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Vera_Pavlovna [14]
3 years ago
5

can someone please help me with these questions? predicting products and balancing the equations of single replacement​

Chemistry
1 answer:
FinnZ [79.3K]3 years ago
4 0
Put the metal with the non-metal and use the charges to figure it out
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2 years ago
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.
mrs_skeptik [129]

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}

Where

xB = mole fraction of solute=?

p^{0}=23.8torr

p = 22.8 torr

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

moles of solvent = mass / molar mass = 500 /18 = 27.78 moles

putting the values

molefraction=\frac{molessolute}{molesolute+molessolvent}

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mass of glucose = moles X molar mass = 1.218 X 180 = 219.24 grams



3 0
3 years ago
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