Multiple Choice
A compound has an empirical formula of CH\(_2\) and a molar mass of 30.069 g/mol. What is its molecular formula?
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3. Chemical Reactions
Molecular Formula
Multiple Choice
Which of the following is the correct molecular formula for butane?
A
C3H8
B
C2H6
C
C4H10
D
C5H12
Verified step by step guidance1
Understand that the molecular formula represents the number of atoms of each element in a molecule. For hydrocarbons like alkanes, the general formula is \(C_nH_{2n+2}\).
Identify that butane is an alkane with 4 carbon atoms, so \(n = 4\) in the formula \(C_nH_{2n+2}\).
Substitute \(n = 4\) into the formula to find the number of hydrogen atoms: \(H = 2(4) + 2\).
Calculate the hydrogen count (without final numeric evaluation) to get the molecular formula as \(C_4H_{10}\).
Compare this formula to the options given and confirm that \(C_4H_{10}\) matches the correct molecular formula for butane.
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