Each of the following values was read on an instrument of measuring device. In each case the last digit was estimated. Tell what divisions would have been made on the scale or measuring device. example: 16.00 The scale read to tenths; hundredths were estimated

16 g

16.00 mL

160 cm

1600 g

160.0 g

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