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The Number Line
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Triadic Unit Mesh
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COHN - Natures Engineering Of The Human Body
The Human-Body Systems
Faith, Love, Charity
The standard for arsenic content in public water supplies is less than or equal to 10 parts per billion (ppb) arsenic. Assuming that this arsenic is present as arsenate ASO43-,
What mass of sodium arsenate would be present in a 1 L sample of drinking water that just meets the stadard?
S7P1A15 (containership - mass).
Pj Problem of Interest is of type containership (mass).
1 ppb = 1μg/L = (1 x 10-6) g /L
So, 10 ppb = 10 x 10-6 g/L
So, mass of arsenic in 1 L sample of drinking water = 10-5 g.
Molar mass of arsenic = 74.92 g
So mol of arsenic in 1 L = (1/74.92)(10-5) = 0.01335 x 10-5 mol
Na2AsO4 -------> 3Na+ + AsO43-
Mole ratio Na3AsO4:AsO43- = 1:1
So, mol of Na3AsO4 in 1 L sample of drinking water = 0.01335 x 10-5 mol.
Molar mass of Na3AsO4 =3x23 +74.92 + 4x16 = 69 + 74.92 + 64 = 207.92 g
So, mass of Na2AsO4 in 1 L sample of drinking water = 207.92(0.01335)(10-5) = 2.8 x 10-5 g of Na2AsO4.
The point . is a mathematical abstraction. It has negligible size and a great sense of position. Consequently, it is front and center in abstract existential reasoning.
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Ordinary Differential Equations (ODEs)
Separation Of Variables As Solution Method For Homogeneous Heat Flow Equation
Newton And Fourier Cooling Laws Applied To Heat Flow Boundary Conditions
Derivation Of Heat Equation For A One-Dimensional Heat Flow
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Composition And Structure Of Matter
How Matter Gets Composed
How Matter Gets Composed (2)
Molecular Structure Of Matter
Molecular Shapes: Bond Length, Bond Angle
Molecular Shapes: Valence Shell Electron Pair Repulsion
Molecular Shapes: Orbital Hybridization
Molecular Shapes: Sigma Bonds Pi Bonds
Molecular Shapes: Non ABn Molecules
Molecular Orbital Theory
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