Final answer:
The molar mass of each compound is found by summing the atomic masses of all atoms in the molecular formula of the compound. For example, CH₃OH has a molar mass of 32.05 g/mol, O₂ is 32.00 g/mol, C₆H₁₂O₆ is 180.16 g/mol, and Ca(NO₃)₂ is 164.10 g/mol.
Step-by-step explanation:
The molar mass of a compound is the sum of the atomic masses of all the atoms in its molecular formula. The molar mass is expressed in units of grams per mole (g/mol). Here's how to calculate the molar mass for each compound:
- CH₃OH: The molar mass of methanol (CH₃OH) is the sum of the atomic masses of one carbon (C, approximately 12.01 g/mol), four hydrogens (H, approximately 1.01 g/mol each), and one oxygen (O, approximately 16.00 g/mol). So, the total molar mass = 12.01 + (4 × 1.01) + 16.00 = 32.05 g/mol.
- O₂: The molar mass of oxygen gas (O₂) is the sum of the atomic masses of two oxygen atoms, which is 2 × 16.00 g/mol = 32.00 g/mol.
- C₆H₁₂O₆: The molar mass of glucose (C₆H₁₂O₆) is the sum of the atomic masses of six carbons, twelve hydrogens, and six oxygens. The total molar mass = (6 × 12.01) + (12 × 1.01) + (6 × 16.00) = 180.16 g/mol.
- Ca(NO₃)₂: The molar mass of calcium nitrate (Ca(NO₃)₂) is the sum of the atomic masses of one calcium (Ca, approximately 40.08 g/mol), two nitrogens (N, approximately 14.01 g/mol each), and six oxygens. The total molar mass = 40.08 + (2 × 14.01) + (6 × 16.00) = 164.10 g/mol.
Note: The number of moles provided in the question doesn't affect the molar mass calculation, as molar mass is an intrinsic property of the substance.