Answer:
A. manganese change from +7 to +2
Explanation:
Reduction means a gain of electrons, which means the oxidation number will go down or the charge goes down basically or become more negative charge. On the left, Mn has +7 in MnO4-. On the right, it has 2+, so it has been reduced.
Explanation:
[H+]=10^-pH
[H+]=10^-9.2
[H+]=6.031x10^-10
[OH-]=1x10^-14÷[H+]
[OH-]=1x10^-14÷[6.031x10^-10]
[OH-]= 1.66x10^-5
im pretty sure this is right
1 mole --------- 22.4 L at ( STP )
? moles ------- 131.97 L
131.97 x 1 / 22.4 => 5.8915 moles
Therefore:
1 mole ------------- 6.02x10²³ atoms
5.8915 moles ----- ??
5.8915 x ( 6.02x10²³) / 1 =
= 3.5448x10²⁴ atoms
hope this helps!