Which of the following alkanes has the lowest molecular weight?

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Question: Which of the following alkanes has the lowest molecular weight?

Options:

Correct Answer: Methane

Solution:

Methane (CH4) has the lowest molecular weight among the given alkanes.

Which of the following alkanes has the lowest molecular weight?

Which of the following alkanes has the lowest molecular weight?

Step 1: Understand what alkanes are. Alkanes are hydrocarbons with the general formula CnH2n+2.
Step 2: Identify the alkanes you are comparing. Common alkanes include methane (CH4), ethane (C2H6), propane (C3H8), and butane (C4H10).
Step 3: Calculate the molecular weight of each alkane. The molecular weight is the sum of the weights of all the atoms in the molecule.
Step 4: For methane (CH4), the molecular weight is 12 (for C) + 4 (for H) = 16 g/mol.
Step 5: For ethane (C2H6), the molecular weight is 24 (for C) + 6 (for H) = 30 g/mol.
Step 6: For propane (C3H8), the molecular weight is 36 (for C) + 8 (for H) = 44 g/mol.
Step 7: For butane (C4H10), the molecular weight is 48 (for C) + 10 (for H) = 58 g/mol.
Step 8: Compare the molecular weights calculated: Methane (16 g/mol), Ethane (30 g/mol), Propane (44 g/mol), Butane (58 g/mol).
Step 9: Determine which alkane has the lowest molecular weight. Methane has the lowest at 16 g/mol.

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