A 1500 L weather balloon is at 'a temperature of 290 K on the ground. As it rises the
temperature drops. At 15,000 ft, the temperature is down to 210 K. What is the
volume at this elevation?

Answer:

Attached below

Explanation:

Free energy of mixing = ΔGmix = Gf - Gi

attached below is the required derivation of the

a) Molar Gibbs energy of mixing

ΔGmix = Gf - Gi

hence : ΔGmix = ∩RT ( X1 In X1 + X2 In X2 + X3 In X3 + ------- )

b) molar excess Gibbs energy of mixing

Ni = chemical potential of gas

fi = Fugacity

N°i = Chemical potential of gas when Fugacity = 1

ΔG = RT In ( a2 / a1 )  

Answer:

pH = 12.5

Explanation:

The reaction that takes place is

The OH⁻ species come from the metal hydroxide of the solution, and Pb(OH)₂ is the precipitate.

Now we convert 3.81 grams of Pb(OH)₂ into moles, using its molar mass:

Now we convert 0.0158 Pb(OH)₂ moles into OH⁻ moles, using the stoichiometric coefficients of the reaction:

With the given concentration (1 L), we calculate [OH⁻]:

Then we calculate the pOH of the solution:

And finally we calculate the pH:

Answer:

Particle Symbol Mass

electron e- 0.0005486 amu

proton p+ 1.007276 amu

neutron no 1.008665

Answer:

0.13653499904751903

Explanation:

Convert Units .com

Explanation:

The reaction is as follows:

2Mg(s) + O2(g) ---> 2MgO(s)

and the researcher said that 32 g of MgO was produced.

Stoichiometry:

28 g Mg × (1 mol Mg/24.305 g Mg) = 1.15 mol Mg

15 g O2 × (1 mol O2/15.999 g O2) = 0.938 mol O2

1.15 mol Mg × (2 mol MgO/2 mol MgO) = 1.15 mol MgO

1.15 mol MgO × (40.3044 g MgO/1 mol MgO) = 46.6 g MgO

0.938 mol O2 × (2 mol MgO/1 mol O2) = 1.88 mol MgO

1.88 mol MgO × (40.3044 g MgO/1 mol MgO = 75.6 g MgO

Based on these numbers, the amount of product after the reaction is much less than expected so these results don't seem to support the law of conservation of matter.

Answer:

D

Explanation:

I think it's D but not 100% sure

The pressure that pushes electrons to the cathode is derived from the negative charge of electrons at the anode. Hence, option B is correct.

An electrolytic cell is a type of electrochemical cell that undergoes non-spontaneous reactions by deriving the energy in the form of voltage from external sources.

A voltaic cell is a cell in which chemical reactions are used to produce electrical energy in form of current.

Such a cell is made up of two electrodes and their electrolytes. The electrodes are connected via a salt bridge. The salt bridge allows electrons to move between the electrodes.

In a voltaic cell, an oxidation reaction occurs in the anode. During oxidation, electrons are produced. Therefore, the Na electrode in the anode will lose an electron spontaneously. At the cathode, reduction occurs. The Iron electrode here will gain the electron produced by the oxidation reaction at the anode. The salt bridge moves the electrons from the anode to the cathode.

Hence, the pressure that pushes electrons to the cathode is derived from the negative charge of electrons at the anode.

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Answer:

Convection

Explanation:

Answer:

Solubility in water Anhydrous: 74.5 g/100 mL (20 °C) Hexahydrate: 49.4 g/100 mL (−25 °C) 59.5 g/100 mL (0 °C) 65 g/100 mL (10 °C) 81.1 g/100 mL (25 °C) 102.2 g/100 mL (30.2 °C) α-Tetrahydrate: 90.8 g/100 mL (20 °C) 114.4 g/100 mL (40 °C) Dihydrate: 134.5 g/100 mL (60 °C) 152.4 g/100 mL (100 °C)

Answer:

1: b

2: in the article it says that the benefits from the drug outweigh the costs, so it think it is effective.

Answer:

A substance that can conduct electricity in solution

Answer:

Explanation:

A childs lung can hold .11mols/ per 2.8 L so that gives us a molarity of .039M

A adults lungs can hold .18 mols /per 4.6 so that gives us .039M aswell meaining that the lung capacity between the two is not different.

The pressure of a container with a volume of 8.95 L holds 0.155 mol of N₂ at 23°C is  42.64 atm.

Ideal gas law is also called as perfect gas law. It is represent by the equation PV = nRT, where, 'P' is the pressure, 'V' is the volume in liters, 'n' is the number of particles in moles, 'T' is the temperature in Kelvin and 'R' is the ideal gas constant.

By ideal gas equation,

PV = nRT

Where,

P = Pressure

V = Volume

n = Number of moles

R = gas constant

T = Temperature

First convert temperature into kelvin

23°C + 273 = 296.15K

By putting given value in ideal gas equation we can solve this problem

P × 8.95 = 0.155 × 8.314 × 296.15 ÷ 8.95

= 381.64 ÷ 8.95

= 42.64 atm

Thus, The pressure of a container with a volume of 8.95 L holds 0.155 mol of N₂ at 23°C is  42.64 atm.

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Answer:

ik ppl sy no links but https://courses.lumenlearning.com/cheminter/chapter/the-ph-scale/

Explanation: it should help you

To solve this we must be knowing each and every concept related to ore and bauxite. Therefore, Bauxite is best used for making wires. The correct option is option B.

