(UFPE) O cobre consiste em dois isótopos com massa 62,96u e 64,96u e abundância isotópica de 70,5% e 29,5%, respectivamente. A massa atômica do cobre
é:
(a) 63,96u
(b) 63,00u
(c) 63,80u
(d) 62,55u
(e) 63,55u

Grata por qm puder me ajudar!

100 grams of molten lead (600°c) is used to make musket balls. if the lead shot is allowed to cool to room temperature (21°c), what is the change in entropy (in j/k) of the lead? (for the specific heat of molten and solid lead use 1.29 j/g⋅°c; the latent heat of fusion and the melting point of lead are 2.45 × 104 j/kg and 327°c, respectively.)

Why does a plastic bottle that is sealed at a high altitude change it’s shape when taken to lower altitude

Using the first volume and temperature reading on the table as v1 and t1, solve for the unknown values in the table below. remember to use the rules of significant figures when entering your numeric response.