How many moles of O2- ions are there in 0.75 moles of aluminum oxide, Al2O3? What would be the mass in grams of these O2- ions?

What volume of a bicarbonate (HCO?3) solution with a concentration of 90 mg/L of alkalinity as CaCO3 would be needed to neutralize the sulfuric acid solution?

What will be the energy emitted when electrons of 1.0g atom of hydrogen transition giving the spectral line of lowest energy in the visible region of it's atomic spectrum?

Mole fraction of water vapour in the water saturated air is 0.02. If total pressure is 1.2 atm, what what would be the partial pressure of dry air?

Atomic mass of carbon is 12 u. One atom of magnesium is twice as heavy as one carbon atom. How should I calculate the atomic mass of magnesium?

The solubility of nitrogen gas in water at 25°C and a nitrogen pressure of 1.0 atm is 6.9 x 10-4 M. What would be the solubility of nitrogen in water at a nitrogen pressure of 1.5 atm?

Write an acceptable IUPAC name for the compound below. Include 'cis' and trans' as part of the name when stereochemistry is illustrated?

The reaction for dissolving gaseous HCl in water is HCl (g) --> H+ (aq) + Cl- (aq). How many bonds are broken per HCl formula unit when a sample of gaseous HCl dissolves?

If the angle if incidence of light on a diffraction grating is 0.0 degrees what is the wavelength of light in (nm) which will be reflected by 12.8 degrees in first order if the grating has 1350 groves per millimeter?

By what factor does the fraction of collisions with energy equal to or greater than activation energy at 100 kJ/mol. change if the temperature increases from 32 degrees celsius to 63 degrees celsius. What would be the answer in SCIENTIFIC NOTATION?

A compound is 54.53% C, 9.15% H, and 36.32% O by mass. What would be it's empirical formula?