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2 years ago

how can you find the common denominator and least commom denominator?? Help and thx i accedentaly clicked on the wrong subject

1 answer:

7 0

Common denominator - Find the Least Common Multiple of the denominators (which is called the Least Common Denominator).

Change each fraction (using equivalent fractions) to make their denominators the same as the least common denominator.

Then add (or subtract) the fractions, as we wish!

Least common denominator - You do the same thing for the common denominator

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What is the mass of 1.24 x 10^23 molecules of N2O2

Scorpion4ik [409]

<h3>Answer:</h3>

12.4 g N₂O₂

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

<u>Chemistry</u>

<u>Atomic Structure</u>

Reading a Periodic Table
Moles
Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.

<u>Stoichiometry</u>

Using Dimensional Analysis

<h3>Explanation:</h3>

<u>Step 1: Define</u>

[Given] 1.24 × 10²³ molecules N₂O₂

[Solve] grams N₂O₂

<u>Step 2: Identify Conversions</u>

Avogadro's Number

[PT] Molar Mass of N - 14.01 g/mol

[PT] Molar Mass of O - 16.00 g/mol

Molar Mass of N₂O₂ - 2(14.01) + 2(16.00) = 60.02 g/mol

<u>Step 3: Convert</u>

[DA] Set up: $\displaystyle 1.24 \cdot 10^{23} \ molecules \ N_2O_2(\frac{1 \ mol \ N_2O_2}{6.022 \cdot 10^{23} \ molecules \ N_2O_2})(\frac{60.02 \ g \ N_2O_2}{1 \ mol \ N_2O_2})$
[DA] Divide/Multiply [Cancel out units]: $\displaystyle 12.3588 \ g \ N_2O_2$

<u>Step 4: Check</u>

<em>Follow sig fig rules and round. We are given 3 sig figs.</em>

12.3588 g N₂O₂ ≈ 12.4 g N₂O₂

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