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2 years ago

SOME HELP WOULD BE NICE!!! PLEASEEE

Chemistry

1 answer:

Snowcat [4.5K]2 years ago

4 0

Answer:

Iron

Explanation:

The continental crust is less dense than oceanic crust because it contains less amount of iron.

The continental crust is predominantly rich in alumino-silicates.

Although compared to oceanic crust, the continental crust is thicker.
The oceanic crust is made up of iron and magnesium rich minerals.
They are called mafic minerals.
These minerals are much denser than the alumino-silicates.

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nataly862011 [7]

Answer: C) 0.020 m

Explanation:

Molality of a solution is defined as the number of moles of solute dissolved per kg of the solvent.

$Molality=\frac{n\times 1000}{W_s}$

where,

n = moles of solute

$W_s$ = weight of solvent in g

Mole fraction of $CO_2$ is = $3.6\times 10^{-4}$ i.e. $3.6\times 10^{-4}$ moles of $CO_2$ is present in 1 mole of solution.

Moles of solute $(CO_2)$ = $3.6\times 10^{-4}$

moles of solvent (water) = 1 - $3.6\times 10^{-4}$ = 0.99

weight of solvent = $moles\times {\text {Molar mass}}=0.99\times 18=17.82g$

Molality = $\frac{3.6\times 10^{-4}\times 1000}{17.82g}=0.020$

Thus approximate molality of $CO_2$ in this solution is 0.020 m

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3 years ago

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Rudiy27

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