The molar mass of hydrogen is 2.02 g/mol. a sample contains 4.00 mol of hydrogen. what is the mass, in grams, of this sample

In an exothermic reaction the bonding energy of the product is: less than the reactants same as the reactants greater than the reactants dependent upon the presence of a catalyst

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

Which element has the lowest electronegativity? calcium(ca) gallium(ga) selenium(se) bromine(br)