Chapter 4, Problem 89GQ

### Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

Chapter
Section

### Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

# Silicon and hydrogen form a series of compounds with the general formula SixHy. To find the formula of one of them, a 6.22-g sample of the compound is burned in oxygen. All of the Si is converted to 11.64 g of SiO2, and all of the H is converted to 6.980 g of H2O. What is the empirical formula of the silicon compound?

Interpretation Introduction

Interpretation:

The empirical formula of silicon compound in the given sample has to be determined.

Concept introduction:

• Empirical formula of a compound represents the smallest whole number relative ratio of elements in that compound.
• Equation for finding Molecular formula from the empirical formula,

MolarmassEmpiricalformula mass × Empirical formula

• The molar mass of an element or compound is the mass in grams of 1 mole of that substance, and it is expressed in the unit of grams per mol (g/mol).
Explanation

Herein 6.22â€‰g of silicon compound burns in oxygen then give 11.64â€‰g of SiO2 and 6.980â€‰g of H2O

From the given masses the amount of SiO2â€‰andâ€‰H2O can be calculated.

Thus, amount of SiO2â€‰andâ€‰H2O are,

â€‚Â 11.64â€‰gâ€‰â€‰SiO2â€‰Ã—â€‰1â€‰molâ€‰SiO2â€‰60.08â€‰gâ€‰SiO2â€‰=â€‰0.1937â€‰â€‰molâ€‰SiO26.980â€‰â€‰gâ€‰H2Oâ€‰Ã—1â€‰molâ€‰H2O18.015â€‰gâ€‰H2Oâ€‰=â€‰0.3874â€‰â€‰molâ€‰H2O

For every mole of SiO2 isolated, 1 mol of Si must have been present in the silicon compound.

So,

â€‚Â 0.1937â€‰â€‰molâ€‰SiO2â€‰Ã—1â€‰molâ€‰Siâ€‰inâ€‰menthol1â€‰molâ€‰SiO2â€‰=â€‰0

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