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deaishaajennings123
06.05.2021 •
Chemistry
57
Which arrangment best represents the decreasing order of atomic radius for the following elements?
N, S, As, Se, Po
ut of 1
Select one:
uestion
O a. O
O b. As < Se
Oc. O >N>S>P> Se > As
O d. As > Se > P>S>N>O
O e. none of the above
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Ответ:
C. 4x10⁻⁴ mol / (Ls)
Explanation:
Based in the reaction:
5 H₂O₂(aq) + 2 MnO₄⁻(aq) + 6 H⁺(aq) → 2 Mn²⁺(aq) + 8 H₂O(l) + 5 O₂(g)
2 moles of MnO₄⁻ disappears while 5 moles of O₂ appears.
If 5 moles appears in a rate of 1.0x10⁻³mol /(Ls), 2 moles will disappear:
2 moles ₓ (1.0x10⁻³mol /(Ls) / 5 moles) = 4x10⁻⁴ mol / (Ls)
Right answer is:
C. 4x10⁻⁴ mol / (Ls)