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4 years ago

11

Jamal wants to make a model of a hill near his house to test the way the slope affects how rain runs down the hill. Which type o

f model would be best for what he needs?

2 answers:

Scrat [10]4 years ago

8 0

a scale-model mound made of the same materials that make the real hill

Nikitich [7]4 years ago

4 0

a scale-model mound made of the same materials that make the real hill

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What mass of solid that has a molar mass of 46.0 g/mol should be added to 150.0 g of benzene to raise the boiling point of benze

enyata [817]

Answer : 17.12 g

Explanation: $\Delta T =k_b\times m$

$\Delta T$ = elevation in boiling point

$k_b$ = boiling point elevation constant

m= molality

$molality=\frac{mass of solute}{molecular mass of solute\times weight of the solvent in kg}$

given $\Delta T=6.28^{\circ}C$

Molar mass of solute = 46.0 $gmol^{-1}$

Weight of the solvent = 150.0 g = 0.15 kg

Putting in the values

$molality=\frac{x}{46gmol^{-1}\times0.15kg}$

$6.28 =2.53^{\circ}Ckgmol^{-1}\frac{x}{46gmol^{-1}\times 0.15kg}$

x = 17.12 g

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Answer:

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