Which is a characteristic of a solution1. its particles scatter light2. ita particles are evenly distributed 3. its particles se
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The number of atoms in 30.0 g of K would be 4.632 x atoms.
1 mole of a substance contains 6.022 x atoms.
Mole of 30.0 g of K potassium = 30/39
= 0.7692 moles
Hence, 0.7692 moles of K would contain
0.7692 x 6.022 x atoms.
= 4.632 x atoms.
More on Avogadro's number can be found here: brainly.com/question/1445383
Answer:
<em>8,459x10⁻³ M of Cr₂O₇²⁻</em>
Explanation:
The equation for the reaction of Fe²⁺ with Cr₂O₇²⁻ is:
Cr₂O₇²⁻(aq) + 6Fe²⁺(aq)+14H₃O⁺(aq) → 2Cr³⁺(aq) + 6Fe³⁺(aq)+21H₂O(l)
The moles of Fe²⁺ that you required for a complete reaction of Cr₂O₇²⁻ are:
0,01515 L × = 2,0301x10⁻³ moles of Fe²⁺
By the equation of the reaction, 1 mol of Cr₂O₇²⁻ reacts with 6 moles of Fe²⁺, thus, moles of Cr₂O₇²⁻ are:
2,0301x10⁻³ moles of Fe²⁺× = 3,3835x10⁻⁴ moles of Cr₂O₇²⁻
The molarity is:
= <em>8,459x10⁻³ M of </em>Cr₂O₇²⁻
I hope it helps!