Chenchen wanted to identify whether the ethnic minority jewelry her mother brought back when she traveled to Yunnan was made of sterling silver.

(1) Density of the jewelry:

ρ=

m

V

=

90g

10cm3

=9g/cm3<10.5g/cm3,

So it is not made of pure silver;

(2) The mass of an equally large piece of jewelry made of sterling silver:

m=ρV=10.5g/cm3×10cm3=105g.

Answer: (1) The jewelry is not sterling silver;

(2) The mass of a similarly large piece of jewelry made of sterling silver is 105g.