Mole ConceptHard
Question
Assume that the atomic mass of oxygen is 7. A sample of 11 g of an oxide of uranium contains 10 g of uranium. Which of the following formula for the oxide is compatible with the data?
Options
A.Uranium oxide is UO and the atomic mass of U is 70.
B.Uranium oxide is U3O8 and the atomic mass of U is 240.
C.Uranium oxide is UO2 and the atomic mass of U is 105.
D.Uranium oxide is U3O2 and the atomic mass of U is 105.
Solution
$(a)\frac{10}{70}:\frac{1}{7} = 1:1 \Rightarrow \text{ Formula = UO}$
$(b)\frac{10}{240}:\frac{1}{7} = 7:24 \Rightarrow \text{ Formula = }\text{U}_{7}O_{24} $$$(c),(d)\frac{10}{105}:\frac{1}{7} = 2:3 \Rightarrow \text{ Formula = }\text{U}_{2}O_{3}$$
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