A sample of zinc has the following composition:What is the relative atomic mass of the zinc in this sample?A. 64.5B. 65.0C. 65.9D. 66.4

A certain sample of element Z contains 60% of 69Z and 40% of 71Z. What is the relative atomic mass ofelement Z in this sample?A. 69.2B. 69.8C. 70.0D. 70.2

A sample of element X contains 69 % of 63X and 31 % of 65X.What is the relative atomic mass of X in this sample?A. 63.0B. 63.6C. 65.0D. 69.0

An unknown element, Z, has 3 isotopes: Z5, Z6 and Z8. Given that the atomic mass of Z is 7, and the relative abundance of Z5 is 20%, which of the following statements are correct? 1. Z5 and Z6 are present in the same abundance. 2. Z8 is the most abundant of the isotopes. 3. Z8 is more abundant than Z5 and Z6combined. A. 1 only B. 2 only C. 3 only D. 1 and 3 E. 1, 2 and 3

39 A sample of sulfur consists mostly of 32S. It also contains 4.2% 34S and 2.8% 36S. No otherisotopes of sulfur are present.What is the relative atomic mass, Ar , of this sample of sulfur?A 32.1 B 32.2 C 34.0 D 34.3

Copper consists of the isotopes 63Cu and 65Cu has a relative atomic mass of 63.55. What is the most likelycomposition?63Cu 65CuA. 30 % 70 %B. 50 % 50 %C. 55 % 45 %D. 70 % 30 %