Determine the number of moles (of molecules or formula units) in each sample. b. 23.6 kg Fe(NO₃)₂

검증된 단계별 안내

Convert the mass of the sample from kilograms to grams. Since 1 kg = 1000 g, multiply 23.6 kg by 1000 to get the mass in grams.

Calculate the molar mass of Fe(NO_3)_2. To do this, add the atomic masses of all the atoms in the formula: Fe, N, and O. Use the periodic table to find these atomic masses.

The molar mass of Fe(NO_3)_2 is the sum of the atomic masses: 1 Fe, 2 N, and 6 O. Calculate this value.

Use the formula: number of moles = mass (g) / molar mass (g/mol). Substitute the mass in grams and the molar mass you calculated into this formula.

Solve the equation to find the number of moles of Fe(NO_3)_2 in the sample.

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주요 개념

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Moles and Avogadro's Number

A mole is a unit in chemistry that represents 6.022 x 10^23 entities, such as atoms or molecules. This concept is fundamental for converting between the mass of a substance and the number of moles, allowing chemists to quantify and compare amounts of different substances.

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 atoms in a molecule. For Fe(NO3)2, the molar mass is essential for converting the given mass (23.6 kg) into moles.

Unit Conversion

Unit conversion is the process of converting a quantity expressed in one set of units to another. In this context, it involves converting kilograms to grams (1 kg = 1000 g) to facilitate the calculation of moles from mass using the molar mass of Fe(NO3)2.

Determine the number of moles (of molecules or formula units) in each sample. b. 23.6 kg Fe(NO3)2