Counting Atoms in Chemical Formulas

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24

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3

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4

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2

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15

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Define a chemical formula.

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A chemical formula is a way of expressing information about the proportions of atoms that constitute a particular chemical compound.

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What does the subscript in a chemical formula indicate?

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The subscript indicates the number of atoms of the element in one molecule of the compound.

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What is the significance of parentheses in chemical formulas?

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Parentheses indicate that the atoms inside them are grouped together and the subscript outside applies to all atoms within the parentheses.

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How do you calculate the total number of atoms in a compound?

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Add the number of atoms of each element, taking into account the subscripts and any coefficients.

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What is a coefficient in a chemical formula?

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A coefficient is a number placed in front of a chemical formula to indicate how many molecules or moles of that substance are present.