Which of these best describes the scientific process

Infants born with severe respiratory problems are sometimes given liquid ventilation: they breathe a liquid that can dissolve more oxygen than air can hold. one of these liquids is a fluorinated compound, cf3(cf2)7br. the solubility of oxygen in this liquid is 66 mlo2 per 100 ml liquid. in contrast, air is 21 % oxygen by volume. calculate the moles of o2 present in an infant's lungs (volume: 12 ml ) if the infant takes a full breath of air. assume a pressure of 1 atm in the lungs.

Determine the number o moles of ions/atoms/particle in the following: 2.50 miles of k2s (let me know how to do)

Which of these properties, used alone, would be least useful in identifying most minerals? a. color b. luster c. streak d. density