Pure oxygen was first made by heating mercury(II) oxide: HgO Heat ⟶ Hg+O2 Unbalanced (a) Bala

step 1 First, we need to balance reaction. It helps to start with the diatomic atom first. So for every

Pure oxygen was first made by heating mercury(II) oxide: HgO...

Pure oxygen was first made by heating mercury(II) oxide: $\mathrm{HgO} \stackrel{\text { Heat }}{\longrightarrow} \mathrm{Hg}+\mathrm{O}_{2} \quad$ Unbalanced (a) Balance the equation. (b) How many grams of mercury and how many grams of oxygen are formed from 45.5 $\mathrm{g}$ of HgO? (c) How many grams of HgO would you need to obtain 33.3 $\mathrm{g}$ of $\mathrm{O}_{2} ?$

Pure oxygen was first made by heating mercury(II) oxide:
$\mathrm{HgO} \stackrel{\text { Heat }}{\longrightarrow} \mathrm{Hg}+\mathrm{O}_{2} \quad$ Unbalanced
(a) Balance the equation.
(b) How many grams of mercury and how many grams of oxygen are formed from 45.5 $\mathrm{g}$ of HgO?
(c) How many grams of HgO would you need to obtain 33.3 $\mathrm{g}$ of $\mathrm{O}_{2} ?$

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Key Concepts

Balancing Chemical Equations

Balancing chemical equations ensures that the law of conservation of mass is upheld in a chemical reaction by making sure the number of atoms for each element is the same on both the reactant and product sides. This process is fundamental to predicting the quantitative relationships between substances in any chemical reaction.

Mole Concept

The mole concept serves as a bridge between the microscopic world of atoms and molecules and the macroscopic world of grams and liters, allowing chemists to count particles by weighing them. It is essential for converting between mass and number of particles using Avogadro's number.

Molar Mass

Molar mass is defined as the mass of one mole of a substance, typically expressed in grams per mole. It provides a crucial conversion factor in stoichiometric calculations by linking the mass of a substance to the number of moles present.

Stoichiometry

Stoichiometry involves the quantitative analysis of reactants and products in a chemical reaction. It uses the balanced chemical equation and the mole concept to determine the mass relationships between substances, predict yields, and calculate the necessary amounts of reactants or products.

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