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3 years ago

¿cual es la expresion matematica para dos magnitudes que se relacionan de una forma directamente proporcional?

Chemistry

1 answer:

DENIUS [597]3 years ago

3 0

Answer:

Explanation:

I guess it says more about the problem

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An unknown sample weighing 0.3512g was added to 20.0 mL of cyclohexane. The density of cyclohexane is 0.779g/mL, and the freezin

rjkz [21]

Explanation:

It is known that density is mass of a substance divided by its volume.

Mathematically, Density = $\frac{mass}{volume}$

Therefore, calculate the mass of cyclohexane as follows.

mass of cyclohexane = Density × volume

= $0.779 g/mL \times 20 mL$

= 15.58 g

or, = 0.01558 kg (as 1 kg = 1000 g)

As, K_{f} of cyclohexane = $20^{o}C/m$

$\Delta T_{f} = K_{f} \times molality$

$5.2 = 20 \times molality$

molality = $\frac{5.2}{20}$

= 0.26 m

Also, molality is the number of moles of solute present in kg of solvent.

Mathematically, molality = $\frac{\text{no. of moles}}{\text{mass of solvent}}$

0.26 = $\frac{\text{no. of moles}}{0.01558}$

No. of moles = $4.05 \times 10^{-3}$

As, No. of moles = $\frac{mass}{\frac{molar mass}}$

$4.05 \times 10^{-3} = \frac{0.3512}{\text{molar mass}}$

molar mass = 87.0 g/mol

Thus, we can conclude that molar mass of unknown substance is 87.0 g/mole.

4 0

3 years ago

A mixture of nitrogen and xenon gases contains nitrogen at a partial pressure of 251 mm Hg and xenon at a partial pressure of 47

klio [65]

I uploaded the answer to a file hosting. Here's link:

tinyurl.com/wpazsebu

3 0

3 years ago

Entropy measures _____. 1 point A. Energy B. Heat Transferred C. Disorder D. Force

dlinn [17]

Answer: Option (C) is the correct answer.

Explanation:

The degree of randomness or disorder is known as entropy. This means that more randomly or rapidly the molecules of a substance are moving in a container or in the Universe more will be its entropy.

For example, gases move more rapidly that solids or liquids and hence gases have high entropy.

Therefore, we can conclude that entropy measures disorder.

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3 years ago

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Pick the TWO conversions which are exact. 1 yd = 36 in 454 g = 1 lb 1 kg = 1000 g 1 kg = 2.204 lb

Alexeev081 [22]

1 yd = 36 in and 1 kg = 1000 g

Hope this helps!

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3 years ago

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Identify the branch of chemistry. percentage purity of glucose.

inna [77]

Analytic chemistry

I think

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4 years ago