Multiple Choice
How many atoms are present in a single molecule of Fe_2O_3?
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3. Chemical Reactions
Molecular Formula
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Given that the molar mass of coniine is 127.23 g/mol, which of the following is its correct molecular formula?
A
C8H15N
B
C6H13N
C
C7H15N
D
C8H17N
Verified step by step guidance1
Step 1: Understand that the molecular formula represents the actual number of atoms of each element in a molecule, and the molar mass is the sum of the atomic masses of all atoms in that formula.
Step 2: Calculate the molar mass of each given molecular formula option by multiplying the number of atoms of each element by their atomic masses (C = 12.01 g/mol, H = 1.008 g/mol, N = 14.01 g/mol) and summing them up.
Step 3: For example, for C8H15N, calculate the molar mass as: \$8 \times 12.01 + 15 \times 1.008 + 1 \times 14.01$ g/mol.
Step 4: Repeat the calculation for C6H13N and C7H15N using the same method.
Step 5: Compare the calculated molar masses with the given molar mass of coniine (127.23 g/mol) to determine which molecular formula matches best.
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