What amounts do you compare when measuring concentration

Chemistry

1 answer:

ozzi3 years ago

7 0

Answer:

When measuring concentration you compare the amount of solute to the amount of solvent or solution.

Explanation:

The concentration is a measure of how much solute is present in certain amount of solvent or solution. There are many quantitative expressions for the concentration. Some of those expressions are: percentage, molarity, molality, molar fraction, among others.

This table shows the expressions for some concentration measures, showing the amounts compared.

Concentration amounts compared in form of ratio

Percentage, mass/mass (mass of solute / mass of solution) × 100

Percentage, vol./vol. (vol. of solue / vol. of solution) × 100

Molarity (moles of solute / liters of solution)

Molality (moles of solute / Kg of solvent)

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How many moles are in 7.2x10^15 atoms of Pb?

fiasKO [112]

<h3>Answer:</h3>

1.2 × 10⁻⁸ mol Pb

<h3>General Formulas and Concepts:</h3>

Math

Pre-Algebra

Order of Operations: BPEMDAS

Brackets
Parenthesis
Exponents
Multiplication
Division
Addition
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Left to Right

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Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.

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<h3>Explanation:</h3>

Step 1: Define

[Given] 7.2 × 10¹⁵ atoms Pb

Step 2: Identify Conversions

Avogadro's Number

Step 3: Convert

[DA] Set up: $\displaystyle 7.2 \cdot 10^{15} \ atoms \ Pb(\frac{1 \ mol \ Pb}{6.022 \cdot 10^{23} \ atoms \ Pb})$
[DA] Multiply/Divide [Cancel out units]: $\displaystyle 1.19562 \cdot 10^{-8} \ mol \ Pb$