Number 13 The oxidation number of Fe in K_3Fe(CN)_6 is A) -4. B)-3. C) +1. D) +3

Question

Number 13 The oxidation number of Fe in K_3Fe(CN)_6 is A) -4. B)-3. C) +1. D) +3. E) +2. What mass of C_6H_12U_6 (glucose) is needed to prepare 450. mL of a 0.650 M solution of glucose in water? A) 52.7 g B) 125 g C) 0.293 g D) 0.692 g E) 293 g A 20.00 ml sample of 0.1015 M nitric acid is introduced into a flask, and water is added until the volume of the solution reaches 250. mL. What is the concentration of nitric acid in the final solution? A) 8.12 times 10^-3 M B) 1.27 M C) 0.406 M D) 3.25 times 10^-2 M E) 5.08 times 10^-4 M A 3.682 g sample of KClO_3 is dissolved in enough water to give 375. mL of solution. What is the chlorate ion concentration in this solution? A) 8.01 times 10^-2 M B) 4.41 times 10^-2 M C) 3.00 times 10^-2 M D) 0.118 M E) 1.65 times 10^-2 M Calculate the density, in g/L, of N_2 gas at 35 degree C and 0.98 atm pressure. A) 0.34 g/L B) 0.039 g/L C) 9.6 g/L, D) 1.1 g/L E) 0.54 g/L Determine the molar mass of Freon-11 gas if a sample weighing 0 g occupies100 cm^3 at 95 degree C, and 1,000. mmHg. A) 0.19 g/mol B) 70.9 g/mol C) 35.3 g/mol D) 137 g/mol E) 384 g/mol

Explanation / Answer

Q13.

First, let us split the molecule:

K, Fe, CN

K = +1 always, since alkali metal

CN = -1 always

then

K3Fe(CN)6 = 0, since neutral compound

3*(+1) + Fe + 6(-1) = 0

solve for Fe

Fe = +6 - 3

Fe = +3

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