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igor_vitrenko [27]
3 years ago
15

What is the number of valence electron of (Na). ?

Chemistry
1 answer:
sammy [17]3 years ago
3 0
There is 11 valence electrons in sodium (Na)
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The vapor pressure of water at 25.0°C is 23.8 torr. Determine the mass of glucose (molar mass = 180 g/mol) needed to add to 500.
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According to Raoult's law the relative lowering of vapour pressure of a solution made by dissolving non volatile solute is equal to the mole fraction of the non volatile solute dissolved.

the relative lowering of vapour pressure is the ratio of lowering of vapour pressure and vapour pressure of pure solvent

\frac{p^{0-}p}{p^{0}}=x_{B}

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x_{B}=\frac{23.8-22.8}{23.8}=0.042

mole fraction is ratio of moles of solute and total moles of solute and solvent

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3 years ago
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To calculate the atomic mass of the element, we take into consideration the masses of the individual sub atomic particles

Electrons have 0 atomic mass unit(their masses are negligible) we have no business here, Protons have a mass of

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The mass of 15 protons is thus 15 * 1.00727647 = 15.10914705 amu

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Adding this together, we have ; 11.0953194 + 15.10914705 = approximately 26.20 amu

6 0
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