Window glass is typically made by mixing soda ash (Na2 CO3), limestone (CaCO3), and silica sand

step 1 The composition of window glass consists of about 12 % NA2O by mass, 13 % CAO by mass, and 75 %

Window glass is typically made by mixing soda ash (Na2 CO3),...

Window glass is typically made by mixing soda ash $\left(\mathrm{Na}_{2} \mathrm{CO}_{3}\right),$ limestone $\left(\mathrm{CaCO}_{3}\right),$ and silica sand $\left(\mathrm{SiO}_{2}\right)$ and then heating to 1500 ' $\mathrm{C}$ to drive off $\mathrm{CO}_{2}$ from the $\mathrm{Na}_{2} \mathrm{CO}_{3}$ and $\mathrm{CaCO}_{3} .$ The resultant glass consists of about 12$\% \mathrm{Na}_{2} \mathrm{O}$ by mass, 13$\% \mathrm{CaO}$ by mass, and 75$\% \mathrm{SiO}_{2}$ by mass. How much of each reactant would you start with to prepare 0.35 $\mathrm{kg}$ of glass?

Key Concepts

Stoichiometry

Stoichiometry is the quantitative relationship between reactants and products in a chemical reaction. It allows one to calculate how much of each starting material is required to yield a certain amount of product by using balanced chemical equations and the mole concept, ensuring that the law of conservation of mass is satisfied.

Mass Percent Composition

Mass percent composition describes the proportion by mass of each component in a mixture or compound. In processes like glass-making, where the final product is composed of various oxides, this concept is used to determine how much of each oxide is present in the product and, conversely, how much of each precursor is needed to achieve the desired composition.

Molecular Weight and Molar Conversions

Molecular weight and molar conversions involve converting between the mass of a substance and the number of moles using its molar mass. This is essential in reactions where chemical formulas are used to relate different compounds, enabling precise calculations of reactant quantities required based on molecular relationships.

Thermal Decomposition Reactions

Thermal decomposition reactions are processes in which a chemical compound breaks down into simpler substances when heated. This concept is key in understanding processes like glass formation, where starting materials decompose to produce desired oxides while releasing gaseous by-products, thereby influencing the calculation of the initial reactant amounts needed to obtain the specified oxide composition.

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