How many grams of copper, cu are there in 2.55mol of cu?

Can someone me with questions 15 to 17 plz.

Consider the story you just read. all but one of the choices below indicate that something is living.

Aroller coaster is traveling at 13 mi./s when you purchase a hill that is 400 m long and down the hill exonerate at 4.0 m/s squared what is the final velocity of the posterior found your answer to the nearest number