Chemistry (only formulas)

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9 Terms

1
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How to find atomic mass with isotope and abundances

(Mass #1)(% #1) + (Mass #2)(% #2) /100

<p>(Mass #1)(% #1) + (Mass #2)(% #2) /100</p>
2
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How to find atomic mass with mass spectrum image

(Mass #1)(% #1) + (Mass #2)(% #2) /sum of percentages

<p>(Mass #1)(% #1) + (Mass #2)(% #2) /sum of percentages</p>
3
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How to calculate how many moles are in ______ atoms?

Atoms → Moles = Divide by Avogadro's number (6.022 ×1023)

4
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How to calculate how many moles from a given element mass

Mass → Moles = Divide by molar mass.

5
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How to calculate how many atoms from a given element mass.

Mass → Atoms = First divide by molar mass, then multiply by Avogadro’s number.

6
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How to find the molecular formula

Formula mass/ Empirical Formula

<p>Formula mass/ Empirical Formula</p>
7
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How to calculate how many molecules are from the given mass of a compound

Given mass of compound/molar mass of compound x Avragados number (6.022 × 1023)

<p>Given mass of compound/molar mass of compound x Avragados number (6.022 × 10<sup>23)</sup></p>
8
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How to find percent composition of a element from a given compound

Total mass of the element we are trying to find/ Molecular mass x100

9
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How to calculate mass of compound when given mass of element and percentage composition

mass of element/ percentage x 100

<p>mass of element/ percentage x 100</p>