Multiple Choice
Which of the following is the correct chemical formula for phosphorus trichloride?
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3. Chemical Reactions
Naming Molecular Compounds
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Which of the following is the correct chemical formula for tetraphosphorus heptasulfide?
A
P2S7
B
P4S7
C
P7S4
D
P4S5
Verified step by step guidance1
Understand the naming convention for binary molecular compounds, which uses prefixes to indicate the number of atoms of each element in the compound. The prefix 'tetra-' means 4, and 'hepta-' means 7.
Identify the elements involved: 'phosphorus' corresponds to the symbol P, and 'sulfur' corresponds to the symbol S.
Apply the prefixes to the elements: 'tetraphosphorus' means 4 phosphorus atoms (P4), and 'heptasulfide' means 7 sulfur atoms (S7).
Combine the symbols and their respective numbers to write the chemical formula: P4S7.
Verify that the formula matches one of the given options, confirming that P4S7 is the correct chemical formula for tetraphosphorus heptasulfide.
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