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3 years ago

Air is made of seperate molecules of Oxygen, Nitrogen, and Carbon Dioxide. Is the air a pure substance or a mixture? Explain.

Chemistry

1 answer:

Ivan3 years ago

5 0

Air must be a mixture because it consists of at least three separate substances.

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When 231. mg of a certain molecular compound X are dissolved in 65. g of benzene (CH), the freezing point of the solution is mea

Elan Coil [88]

Answer:

Molar mass X = 18.2 g/mol

Explanation:

Step 1: Data given

Mass of compound X = 231 mg = 0.231 grams

Mass of benzene = 65.0 grams

The freezing point of the solution is measured to be 4.5 °C.

Freezing point of pure benzene = 5.5 °C

The freezing point constant for benzene is 5.12 °C/m

Step 2: Calculate molality

ΔT = i*Kf*m

⇒ΔT = the freezing point depression = 5.5 °C - 4.5 °C = 1.0 °C

⇒i = the Van't hoff factor = 1

⇒Kf = the freezing point depression constant for benzene = 5.12 °C/m

⇒m = the molality = moles X / mass benzene

m = 1.0 / 5.12 °C/m

m = 0.1953 molal

Step 3: Calculate moles X

Moles X = molality * mass benzene

Moles X = 0.1953 molal * 0.065 kg

Moles X = 0.0127 moles

Step 4: Calculate molar mass X

Molar mass X = mass / moles

Molar mass X = 0.231 grams / 0.0127 moles

Molar mass X = 18.2 g/mol

5 0

3 years ago

997.62 mol = 56.367 L =

Galina-37 [17]

14.626 Gallons because yeah dhhsjsjshshsh

4 0

3 years ago

Charlse Darwin introduced the theory of naturalselection as the mechanism for evolution true or false?

KonstantinChe [14]

True.
without natural selection darwin’s theory would not make sense :))

5 0

3 years ago

Which phrases accurately describe acids? Check all that apply.

weqwewe [10]

Answer: Option 1, 4 and 5 describe acids accurately.

Explanation:

Option 1: Acids have a sour taste because of the concentration of $H^+$ ion.

Option 2: They are corrosive in nature, that is they are not at all gentle with the skin and fabric as some acids intend to burn skin such as $H_2SO_4$ is a strong acid which can burn skin as well as fabric.

Option 3: Acids need electrons to release $H^+$ ions and non-metals do not donate electrons hence, there is no reaction between a non-metal and an acid.

Option 4: All acids do contain hydrogen. They dissociate in the presence of water to produce $H^+$ ions.

$HCl\overset{H_2O}{\rightarrow} H^++Cl^-$

Option 5: Acids do conduct electricity that is they carry electrical charges. This was explained by Arrhenius. He said that the acids dissociate into $H^+$ ions, when it is dissolved in water. These ions hence acts as charge carriers in water.

8 0

3 years ago

Read 2 more answers

A change in which property of light will have no effect on whether or not the photoelectric effect occurs

AURORKA [14]

The intensity of the light has no connection with the photoelectric effect.

That's what was so baffling about it before the particle nature of light 
was suspected ... a match with a blue flame might stimulate the 
photoelectric effect, but a high-power red searchlight couldn't do it.

3 0

3 years ago