How many moles are there in 4 grams of oxygen?

What are the genotypic and phenotypic ratios

Consider the reaction: n2(g) + o2(g) ? 2no(g) kc = 0.10 at 2000oc starting with initial concentrations of 0.040 mol/l of n2 and 0.040 mol/l of o2, calculate the equilibrium concentration of no in mol/l how would this be done?

Joan writes four numbers on the board in standard form, and then she writes their scientific notation