2 years ago

Find the mole fraction of Methanol CH3OH and water in a solution prepared by dissolving 4.5 g of alcohol in 40 g of H2O.

1 answer:

6 0

Calculations a technician performs for the CSP should be located on the O a) standard operating procedure (SOP). b) master formulation record (MFR). O) compounding record (CR). d) quality assurance

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how many lone pair electrons are on the central oxygen atom in the Lewis structure for dinitrogen pentoxide 9

iVinArrow [24]

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Dinitrogen pentaoxide is shown in the image attached. There are five oxygen atoms and two nitrogen atoms in the molecule. The molecule has a total of 40 valence electrons.

There are two electrons present on the central oxygen atom in the Lewis structure of dinitrogen pentaoxide as shown in the image attached.

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4 years ago

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The PH solution of NH3 of 0.950molar solution is 11.612. find the Kb

Vaselesa [24]

Answer:

1.8 x 10⁻⁵

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I 0.95 0 0

C -x +x +x

E 0.95-x x x

Kb= [NH₄⁺] [OH⁻] / ( NH₃) = x²/ (0.95-x )

P(OH) = 14-PH = 14-11.612 = 2.388

(OH)⁻¹ = 10⁻²°³⁸⁸ = 4.09 x 10⁻³ = x

Kb = (4.09 x 10⁻³)²/ (0.95-4.09 x 10⁻³)

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