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Chapter 3: Problem 5

Give the name and definition of the SI unit for amount of substance.

Short Answer

Expert verified
The SI unit for the amount of substance is the mole, defined as containing 6.022 x 10^23 entities.

Step by step solution

01

Identify the SI Unit Name

The SI unit for the amount of substance is called the mole.
02

Define the Mole

One mole is defined as the amount of substance that contains exactly 6.022 x 10^{23} elementary entities (such as atoms, molecules, ions, etc.). This number is known as Avogadro's number.
03

Explain the Concept

The mole is a fundamental unit in chemistry that allows scientists to count and quantify large numbers of small particles, like atoms and molecules, by converting them into measurable amounts.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Amount of Substance
The amount of substance is a key concept in chemistry that helps us understand and quantify the quantity of particles in a given sample. Instead of counting individual atoms or molecules, which would be nearly impossible due to their tiny size, chemists use the concept of "amount of substance". This allows them to group these particles into manageable units.
  • This concept is mainly used to count particles like atoms, ions, or molecules.
  • The amount of substance enables chemists to make precise measurements during chemical reactions.
By using the amount of substance, we can readily determine how substances interact in a reaction and predict the quantities of products and reactants involved. This simplifies complex chemical equations into understandable terms.
SI Unit
The International System of Units (SI) provides a standardized way to measure various physical quantities, including the amount of substance. The standard SI unit for the amount of substance is the mole, abbreviated as 'mol'.
  • The mole offers a bridge between the atomic scale and the macroscopic scale we observe in everyday life.
  • It allows us to convert the mass of a substance into the number of molecules or atoms it contains.
One of the most remarkable aspects of the mole is its universality in chemistry, making it an indispensable tool for chemists worldwide. By using moles, chemists can uniformly communicate and understand amounts of substances across different experiments and studies.
Avogadro's Number
Avogadro's number is a crucial component when working with the mole because it defines how many "elementary entities" are in one mole of a substance. Specifically, Avogadro's number is approximately 6.022 x 10^{23}.
  • This number is constant, just like how the number of inches per foot is constant.
  • It can be used to convert moles of a substance to the number of atoms, molecules, or ions.
Named after the Italian scientist Amedeo Avogadro, this number helps chemists connect the macro and microscopic worlds. It allows for precise calculations and is integral in stoichiometry, material analysis, and even understanding molecular structures.

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Most popular questions from this chapter

What is the empirical formula of a compound that contains \(0.139 \mathrm{~g}\) hydrogen and \(0.831 \mathrm{~g}\) carbon?

(a) Calculate the number of moles in \(9.40 \mathrm{~g} \mathrm{SO}_{2}\). (b) Calculate the mass in \(3.30 \mathrm{~mol} \mathrm{AlCl}_{3}\). (c) Calculate the number of moles in \(1.12 \times 10^{23}\) molecules of \(\mathrm{H}_{2} \mathrm{SO}_{4}\)

The reaction of \(9.66 \mathrm{~g} \mathrm{O}_{2}\) with \(9.33 \mathrm{~g}\) NO produces \(10.1 \mathrm{~g} \mathrm{NO}_{2}\). What is the percent yield?

(a) Write the equation for the combustion of \(\mathrm{C}_{4} \mathrm{H}_{8} \mathrm{O}\). (b) Calculate the mass of \(\mathrm{O}_{2}\) consumed in the combustion of a \(5.33-\mathrm{g}\) sample of \(\mathrm{C}_{4} \mathrm{H}_{8} \mathrm{O}\)

(a) Calculate the number of moles in \(14.3 \mathrm{~g} \mathrm{C}_{6} \mathrm{H}_{6}\) (b) Calculate the mass of \(0.0535 \mathrm{~mol} \mathrm{SiH}_{4}\). (c) Calculate the number of molecules in \(1.11 \mathrm{~g} \mathrm{H}_{2} \mathrm{O}\).
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