Determine the number of moles of compound and the number of...

Determine the number of moles of compound and the number of moles of each type of atom in each of the following: (a) 25.0 g of propylene, $\mathrm{C}_{3} \mathrm{H}_{6}$ (b) $3.06 \times 10^{-3} \mathrm{g}$ of the amino acid glycine, $\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{NO}_{2}$ (c) 25 $\mathrm{lb}$ of the herbicide Treflan, $\mathrm{C}_{13} \mathrm{H}_{16} \mathrm{N}_{2} \mathrm{O}_{4} \mathrm{F}(1 \mathrm{lb}=454 \mathrm{g})$ (d) 0.125 $\mathrm{kg}$ of the insecticide Paris Green, $\mathrm{Cu}_{4}\left(\mathrm{AsO}_{3}\right)_{2}\left(\mathrm{CH}_{3} \mathrm{CO}_{2}\right)_{2}$ (e) 325 $\mathrm{mg}$ of aspirin, $\mathrm{C}_{6} \mathrm{H}_{4}\left(\mathrm{CO}_{2} \mathrm{H}\right)\left(\mathrm{CO}_{2} \mathrm{CH}_{3}\right)$

Determine the number of moles of compound and the number of moles of each type of atom in each of the following:
(a) 25.0 g of propylene, $\mathrm{C}_{3} \mathrm{H}_{6}$
(b) $3.06 \times 10^{-3} \mathrm{g}$ of the amino acid glycine, $\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{NO}_{2}$
(c) 25 $\mathrm{lb}$ of the herbicide Treflan, $\mathrm{C}_{13} \mathrm{H}_{16} \mathrm{N}_{2} \mathrm{O}_{4} \mathrm{F}(1 \mathrm{lb}=454 \mathrm{g})$
(d) 0.125 $\mathrm{kg}$ of the insecticide Paris Green, $\mathrm{Cu}_{4}\left(\mathrm{AsO}_{3}\right)_{2}\left(\mathrm{CH}_{3} \mathrm{CO}_{2}\right)_{2}$
(e) 325 $\mathrm{mg}$ of aspirin, $\mathrm{C}_{6} \mathrm{H}_{4}\left(\mathrm{CO}_{2} \mathrm{H}\right)\left(\mathrm{CO}_{2} \mathrm{CH}_{3}\right)$

Key Concepts

Molecular Formula Analysis

Molecular formula analysis involves interpreting the chemical formula of a compound to determine the number of atoms of each element present in one molecule. This is essential for calculating the moles of individual elements in a compound from the moles of the compound itself, which is fundamental in many stoichiometric calculations.

Stoichiometry

Stoichiometry involves the quantitative relationships between reactants and products in a chemical reaction based on their chemical formulas. It uses moles as a counting unit to determine, for example, how many atoms of each element are present in a compound and how those atoms interact in chemical reactions.

Unit Conversion

Unit conversion is a key mathematical tool in chemistry that involves converting between different measurement units, such as grams, milligrams, pounds, and kilograms. Accurate unit conversion is crucial when calculating moles and ensuring that the masses used in stoichiometric calculations are consistently expressed in compatible units.

Mole Concept

The mole concept is a fundamental principle in chemistry that relates a quantity of substance to an exact number of elementary entities, typically atoms or molecules. It allows chemists to count particles by weighing them and is based on the idea that one mole of any substance contains the same number of particles, Avogadro's number (approximately 6.022 x 10^23).

Molar Mass

Molar mass is the mass of one mole of a substance, usually expressed in grams per mole (g/mol). It is calculated by summing the atomic masses of all atoms in a compound. This concept is essential for converting between a substance’s mass and the number of moles, enabling quantitative comparisons and chemical calculations.

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