Answer: If a mineral contains only atoms of oxygen and metal, it is most likely an oxide mineral.
Explanation:
To calculate the atomic mass of a single atom of an element, add up the mass of protons and neutrons.
The mole fraction of a gaseous compound is equal to the ratio of the vapor pressure of the compound to the total pressure of the vessel. In this case, teh vapor pressure of tehe non-electrolyte is 760 - 745 = 15 mmHg. hence the mole fraction is 15 mm Hg / 760 mmHg equal to 0.0197
