Answer:

C₈H₁₀N₄O₂

Explanation:

Step 1: Given data

• Empirical formula of the compound: C₄H₅N₂O

• Molar mass of the molecular formula: 194 g/mol

Step 2: Determine the molar mass of the empirical formula

The molar mass is equal to the sum of the masses of the elements that form it.

M = 4 × C + 5 × H + 2 × N + 1 × O

M = 4 × 12.01 g/mol + 5 × 1.01 g/mol + 2 × 14.0 g/mol + 1 × 16.0 g/mol

M = 97.09 g/mol ≈ 97 g/mol

Step 3: Calculate "n"

n = molar mass of the molecular formula / molar mass of the empirical formula

n = (194 g/mol)/(97 g/mol) = 2

Step 4: Determine the molecular formula

To determine the molecular formula, we have to multiply the empirical formula by "n".

C₄H₅N₂O × 2 = C₈H₁₀N₄O₂

Answer 2

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