Pregunta
Order the steps for calculating the atoms of an element present in a compound. \[ \begin{array}{c}\text { Calculate the moles from the conversion of the } \\ \text { molar mass and grams of the sample } \\ \text { Convert moles to atoms using Avogadro's } \\ \text { number } \\ \text { Calculate the molar mass of the compound } \\ \text { Calate the moles of each element present in } \\ \text { the compound. }\end{array} \]
Ask by Bowers Burns. in the United States
Mar 11,2025
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1. **Calculate the molar mass of the compound.**
2. **Determine the moles of the compound from the given mass.**
3. **Find the moles of each element in the compound using its stoichiometric coefficients.**
4. **Convert the moles of each element to the number of atoms using Avogadro's number.**
Solución
1. **Calculate the molar mass of the compound.**
Determine the total mass of all the atoms in one mole of the compound using the atomic masses from the periodic table.
2. **Calculate the moles from the conversion of the molar mass and grams of the sample.**
Use the relation
\[
n = \frac{m}{M}
\]
where \( n \) is the number of moles, \( m \) is the mass of the sample, and \( M \) is the molar mass obtained in step 1.
3. **Calculate the moles of each element present in the compound.**
Utilize the stoichiometric ratios from the chemical formula of the compound to find the moles of the individual elements.
4. **Convert moles to atoms using Avogadro's number.**
Apply the conversion
\[
N = n \times N_A
\]
where \( N \) is the number of atoms, \( n \) is the number of moles (from step 2 or step 3), and \( N_A \) is Avogadro's number \(\,(6.022 \times 10^{23} \text{ atoms/mol})\).
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Bonus Knowledge
First, calculate the molar mass of the compound. This provides the essential information needed for performing further calculations on the substance. It's crucial to sum the atomic masses of all elements present in the compound based on their respective proportions. Next, calculate the moles from the conversion of the molar mass and grams of the sample. This step helps you determine how many moles of the compound you have based on the mass you started with, setting the stage for converting those moles into the number of atoms in the next steps.

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