What is the total mass of Kr-42 remaining in a 20-mg sample after 48.8 hours? (1) 2.5 mg
(2) 5.0 mg
(3) 10 mg
4) 20 mg

Which of the following elements would you expect to have the lowest ionization energy value? fluorine, lithium, neon, nitrogen

Asample of ammonia reacts with oxygen as shown. 4nh3(g) + 5o2(g) 4no(g) + 6h2o(g) what is the limiting reactant if 4.0 g of nh3 react with 8.0 g of oxygen? o2 because it produces only 0.20 mol of no. nh3 because it produces only 0.20 mol of no. o2 because it produces two times less no than nh3. nh3 because it produces three times more no than o2.

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