To an aqueous potassium permanganate solution, KMnO4 (aq) is added, dropwise, a solution of the slightly acidic aqueous solution of sodium bisulfite, NaHSO3 (aq), to form a brown precipitate, MnO2 (s). Using a balanced half-reaction, determine if (MnO4)^1-(aq) -> MnO2 (s) is a reduction or an oxidation. (10 points)

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mass = 6.75 g

volume =   9 cm³

therefore:

d = mass / volume

d   = 6.75 / 9

d = 0.7 g/cm³

answer b

level 4 to level 2 : ))

percent abundance for cu-63 can be shown as:

63 x + 65 (1-x) = 62.9296

65 - 62.9296 = 2 x

x = 1.035

thus, percent abundance for cu-63 is 1.035

percent abundance for cu-65 can be shown as:

63 x + 65 (1-x) = 64.9278

65 - 64.9278 = 2 x

x = 0.0361

thus, percent abundance for cu-63 is 0.0361

the mass spectrum of cu-63 showing the intense peak as, this isotope is found in nature more abundantly around 92.38 % in comparison to cu-65 which is found 62.58 % naturally