How are scents or fragrances used in cosmetology? why would a cosmetologist need to be aware of scents and fragrances?

Calculate the h3o+ concentration in a solution of acetic acid if the concentration of molecular acetic acid present at equilibrium is 9.97x10^-3 m and k for the dissociation is 1.86x10^-5. ch3cooh(aq)+h2o(> h3o^+(aq)+ch3coo^-(aq)

How many grams of co(g) are there in 74.5 ml of the gas at 0.933 atm and 30o c?

Find the number of grams of hcl needed to react completely with .50 moles of magnesium.