From the choices below, select the element that has 2 valence electrons, more than 30 neutrons but less than 70 neutrons. *
strontium (SI)
barium (Ba)
calcium (Ca)
rubidium (RD)

How to convert a density of 0.791g/cm3 to lb/ft3

How many grams of oxygen gas are contained in a 15 l sample at 1.02 atm and 28°c? show your work.

There are two steps in the usual industrial preparation of acrylic acid, the immediate precursor of several useful plastics. in the first step, calcium carbide and water react to form acetylene and calcium hydroxide: cac2 (s) + 2h2o (g) → c2h2 (g) + caoh2 (s) =δh−414.kj in the second step, acetylene, carbon dioxide and water react to form acrylic acid: 6c2h2 (g) + 3co2 (g) + 4h2o (g) → 5ch2chco2h (g) =δh132.kj calculate the net change in enthalpy for the formation of one mole of acrylic acid from calcium carbide, water and carbon dioxide from these reactions. round your answer to the nearest kj .