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3 years ago

PLEASE PLEASE PLEASE HELP ME CHEM! DUE IN 10 MINS!! 20 POINTS (SPAM COMMENTS WILL BE BLOCKED) GIVING OUT BRAINLIEST

Chemistry

1 answer:

geniusboy [140]3 years ago

8 0

Answer:

Natrium oxide

4 Na atoms

2 O atoms

Fluoride

6 F atoms

Lithium sulfate

8 Li atoms

16 SO atoms

Calcium

2 Ca atoms

Aluminum hydroxide

2 Al atoms

3 OH atoms

Manganese sulfate

2 Mn atoms

12 SO atoms

Cuprum chloride

1 Cu atom

2 CI atoms

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3 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

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

$0.042=\frac{molessolute}{27.78+molessolute}$

$1.167+0.042(molesolute)=molessolute$

$molessolute=1.218$

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

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3 years ago

When an apple or banana is cut, a chemical reaction with air causes the flesh to turn brown. Placing the fruit in a cold place,

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3 years ago