What is the amount, in moles, of each elemental sample? a. 23.2 g Kr

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Identify the molar mass of krypton (Kr) from the periodic table. The molar mass of Kr is approximately 83.8 g/mol.

Use the formula for moles: \( \text{moles} = \frac{\text{mass (g)}}{\text{molar mass (g/mol)}} \).

Substitute the given mass of krypton (23.2 g) and the molar mass of krypton (83.8 g/mol) into the formula.

Calculate the division to find the number of moles of krypton.

The result will give you the amount of krypton in moles.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Molar Mass

Molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol). For elements, it corresponds to the atomic weight found on the periodic table. For example, the molar mass of krypton (Kr) is approximately 83.8 g/mol, which is essential for converting grams to moles.

Conversion from Grams to Moles

To find the number of moles from a given mass in grams, the formula used is: moles = mass (g) / molar mass (g/mol). This relationship allows chemists to relate the mass of a substance to the amount of substance in moles, facilitating stoichiometric calculations in chemical reactions.

Stoichiometry

Stoichiometry is the area of chemistry that deals with the quantitative relationships between the reactants and products in a chemical reaction. Understanding stoichiometry is crucial for calculating how much of each substance is involved in a reaction, which is often based on the mole concept and molar mass.

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