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KonstantinChe [14]
3 years ago
8

There are approximately 15 milliliters (mL) in 1 tablespoon (tbsp). Which expression can be used to find the approximate number

of milliliters in 3 tbsp?
Chemistry
2 answers:
Helga [31]3 years ago
8 0
You know 1 tbsp is 15 milliliters so you would multiply 15 and 3 together. 15 x 3 =45
So there are 45 milliliters in 3 tbsp.
yuradex [85]3 years ago
4 0

Answer : The approximate number of milliliters in 3 tbsp will be, 45 milliliters

Explanation :

Using the unitary method :

According to the question,

As, 1 tablespoon is present in 15 milliliters

So, 3 tablespoon is present in \frac{3\text{ tablespoon}}{1\text{ tablespoon}}\times 15\text{ milliliters}=45\text{ milliliters}

Therefore, the approximate number of milliliters in 3 tbsp will be, 45 milliliters

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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}

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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