An analytical chemist determines that an estuarine water sample contains 1.5 g/L of sulfate (S042-). What is the concentration in terms of (i) grams per liter sulfur, (ii) molar concentrations of sulfate, (iii) normality, and (iv) parts per million sulfate

Both 1,2−dihydronaphthalene and 1,4−dihydronaphthalene may be selectively hydrogenated to 1,2,3,4−tetrahydronaphthalene. one of these isomers has a heat of hydrogenation of 101 kj/mol (24.1 kcal/mol), and the heat of hydrogenation of the other is 113 kj/mol (27.1 kcal/mol). match the heat of hydrogenation with the appropriate dihydronaphthalene.

Smog is the term used to describe the combination of fog and smoke

What is the empirical formula of a compound that is 50.7% antimony and 49.3% selenium ?