Find the mass of 1.43 x 10^28 atoms of potassium

What does the mass of 0.7891 mol of ferric oxide (fe2o3)

There is one girl i like and i don't know how to tell her that, i have a feeling she knows but if she doesn't i don't want to make a fool out of myself how is one way to boost my confidence on asking her out

Areaction is first order with respect to reactant x and second order with respect to reactant y. which statement describes the rate law for this reaction?