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bekas [8.4K]
2 years ago
3

An iodine-clock kinetics experiment was performed by varying the composition of reactant solutions and measuring the resulting r

ates of reaction. 1st column: Reactant solution A; Reactant solution B; Time to complete reaction2nd column ‘Trial 1’: 10.0 mL I-(aq), 5.0 mL S2O2-3(aq); 10.0 mL I-(aq)5.0 mL S2O2-3(aq); 10 seconds3rd column ‘Trial 2’: 5.0 mL I-(aq)5.0 mL S2O2-3(aq); 10.0 mL S2O2-8(aq)1.0 mL starch(aq); 20 seconds4th column ‘Trial 3’: 5.0 mL S2O2-8(aq) 1.0 mL starch(aq); 10.0 mL S2O2-8(aq)1.0 mL starch(aq); 20 seconds How do Trials 2 and 3 in the above table differ? a. Trial 2 has half as much starch as Trial 3. b. Trial 2 has twice as much I- as Trial 3. c. Trial 3 has twice as much S2O2-8 as Trial 2. d. Trial 3 has half as much S2O2-3 as Trial 2. Four mechanisms have been proposed to explain the results in the table. Mechanism 1: I-(aq)+I-(aq)->I2-2(aq) (slow) I2-2(aq)+S2O2-8(aq)->I2(aq)+SO2-4(aq)(fast) Mechanism 2: I-(aq)+S2O2-8(aq)->[S2O8∙I]3-(aq) (slow) [S2O8∙I]3-(aq)+I-(aq)->I2(aq)+2SO2-4(aq) (fast) Mechanism 3: I-(aq)+S2O2-8(aq)<->[S2O8∙I]3-(aq) (fast) [S2O8∙I]3-(aq)+I-(aq)->I2(aq)+2SO2-4(aq) (slow) Mechanism 4: 2I-(aq)+S2O2-8(aq)->I2(aq)+2SO2-4(aq) Of the proposed mechanisms, which would be supported by the results in the table? Mechanism 1 Mechanism 2 Mechanism 3 Mechanism 4
Chemistry
1 answer:
nydimaria [60]2 years ago
6 0

it would be 826483916-873928+379 divided by 7253 which is 872538^19

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A 0.286-g sample of gas occupies 125 ml at 60. cm of hg and 25°
irga5000 [103]
Using the Equation: PV=nRT
Where P is the pressure 60 cmHg or 600 mmHg or 600/760= 0.789 atm
V is the volume 125 ml or 0.125 L, n is the number of moles, R is a constant 0.082057, and T is temperature 25 °C or 298 K; 
Therefore:
0.789 × 0.125 = n × 0.082057 × 298
 n = 0.0987/24.45 
    = 0.004036 mol
0.004036 mole has a mass of  0.286 g
Hence; 1 mole has a mass of 0.286/0.004036 
  = 70.8 g /mol
Therefore the molar mass of the gas is 71 g/mol (2 sfg)

     

4 0
2 years ago
En una determinación cuantitativa se utilizan 17.1 mL de Na2S2O3 0.1N para que reaccione todo el yodo que se encuentra en una mu
lozanna [386]

Answer:

La cantidad de yodo en la muestra es 0.217 g

Explanation:

Los parámetros dados son;

Normalidad de la solución de Na₂S₂O₃ = 0.1 N

Volumen de la solución de Na₂S₂O₃ = 17.1 mL

Masa de muestra = 0.376 g

La ecuación de reacción química se da de la siguiente manera;

I₂ + 2Na₂S₂O₃ → 2 · NaI + Na₂S₄O₆

Por lo tanto, el número de moles de sodio por 1 mol de Na₂S₂O₃ en la reacción = 1 mol

Por lo tanto, la normalidad por mol = 1 M × 1 átomo de Na = 1 N

Por lo tanto, 0.1 N = 0.1 M

El número de moles de Na₂S₂O₃ en 17,1 ml de solución 0,1 M de Na₂S₂O₃ se da de la siguiente manera;

Número de moles de Na₂S₂O₃ = 17.1 / 1000 × 0.1 = 0.00171 moles

Lo que da;

Un mol de yodo, I₂, reacciona con dos moles de Na₂S₂O₃

Por lo tanto;

0,000855 moles de yodo, I₂, reaccionan con 0,00171 moles de Na₂S₂O₃

La masa molar de yodo = 253.8089 g / mol

La masa de yodo en la muestra = 253.8089 × 0.000855 = 0.217 g.

5 0
2 years ago
Which air mass has formed immediately north of Antarctica in the image?
hammer [34]

Answer:

Maritime Polar

5 0
2 years ago
Read 2 more answers
PLZ HELP ASAP PLATO!!! BRAINLIEST TO WHOEVER ANSWERS CORRECTLY!!!
katen-ka-za [31]

Explanation:

a. 0.0093

Number of significant figures = 2

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b. 120.9

Number of significant figures = 4

All zero’s between integers are always significant.

c. 1,000

Number of significant figures = 1

All zeroes used solely for spacing the decimal point are not significant.

d. 1.008

Number of significant figures = 4

All zero’s between integers are always significant.

All zero’s after the decimal point are always significant.

e. 670

Number of significant figures = 2

All zeroes used solely for spacing the decimal point are not significant.

f. 0.184

Number of significant figures = 3

All zero’s after the decimal point are always significant.

g. 1.30

Number of significant figures = 3

All zero’s after the decimal point are always significant.

3 0
2 years ago
You heat 51 grams of magnesium over a Bunsen burner for several minutes until it reacts with oxygen in the air. Then you weigh t
garik1379 [7]

Answer:

    The mass was there all along, it was just in the air. The weight of the oxygen from the air is not weighed in the beginning, only at the end as part of the product, making it seem like there is a total mass change.

8 0
2 years ago
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