Final answer:
The molar mass of the element is d. 160g.
Step-by-step explanation:
The molar mass of an element refers to the mass of one mole of that element. In this question, we are given that 1.204 x 10²⁴ atoms of a certain element weigh 80g. To find the molar mass, we need to divide the given mass by the number of atoms in one mole of the element, which is represented by Avogadro's number (6.022 x 10²³). So, the molar mass of the element can be calculated as:
Molar mass = Mass / Number of atoms in 1 mole
Molar mass = 80g / (1.204 x 10²⁴ / 6.022 x 10²³) = d. 160g