The molecular formula for the silicon-fluorine compound from the mass percentage is to be determined. Concept introduction: The formula to find an amount(mol) is: Amount ( mol ) = mass molar mass (1) An empirical formula gives the simplest whole number ratio of atoms of each element present in a compound. The molecular formula tells the exact number of atoms of each element present in a compound. Following are the steps to determine the molecular formula of a compound. Step 1: Add the molar mass of each element multiplied by its number of atoms present in the empirical formula to obtain the empirical formula mass for the compound. Step 2: Divide the molar mass of the compound by its empirical formula mass to obtain the whole number. The formula to calculate the whole number multiple is as follows: Whole − number multiple = Molar mass of compound Empirical formula mass (2) Step 3: Multiply the whole number with the subscript of each element present in the empirical formula. This gives the molecular formula of the compound.

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Chapter 5, Problem 5.111P

Interpretation Introduction

Interpretation:

The molecular formula for the silicon-fluorine compound from the mass percentage is to be determined.

Concept introduction:

The formula to find an amount(mol) is:

Amount(mol)=massmolar mass (1)

An empirical formula gives the simplest whole number ratio of atoms of each element present in a compound. The molecular formula tells the exact number of atoms of each element present in a compound.

Following are the steps to determine the molecular formula of a compound.

Step 1: Add the molar mass of each element multiplied by its number of atoms present in the empirical formula to obtain the empirical formula mass for the compound.

Step 2: Divide the molar mass of the compound by its empirical formula mass to obtain the whole number. The formula to calculate the whole number multiple is as follows:

Whole−number multiple=Molar mass of compoundEmpirical formula mass (2)

Step 3: Multiply the whole number with the subscript of each element present in the empirical formula. This gives the molecular formula of the compound.

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