1) Which of the following is(are) allotropes of oxygen?
(a) O-17
(b) ozone
(c) dioxygen (O2)
(d) water
(e) air
2) Chlorine has two naturally occurring isotopes, 35Cl and 37Cl, with masses of 34.9689 u and 36.9659 u, respectively. Calculate the abundances of these isotopes.
(a) 50.0%/50.0%
(b) 75.8%/24.2%
(c) 90.2%/9.8%
(d) 20.6%/79.4%
(e) 68.3%/31.7%
3) Which of the following is(are) allotrope of oxygen?
(a) graphite
(b) C-13
(c) carbon tetrachloride
(d) diamond
(e) buckminsterfullerene (bucky balls)
4) Bromine has two naturally occurring isotopes, 79Br and 81Br, with masses of 78.9183 u and 80.9163 u, respectively. Calculate the abundances of these isotopes.
(a) 32.6%/67.4%
(b) 74.5%/25.5%
(c) 29.3%/70.7%
(d) 50.7%/49.3%
(e) 38.2%/61.8%
5) Which of the following is(are) allotrope of phosphorus?
(a) P-31
(b) white phosphorus
(c) red phosphorus
(d) phosphorus pentachloride
(e) black phosphorus
6) Silver has two naturally occurring isotopes, 107Ag and 109Ag, with masses of 106.9051 u and 108.9048 u, respectively. Calculate the abundances of these two isotopes.
(a) 32.8%/67.2%
(b) 51.8%/48.2%
(c) 20.6%/79.4%
(d) 64.7%/35.3%
(e) 82.5%/17.5%
7) Which of the following is(are) allotrope of sulfur?
(a) sulfur dioxide
(b) yellow sulfur
(c) S-34
(d) sulfuric acid
(e) sulfur monoxide
8) Suppose you are trying to construct a periodic table in an parallel universe. You discover element "X", which has two isotopes. Isotope #1 has a mass of 39.96 u and an abundance of 74.2%. Isotope #2 has a mass of 40.96 u. What atomic mass would you put on the periodic table for element "X"?
(a) 40.22
(b) 40.46
(c) 39.96
(d) 40.96
(e) 70.61