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4 years ago

Which element is reduced in the reaction below? fe2+ + h+ + cr2o72- → fe3+ + cr3+ + h2o?

1 answer:

7 0

Balance equation for given reaction is,

6 Fe²⁺ + Cr₂O₇²⁻ + 14 H⁺  → 6 Fe³⁺ + 2 Cr³⁺ + 7 H₂O

Oxidation Reaction:

  6 Fe²⁺ → 6 Fe³⁺ + 6 e⁻

Iron has lost 2 electron per mole and 6 electrons per 6 moles. As Fe oxidation state of Fe has changed from +2 to +3 so it has lost one electron and is oxidized.

Reduction Reaction:

Cr₂O₇²⁻ + 6 e⁻ →    2 Cr³⁺

Chromium has gained 3 electrons per mole and 6 electrons per 2 moles. As oxidation state of Cr has changed from +6 to +3 so it has gained 3 electrons and is reduced.

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If 5.12 liters of a 2.75 M phosphoric acid is neutralized by magnesium hydroxide solution of 4.00 M.

Tresset [83]

Answer:

5.28 L

Explanation:

Step 1:

Data obtained from the question.

Volume of acid (Va) = 5.12L

Molarity of acid (Ma) = 2.75M

Molarity of base (Mb) = 4M

Volume of base (Vb) =.?

Step 2:

The balanced equation for the reaction

2H3PO4 + 3Mg(OH)2 → Mg3(PO4)2 + 6H2O

From the balanced equation above,

Mole ratio of the acid (nA) = 2

Mole ratio of the base (nB) = 3

Step 3:

Determination of the volume of the base.

This is illustrated below:

MaVa/MbVb = nA/nB

2.75 x 5.12 / 4 x Vb = 2/3

Cross multiply

4 x 2 x Vb = 2.75 x 5.12 x 3

Divide both side by 4 x 2

Vb = (2.75 x 5.12 x 3)/(4 x 2)

Vb = 5.28 L

Therefore, the volume of the base is 5.28 L

8 0

4 years ago

Read 2 more answers

Plz help!!!!!!

Sever21 [200]

this shows that magnesium is higher in the reactivity series than lead.

I don't think there can be an ionic equation written because both components are in solid form and neither is in an aqeuos state.

5 0

4 years ago

Tuliskan persamaan tetapan kesetimbangan untuk reaksi-reaksi berikut a. Fe3+(aq) + SCN– (aq) ↔ FeSCN3+(aq) b. 3Fe(s) + 4H2O(g) ↔

nevsk [136]

Answer:

a. $K_c = \dfrac{[ FeSCN^{3+}_{(aq)}] }{[Fe^{3+}_{(aq)}] [SCN^-_{(aq)}]}$

b. $K_p = \dfrac{[H_2]^4}{[H_2O]^4}$

Explanation:

Untuk semua jenis reaksi umum:

$aA + bB\iff cC + dD$

Konstanta kesetimbangan $K_c = \dfrac{[C]^c [D]^d}{[A]^a[B]^b}$

Dari pertanyaan yang diberikan:

a. $Fe3^+_{(aq)} + SCN^-_{ (aq)} \iff FeSCN^{3+}_{(aq) }$

Konstanta kesetimbangan:

$K_c = \dfrac{[ FeSCN^{3+}_{(aq)}] }{[Fe^{3+}_{(aq)}] [SCN^-_{(aq)}]}$

b. $3Fe_{(s)} + 4H_2O_{(g)} \iff Fe_3O_4_{(s)} + 4H_{2(g)}$

Konstanta kesetimbangan untuk tekanan parsial $K_p$

$K_p = \dfrac{[H_2]^4}{[H_2O]^4}$

Karena Fe3O4 (s) hadir sebagai padatan.

8 0

3 years ago

BEANS so if you took you out of screw what would you put

Dennis_Churaev [7]

Explanation:

Toss drained/rinsed/dried beans with a bit of olive oil (or avocado oil) and your favorite seasonings. You can add crushed whole seeds (coriander, cumin, fennel, mustard, etc.), woodsy herbs (thyme, oregano, rosemary, sage), red pepper flakes, crushed garlic cloves, and of course salt and pepper. follow me

7 0

3 years ago

The volume of a unit cell of calcium is 0.1730 nm3nm3 and the density of calcium is 1.54 g/cm3g/cm3 .

Whitepunk [10]

The answer is 4.

Unit cell: The 3D arrangement of atoms, molecules, or ions in a crystal is called a crystal lattice. A unit cell is the smallest part of the crystal lattice that shows the three-dimensional pattern of the entire crystal.

How to find the number of atoms in a unit cell?