   Chapter 10, Problem 73GQ

Chapter
Section
Textbook Problem

There are five compounds in the family of sulfur-fluorine compounds with the general formula SxFy. One of these compounds is 25.23% S. If you place 0.0955 g of the compound in a 89-mL flask at 45 °C, the pressure of the gas is 83.8 mm Hg. What is the molecular formula of SxFy?

Interpretation Introduction

Interpretation: For the given reaction conditions the molecular formula for the sulfur-fluorine compound should be determined.

Concept introduction:

Empirical formula: It is the simplest value that denotes the ratio of atoms present in chemical compound but not all the exact number of the types of atoms present in the compound.

Molecular formula: It is defined as the chemical formula which defines all the type and number of atoms present in the compound.

Explanation

Given:

General formula = SxFy%ofS=25.23Mass of the compound = 0.0955gVolume = 89 mLTemperature = 45CPressure = 83.8 mmHgMolecular formula = ?

Determine the moles of gas.

PV=nRTn=PVRT=83.8×0.8962.363×(273+45)=0

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