A student is trying to identify the composition of a pure metal block by determining its density. The student records the mass of the sample to be 25.0 g. The rectangular block is 3.00 cm × 3.00 cm × 1.40 cm. Calculate the density (in g/cm3). Express your answer to the correct number of significant figures.

he would use the colour black

percent abundance for cu-63 can be shown as:

63 x + 65 (1-x) = 62.9296

65 - 62.9296 = 2 x

x = 1.035

thus, percent abundance for cu-63 is 1.035

percent abundance for cu-65 can be shown as:

63 x + 65 (1-x) = 64.9278

65 - 64.9278 = 2 x

x = 0.0361

thus, percent abundance for cu-63 is 0.0361

the mass spectrum of cu-63 showing the intense peak as, this isotope is found in nature more abundantly around 92.38 % in comparison to cu-65 which is found 62.58 % naturally