1. how many moles are 1.20x10^25 atoms of phosphorous? 2. how many atoms are in 0.750 moles of zinc? 3. how many molecules are in 0.400 moles of n2o5? 4. find the number of moles of argon in 452 g of argon. 5. find the grams in 1.26 x 10-4 mol of hc2h3o2. show work on all

What is the value of keq for the reaction expressed in scientific notation?

What substance has a mass of 9.5g and volume of 2.1cm^3

Consider hydrogen in an excited state n = 5n=5 that emits photons to reach the ground state. there are various possible transitions other than straight to the ground state that can occur; for example, it can drop to the n = 3n=3 state followed by the n = 3n=3 to the ground state transition. which of the possible transitions will result in the emission of a photon in the visible region?