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What is the purpose of subscripts in chemical formulas?
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3. Chemical Reactions
Molecular Formula
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How many atoms of nitrogen (N) and hydrogen (H) are present in one molecule of hydrazine?
A
2 nitrogen atoms and 2 hydrogen atoms
B
1 nitrogen atom and 4 hydrogen atoms
C
2 nitrogen atoms and 4 hydrogen atoms
D
1 nitrogen atom and 2 hydrogen atoms
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Identify the chemical formula of hydrazine. Hydrazine is commonly represented as \(\mathrm{N_2H_4}\).
Analyze the formula to determine the number of each type of atom. The subscript after each element symbol indicates the number of atoms of that element in one molecule.
For nitrogen (N), look at the subscript next to N in \(\mathrm{N_2H_4}\). It is 2, meaning there are 2 nitrogen atoms in one molecule of hydrazine.
For hydrogen (H), look at the subscript next to H in \(\mathrm{N_2H_4}\). It is 4, meaning there are 4 hydrogen atoms in one molecule of hydrazine.
Conclude that one molecule of hydrazine contains 2 nitrogen atoms and 4 hydrogen atoms.
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