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Molecular Formulas Chapter 7-4, p. 232 - 233.

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Presentation on theme: "Molecular Formulas Chapter 7-4, p. 232 - 233."— Presentation transcript:

1 Molecular Formulas Chapter 7-4, p

2 Molecular Formula Defined as:
the actual formula of a molecular compound.

3 Molecular vs. Empirical Formulas
C2H4 (ethylene) and C3H6 (cyclopropane) have the same empirical formula (CH2) but are very different chemicals: ethylene is a gas used to ripen fruit, like bananas; cyclopropane was used as an anesthetic, until it was discovered it’s explosive when mixed with O2

4 Determining a Molecular Formula from an Empirical Formula
The relationship between a compound’s empirical formula and its molecular formula is… X (empirical formula) = molecular formula, where X is a whole number Also… X (empirical formula mass) = molecular formula, where X is a whole number

5 Example What is the molecular formula of diborane if its formula mass is g/mol, and the empirical formula is BH3? 10.81 g/mol + 3(1.01 g/mol)=13.84 g/mol (empirical formula mass) X = g/mol = = 2 13.84 g/mol 2(BH3) = B2H6

6 You Try It! P2O5 is the empirical formula of a compound. The molecular formula mass is g/mol. Find its molecular formula.

7 You Try It! Solution P2O5 is the empirical formula of a compound. The molecular formula mass is g/mol. Find its molecular formula. P2O5 = 2(30.97g/mol) + 5(16.00g/mol) = g/mol X = g/mol = = 2 g/mol 2(P2O5) = P4O10


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