A certain semimetal M emits electrons only when struck by radiation with a minimum frequency
of 9.07 x 1014 s-1. On heating a 0.200 g sample of the semimetal in the air, the corresponding
oxide M2O3 was obtained. When the oxide was dissolved in aqueous acid, H3MO3 was formed.
When this was titrated with KMnO4, 6.67 mL of 0.100 M MnO4- was required to reach an
equivalence point. The unbalanced equation is
H3MO3(aq) + MnO4-(aq) → H3MO4(aq) + Mn2+(aq) (in acid)
a. Balance the equation.
b. How many moles of semimetal M were in the initial 0.200 g sample?
c. What is the identity of the semimetal M?
d. What is the minimum energy (in kJ/mol) required to cause the semimetal to emit
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