What is the mass of c3h8?

The mass of C3H8 (propane) refers to its molar mass. To calculate this, sum the atomic masses of its constituent atoms. Carbon has an atomic mass of approximately 12.1 g/mol, and hydrogen is about 1.8 g/mol. Therefore, the molar mass of C3H8 is (3 * 12.1) + (8 * 1.8) = 44.10 g/mol.