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kiruha [24]
2 years ago
12

Please help i'm not good at this 3, (i'll give brainliest to the most helpful answer)

Chemistry
1 answer:
stira [4]2 years ago
7 0

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Four liquids are described in the table below. Use the second column of the table to explain the order of their freezing points,
KIM [24]
Transcribed image text: Four liquids are described in the table below. Use the second column of the table to explain the order of their freezing points, and the third column to explain the order of their boiling points. For example, select '1' in the second column next to the liquid with the lowest freezing point. Select '2' in the second column next to the liquid with the next higher freezing point, and so on. In the third column, select '1' next to the liquid with the lowest boiling point, '2' next to the liquid with the next higher boiling point, and so on. Note: the density of water is 1.00g/mL .
7 0
2 years ago
What is the mass of 8.90 moles of magnesium chloride, MgCl2?
Korolek [52]
No of moles of MgCl2 = weight of MgCl2 / Molecular weight of MgCl2 Weight of MgCl2 =moles of MgCl2 x molecular mass of MgCl2 = 8.90 x 95=845.5 gm
6 0
3 years ago
Astronauts on the Moon can jump higher than if they were on Earth. This is because...
Mekhanik [1.2K]
This is because of Gravity. Your muscles or your entire body is at ease or whatever because the moon has more mass than earth. 
4 0
2 years ago
Read 2 more answers
Hydrazine (N2H4) is a fuel used by some spacecraft. It is normally oxidized by N2O4 according to the following equation:
Serggg [28]

Answer:

-476.95 Kj

Explanation:

N2H4(l) + N2O4(g) = 2N2O(g) + 2H20(g)

∆Hrxn = n∆Hf(products) - m∆Hf(reactants)

Where n and m = stoichiometric coefficients of the products and reactants respectively from the balanced chemical equation, ∆Hf = standard enthalpy of formation, ∆Hrxn= standard enthalpy of reaction.

Using the following standard enthalpies of formation ( you did not provide any ):

N2H4(l) = +50.63Kj/mol; N2O4(g) = +9.08Kj/mol; N2O(g) =+33.18Kj/mol; H2O(g) = -241.8Kj/mol

∆Hrxn = [ (2(∆Hf(N2O)) + (2(∆Hf(H2O))] – [(1(∆Hf(N2H4)) + (1(∆Hf(N2O4))]

∆Hrxn = [ 2(+33.18) + 2(-241.8)] – [ (+50.63) + (+9.08)]

∆Hrxn = [ (+66.36)+(-483.6)] – [ +50.63+9.08]

∆Hrxn = [ +66.36-483.6] – [+59.71]

∆Hrxn = -417.24-59.71

∆Hrxn = -476.95 Kj

NOTE: Remember to use the standard enthalpies of formation given to you by your instructor if they differ from the values used herein, and follow the same procedure.

6 0
3 years ago
In a mixture of volatile substances, the vapor pressure of the solution depends on the vapor pressure of both substances (solute
Alborosie

Answer:

30.4 torr

Explanation:

We have all the information which is required to solve this question ( more than we even need as the molecular weight)

Ptotal = Ptoluene + Pbenzene

Ptotal = Xtoluene Pºtoluene + XbenzenePºbenzene

The mole fraction is given by the formula:

X =number of moles / total number of moles

Xtoluene = 8.53 / (2.15+8.53) = 0.80

Xbenzene = 2.15 / 10.68 = 0.20

⇒Ptotal = 0.80 x 14torr + 0.20 x 96 torr = 30.4 torr

5 0
3 years ago
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