On the periodic table, there are two numbers in the block for the element potassium, k: 19 and 39.09. what are the names of the numbers and what do they measure?

How many moles of al3+ ions are in 1.25 moles of al2o3

Consider the reaction of a(g) + b(g) + c(g) => d(g) for which the following data were obtained: experiment initial [a], mol/l initial [b], mol/l initial [c], mol/l initial rate, mol/l.s 1 0.0500 0.0500 0.0100 6.25 x 10^-3 2 0.100 0.0500 0.0100 2.50 x 10^-2 3 0.100 0.100 0.0100 1.00 x 10^-1 4 0.0500 0.0500 0.0200 6.25 x 10^-3 what is the rate law for the reaction?

What type of radiation is lead emitting in the following equation? alpha particles beta particles gamma rays