Which is the formula mass of Na₂SO₄? 119.06 amu, 125.98 amu, 142.05 amu, or 174.12 amu?

Which is the molar mass of H2O? 10.02 g/mol 16.00 g/mol 17.01 g/mol 18.02 g/mol

Here is the query: What is the molar mass of fluorine, F₂? Is it 9.00 g/mol, 18.00 g/mol, 19.00 g/mol, or 38.00 g/mol?

Which is the molar mass of BF₃? 10.81 g/mol 29.81 g/mol 48.81 g/mol 67.81 g/mol

What is the molar mass of 1-butene if 5.38 × 10¹⁶ molecules of 1-butene weigh 5.00 μg?