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If 3 moles of C_5H_{12} are reacted completely with excess oxygen, how many moles of CO_2 are produced?
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3. Chemical Reactions
Stoichiometry
Multiple Choice
When one formula unit of CaCl_2 dissolves completely in water, how many individual ions are produced?
A
2 ions
B
3 ions
C
4 ions
D
1 ion
검증된 단계별 안내1
Identify the chemical formula of the compound: CaCl_2 consists of one calcium ion (Ca^{2+}) and two chloride ions (Cl^{-}).
Understand that when CaCl_2 dissolves in water, it dissociates completely into its constituent ions.
Write the dissociation equation: \(\text{CaCl}_2 (s) \rightarrow \text{Ca}^{2+} (aq) + 2\text{Cl}^{-} (aq)\).
Count the total number of ions produced from one formula unit: 1 Ca^{2+} ion + 2 Cl^{-} ions = 3 ions.
Conclude that dissolving one formula unit of CaCl_2 produces 3 individual ions in solution.
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