Aluminum's primary source of supply is bauxite. Due to its small weight and ease of molding into fine wire or sheets, aluminum is particularly useful.

All across the world, bauxite may be found. The greatest deposits of this ore are in Australia and Guinea, an African nation. Although bauxite was initially found in France, it may now be found all over the world, such as the Caribbean.

Therefore, Bauxite is best used for making wires. The correct option is option B.

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Answer:

uhhh D  .-.

Explanation:

Answer:C

Explanation:

How does a river form a delta?

Deltas are wetlands that form as rivers empty their water and sediment into another body of water. ... Deltas are wetlands that form as rivers empty their water and sediment into another body of water, such as an ocean, lake, or another river. Although very uncommon, deltas can also empty into land.

Answer:

Some clouds form as air warms up near the Earth's surface and Rises heated by Sunshine the ground heats the air just above it that warm air starts to rise because when warm it is lighter and less dense than the air around it as it rises its pressure and temperature drop causing water vapor to condense.

When airborne water vapor condenses into observable water droplets or ice crystals, clouds are created.

Condensation is most likely the cause of cloud formation. The transformation of airborne water vapor into a liquid or solid state is known as condensation. When the air is cooled or the pressure of the water vapor is raised, this occurs.

Water vapor from the Earth's surface is constantly evaporating into the atmosphere. When this water vapor rises, it cools in the atmosphere. The pressure of water vapor rises as the air cools. Water vapor will condense on minute airborne particles like dust, pollen, or salt crystals when the water vapor pressure reaches a particular level.

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Answer:

1.54grams

Explanation:

Molarity of a solution = n/V

Where;

n = number of moles (mol)

V = volume (L)

Based on the information given in this question;

Volume of NaOH solution = 5.0 × 10ml

= 50ml = 50/1000 = 0.050 L

Molarity = 0. 77 M

Using; Molarity = n/V

0.77 = n/0.05

n = 0.77 × 0.05

n = 0.0385mol

To find the mass (grams) of NaOH in the solution, we use the following formula:

mole (n) = mass/molar mass

Molar mass of NaOH = 23 + 1 + 16 = 40g/mol

0.0385 = mass/40

mass = 0.0385 × 40

mass = 1.54grams.

mesozoic era - age of the dinosaurs

end of the paleozoic era - most of earth a desert

end of the mesozoic era - a layer of iridium deposited all over earth

The time frame can be matched with characteristic as:

Matching is the placing of terms with their meaning or their best fit.

From the question, we can see that mesozoic era was associated with age of the dinosaurs, and paleozoic era is associated with earth in desert.

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Answer:

It's IF5. ................

Given :

Molarity of acetic acid solution, M = 0.10 M.

pKa of acetic acid, pKa = 4.75 .

To Find :

Percentage dissociation of 0.10 M solution of acetic acid.

Solution :

We know, [tex]pK_a = -log\ K_a[/tex]

Taking antilog both side, we get :

[tex]K_a = 1.78\times 10^{-5}[/tex]

Since, acetic acid has 1 hydrogen atom to loose , so it is a monoprotic acid.

Now, percentage dissociation of monoprotic acid is given by :

[tex]\alpha = \sqrt{\dfrac{K_a}{C}}\\\\\alpha =\sqrt{ \dfrac{1.78\times 10^{-5}}{0.1}}\\\\\alpha = 0.0133\times 100 = 1.33 \%[/tex]

Hence, this is the required solution.

Answer:

Following are the responses to the given choices:

Explanation:

The most soluble substances gives more number of particles in solution. 1.0 M of sodium sulphate contains most particles here.

Solubility of a solute is the fraction of its concentration which is dissolved in a solvent. When solutes dissolved in solvent the dissociates into ions.

Solubility of a substance depends on the temperature, pressure, bond type and molecular weight of the compound. The no.of particles produced by a molecule when dissolved vary from compound to compound.

Glucose and ethylene glycol partially dissolves in water and they give only one particle as such and does not form ions.

Potassium chloride gives one K⁺ ions and Cl⁻ ions and magnesium sulphate gives one Mg²⁺ and SO₄²⁻ ions. Whereas, sodium sulphate (Na₂SO₄) gives two sodium ions and one sulphate ion.

Hence, more particles are produced when sodium sulphate is dissolved in water. Therefore, 5th option is correct.

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Answer:

all non metals

Explanation:

iodine is a non metal, and if a metal had bonded with it, it would he considered a metal and non metal. But since two iodine atoms are bonded together, they are both non metals ( I2)

Answer:

Valence electrons are the number of electrons in an outer shell of an atom that can participate in forming chemical bonds with other atoms.

For the given reaction, according to Le -Chatlier principle adding a catalyst will bring the reaction to the right. Removing the hydrogen gas shift  the equilibrium to the left and increasing pressure also shift to right.

According to this principle, when some a disorder is affecting the equilibrium of the system. The system balanced the factors which created the disorder and make  a new equilibrium.

A catalyst always helps to proceed the reaction in the forward direction. Thus adding a catalyst shift the equilibrium to the right.

If any  reactant or produced is removed from the system, the system shifts to the equilibrium to that direction in which they are producing. Removing hydrogen gas will then shift the reaction to the right to produce more hydrogen.

Increasing pressure shift the equilibrium to those direction in which the number of number of moles of gases decreases. Hence, the reaction shifts to the right here.

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Answer:

10.67 moles is the answers.hope it helped