Mathematics : asked on ericuh
 03.12.2021

What is the value of h if 4h+5=106

. 8

Faq

Chemistry
Step-by-step answer
P Answered by Master

The correct option is:  1.5 × 10⁻⁴¹

Explanation:

Given half reactions:

MnO₄⁻ + 8H⁺ + 5e⁻ → Mn²⁺ + 4H₂O,              E° = 1.51 V

Cr₂O₇²⁻ + 14H⁺ + 6e⁻ → 2Cr³⁺ + 7H₂O,           E° = 1.33 V

For a Galvanic cell, the standard cell potential: E°cell > 0

E°cell = E°cathode - E°anode = + 1.51 V - 1.33 V = + 0.18 V

∴ CATHODE: MnO₄⁻ + 8H⁺ + 5e⁻ → Mn²⁺ + 4H₂O

ANODE: 2Cr³⁺ + 7H₂O → Cr₂O₇²⁻ + 14H⁺ + 6e⁻

Now, multiply cathode reaction with 6 and multiply anode reaction with 5.

CATHODE: MnO₄⁻ + 8H⁺ + 5e⁻ → Mn²⁺ + 4H₂O] × 6

ANODE:      2Cr³⁺ + 7H₂O → Cr₂O₇²⁻ + 14H⁺ + 6e⁻] × 5

Now adding the two equations, to obtain the overall reaction:

6 MnO₄⁻ +  10Cr³⁺ + 11 H₂O → 6Mn²⁺ + 5Cr₂O₇²⁻ + 22 H⁺

Therefore, the reaction quotient is:

Q = \frac{[Mn^{2+}]^{6}[Cr_{2}O_{7}^{2-}]^{5}[H^{+}]^{22}}{[Cr^{3+}]^{10}[MnO_{4}^{-}]^{6}}\\

Given: [MnO₄⁻] = 0.10 M, [Cr³⁺] = 0.40 M, [Mn²⁺] = 0.20 M, [Cr₂O₇²⁻] = 0.30 M, [H⁺] = 0.010 M

Now putting these given values of concentration of species in the above equation, we get;

Q = \frac{[0.20 M]^{6}[0.30 M]^{5}[0.010 M]^{22}}{[0.40 M]^{10}[0.10 M]^{6}} = 1.48 \times 10^{-41} \approx 1.5 \times 10^{-41}

Therefore, the Reaction quotient Q for the given cell reaction = 1.5 × 10⁻⁴¹

Chemistry
Step-by-step answer
P Answered by Master

The correct option is:  1.5 × 10⁻⁴¹

Explanation:

Given half reactions:

MnO₄⁻ + 8H⁺ + 5e⁻ → Mn²⁺ + 4H₂O,              E° = 1.51 V

Cr₂O₇²⁻ + 14H⁺ + 6e⁻ → 2Cr³⁺ + 7H₂O,           E° = 1.33 V

For a Galvanic cell, the standard cell potential: E°cell > 0

E°cell = E°cathode - E°anode = + 1.51 V - 1.33 V = + 0.18 V

∴ CATHODE: MnO₄⁻ + 8H⁺ + 5e⁻ → Mn²⁺ + 4H₂O

ANODE: 2Cr³⁺ + 7H₂O → Cr₂O₇²⁻ + 14H⁺ + 6e⁻

Now, multiply cathode reaction with 6 and multiply anode reaction with 5.

CATHODE: MnO₄⁻ + 8H⁺ + 5e⁻ → Mn²⁺ + 4H₂O] × 6

ANODE:      2Cr³⁺ + 7H₂O → Cr₂O₇²⁻ + 14H⁺ + 6e⁻] × 5

Now adding the two equations, to obtain the overall reaction:

6 MnO₄⁻ +  10Cr³⁺ + 11 H₂O → 6Mn²⁺ + 5Cr₂O₇²⁻ + 22 H⁺

Therefore, the reaction quotient is:

Q = \frac{[Mn^{2+}]^{6}[Cr_{2}O_{7}^{2-}]^{5}[H^{+}]^{22}}{[Cr^{3+}]^{10}[MnO_{4}^{-}]^{6}}\\

Given: [MnO₄⁻] = 0.10 M, [Cr³⁺] = 0.40 M, [Mn²⁺] = 0.20 M, [Cr₂O₇²⁻] = 0.30 M, [H⁺] = 0.010 M

Now putting these given values of concentration of species in the above equation, we get;

Q = \frac{[0.20 M]^{6}[0.30 M]^{5}[0.010 M]^{22}}{[0.40 M]^{10}[0.10 M]^{6}} = 1.48 \times 10^{-41} \approx 1.5 \times 10^{-41}

Therefore, the Reaction quotient Q for the given cell reaction = 1.5 × 10⁻⁴¹

Mathematics
Step-by-step answer
P Answered by PhD
Answer: 440 grams for 1.54 is the better value
Explanation:
Take the price and divide by the number of grams
1.54 / 440 =0.0035 per gram
1.26 / 340 =0.003705882 per gram
0.0035 per gram < 0.003705882 per gram
Mathematics
Step-by-step answer
P Answered by PhD

For every 8 cars there are 7 trucks

Therefore,

Cars:Truck=8:7

Answer is B)8:7

Mathematics
Step-by-step answer
P Answered by PhD

The solution is in the following image

The solution is in the following image
Mathematics
Step-by-step answer
P Answered by PhD

F=ma

where F=force

m=mass

a=acceleration

Here,

F=4300

a=3.3m/s2

m=F/a

    =4300/3.3

    =1303.03kg

Approximately it is aqual to 1300kg

Mathematics
Step-by-step answer
P Answered by PhD

The wood before starting =12 feet

Left wood=6 feet

Wood used till now=12-6=6 feet

Picture frame built till now= 6/(3/4)

=8 pieces

Therefore, till now 8 pieces have been made.

Mathematics
Step-by-step answer
P Answered by PhD

Salesperson will make 6% of 1800

=(6/100)*1800

=108

Salesperson will make $108 in $1800 sales

Mathematics
Step-by-step answer
P Answered by PhD

The solution is given below

The solution is given below

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