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3 years ago

What number of moles of O2 will be produced by the decomposition of 4.4 moles of water?

Chemistry

1 answer:

adelina 88 [10]3 years ago

7 0

2.2 moles of O2 will be produced by the decomposition of 4.4 moles of water.

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If the molar absorptivity constant for the red dye solution is 5.56×104 M-1cm-1, calculate the molarity of the red dye solution

Shtirlitz [24]

Explanation:

a) Using Beer-Lambert's law :

Formula used :

$A=\epsilon \times c\times l$

where,

A = absorbance of solution = 0.945

c = concentration of solution = ?

l = length of the cell = 1.20 cm

$\epsilon$ = molar absorptivity of this solution = $5.56\times 10^4 M^{-1} cm^{-1}$

$0.945=5.56\times 10^4 M^{-1} cm^{-1}\times 1.20 \times c$

$c=1.4163\times 10^{-5} M=14.16 \mu M$

( $1\mu M=10^{-6} M$ )

14.16 μM is the molarity of the red dye solution at the optimal wavelength 519nm and absorbance value 0.945.

b) $c=1.4163\times 10^{-5} mol/L$

1 L of solution contains $1.4163\times 10^{-5}$ moles of red dye.

Mass of $1.4163\times 10^{-5}$ moles of red dye:

$1.4163\times 10^{-5}\times 879.86g/mol=0.01246 g$

$(w/v)\%=\frac{\text{Mass of solute (g)}}{\text{Volume of solvent (mL)}}\times 100$

$red(w/v)\%=\frac{0.01246 g}{1000 mL}\times 100=0.001246\%$

c) In order to dilute red dye solution by 5 times, we will need to add 1 L of water to solution of given concentration.

Concentration of red dye solution = $c=1.4163\times 10^{-5} M$

Concentration of red solution after dilution = c'

$c=c'\times 5$

$1.4163\times 10^{-5} M=c'\times 5$

$c'=2.83\times 10^{-6} M$

The final concentration of the diluted solution is $2.83\times 10^{-6} M$

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3 years ago

In a laboratory experiment,john uses a mesh to separate soil particles from water.what technique of separation is he using?

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John is using Filtration

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Explain how the relative atomic mass and the mass number of elements are different and hence why some elements have relative ato

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This is because the relative atomic mass is the sum of the no of protons and neutrons while the atomic no is of the former only. it is not a whole number it is th average weighted masses of the various isotopes of the element multiplied by their corresponding relative abundance. pls thank me and mark me briniest

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3 years ago

The principal that states that an object at rest will stay at rest and that an object in motion will stay in motion is the law o

Bogdan [553]

Answer: Newton's first law

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The element krypton (symbol: Kr) has several radioactive isotopes. Here

Dovator [93]

Answer:

Kr-81 is most stable because of its high half lige and kr-73 is the most radioactive because of its least half life

Explanation:

Stability is directly proportional to half life of a reaction

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