Calculate the mass in grams of each of the following...

Calculate the mass in grams of each of the following samples. a. 2.41 millimol of potassium nitrate (1 millimol $=$ $1 / 1000 \mathrm{mol})$ b. 8.91 mol of ethanol, $\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}$ c. 0.0141 mol of calcium oxide d. $1.91 \mathrm{mol}$ of gold(III) bromide e. 0.0000117 mol of water f. 2.68 mol of silver nitrate

Calculate the mass in grams of each of the following samples.
a. 2.41 millimol of potassium nitrate (1 millimol $=$ $1 / 1000 \mathrm{mol})$
b. 8.91 mol of ethanol, $\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}$
c. 0.0141 mol of calcium oxide
d. $1.91 \mathrm{mol}$ of gold(III) bromide
e. 0.0000117 mol of water
f. 2.68 mol of silver nitrate

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Key Concepts

Unit Conversion

Unit conversion involves changing one unit of measurement to another while preserving the quantity’s value, which is especially important in chemistry when dealing with different scales such as millimoles and moles. In chemical calculations, converting units like millimoles to moles, or vice versa, ensures that the correct values are used when applying formulas, such as calculating mass using the product of moles and molar mass.

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 adding together the atomic masses of all the atoms present in the molecular formula of the substance. This property is crucial for converting between the amount of a substance in moles and its mass, which is a common task in chemical computations and stoichiometry.

Mole Concept

The mole is a fundamental unit in chemistry that represents a specific number of particles, typically atoms or molecules, based on Avogadro's number, which is approximately 6.022×10^23. It serves as a bridge between the atomic scale and the macroscopic scale, allowing chemists to count entities by weighing a substance. This concept is essential for converting between the number of particles and the mass of substances in chemical calculations.

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