Calculate the following quantities: (b) number of moles of NH₄Cl in 86.6 g of this substance

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Identify the molar mass of NH_4Cl by adding the atomic masses of nitrogen (N), hydrogen (H), and chlorine (Cl).

Calculate the molar mass: N (14.01 g/mol) + 4 * H (1.01 g/mol) + Cl (35.45 g/mol).

Add these values to find the total molar mass of NH_4Cl.

Use the formula: number of moles = mass (g) / molar mass (g/mol).

Substitute the given mass (86.6 g) and the calculated molar mass into the formula to find the number of moles.

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주요 개념

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Molar Mass

Molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol). It is calculated by summing the atomic masses of all the atoms in a molecule. For ammonium chloride (NH4Cl), the molar mass is approximately 53.49 g/mol, which is essential for converting grams of a substance to moles.

Mole Concept

The mole is a fundamental unit in chemistry that quantifies the amount of substance. One mole contains Avogadro's number of entities (approximately 6.022 x 10^23), allowing chemists to relate mass to the number of particles. Understanding the mole concept is crucial for performing stoichiometric calculations, such as converting grams to moles.

Stoichiometry

Stoichiometry is the area of chemistry that deals with the relationships between the quantities of reactants and products in chemical reactions. It allows for the calculation of moles, mass, and volume in reactions. In this context, stoichiometry is used to determine how many moles of NH4Cl are present in a given mass, facilitating the understanding of chemical quantities.

Calculate the following quantities: (b) number of moles of NH4Cl in 86.6 g of this substance