The density of copper is 8.95g/cm3 and the density of zinc is 7.14 g/cm3, a sample of a cu-zn is 80.5 percent cu and 19.5 percent zn what is the density of the alloy?

8.597 g/cm³.

Explanation:

Density of Cu = 8.95 g/cm³,

% of Cu = 80.5 %,

Density of Zn = 7.14 g/cm³,

% of Zn = 19.5 %.

∴ The density of the alloy = [(density of Cu) (Cu % / 100) + (density of Zn) (Zn % / 100)] = [( 8.95 g/cm³) (80.5 / 100) + (7.14 g/cm³) (19.5 / 100) = [7.205 g/cm³ + 1.39 g/cm³] = 8.597 g/cm³.

14 days is the half-life of phosphorus-32

the answer is option a.