If ΔH = -50.0 kJ and ΔS = -0.300 kJ/K , the reaction is spontaneous below a certain temperature. Calculate that temperature.

Answers

Answer 1

Answer: The basis for spontaneous reactions and their dependence on temperature is given by the equation for the Gibbs Free energy:

ΔG = ΔH – TΔS < 0

For a spontaneous reaction to occur, ΔG must be negative. Following the equation, ΔH must be < 0, and ΔS must be > 0 for a reaction to be spontaneous at all temperatures. However, the given values have a negative value for both enthalpy and entropy. This means that spontaneity can only occur below a certain temperature, which can be calculate by setting ΔG as zero. This gives:

ΔG = ΔH – TΔS = 0

T = ΔH/ΔS = -50/-0.3 = 166.67 Kelvin

Anything below that temperature gives a negative ΔG, making it spontaneous.

Answer 2

Answer:

Final answer:

The reaction is spontaneous at temperatures greater than 166.7 K.

Explanation:

To determine the temperature at which the reaction is spontaneous, we can calculate the Gibbs free energy change (ΔG) using the equation ΔG = ΔH - TΔS, where ΔH is the enthalpy change and ΔS is the entropy change. Since the reaction is spontaneous below a certain temperature, we can assume that at this temperature, ΔG is negative. Thus, we have -50.0 kJ - T(-0.300 kJ/K) < 0. Solving for T, we find that the reaction is spontaneous at temperatures greater than 166.7 K.

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What will most likely happen when two bromine atoms bond together?

Answers

Bromine is a chemical element in the periodic table with atomic number 35 and mass 79.9 units. When two bromine atoms are brought together they are likley to form a bromine molecule that will consist of the two orginal atoms bound together by a single covalent bond.

Ionic bonding is the entire exchange of valence electron(s) between particles. It is a kind of substance security that creates two oppositely charged particles. In ionic bonds, the metal loses electrons to wind up plainly an emphatically charged cation, though the nonmetal acknowledges those electrons to end up noticeably a contrarily charged anion.

A student makes a ball-and-stick model of a propane molecule, as shown below. The black balls represent carbon atoms, and the white balls represent hydrogen atoms.

Answers

Answer:

Explanation:

No sure I tried

Final answer:

A propane molecule's structure can be understood through the ball-and-stick model where carbon and hydrogen atoms play distinct roles leading to different alkyl groups.

Explanation:

The ball-and-stick model of a propane molecule is built using black spheres to indicate carbon atoms and white spheres for hydrogen atoms. In propane, each of the six equivalent white spheres (hydrogen atoms) are bonded to a black sphere (carbon atom) connected to one other black sphere (carbon atom). The remaining two hydrogen atoms are of a different type as they are bonded to a carbon atom (black sphere) that is bonded to two other carbon atoms. They are represented as purple spheres in this explanation. Adjacently, in 2-methylpropane, we find nine similar hydrogen atoms, but notably, one that differs - represented as a green sphere which is bonded to a carbon atom connected to three other carbon atoms. This unique arrangement allows for the formation of different alkyl groups when certain hydrogen atoms are removed.

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Help please!!!! I only have a couple mins

Answers

Answer:

D i am prety shure

Explanation:

Answer:-D

Explanation:

You fill a rigid steel cylinder that has a volume of 20.0 L with nitrogen gas to a final pressure of 2.00 *10^4 Kpa at 28c How many kilograms of N2 does the cylinder contain

Answers

The quantity of nitrogen the cylinder contains is 4477.8 g

What is pressure?

Pressure is a force exerted in a perpendicular direction in any item.

By ideal gas law

PV = nRT

$P =(w)/(M) =(RT)/(V)\n$

w = mass

Volume is 20.0 l

Pressure is $2.00 * 10^4 \;Kpa$

The molar mass of nitrogen is 28 g/mol

R is gas constant = 0.0821

Temperature is 28 converted into kelvin that is 301 k

Putting the values

$197.6 =(w)/(28) =(0.0821 * 301 )/(20\;l)\n\nw = 4477.8 g$

Thus, the mass of nitrogen is 4477.8 g.

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Answer : The mass of $N_2$ gas is, 4477.8 g

Solution :

using ideal gas equation,

$PV=nRT\n\nP=(w)/(M)* (RT)/(V)$

where,

n = number of moles of gas

w = mass of gas

P = pressure of the gas = $2* 10^4Kpa=197.6atm$

conversion : $1atm=101.2Kpa$

T = temperature of the gas = $28^oC=273+28=301K$

M = molar mass of $N_2$ gas = 28 g/mole

R = gas constant = 0.0821 Latm/moleK

V = volume of gas = 20 L

Now put all the given values in the above equation, we get the mass of gas.

$197.6atm=(w)/(28g/mole)* (0.0821Latm/moleK* 301K)/(20L)$

$w=4477.8g$

Therefore, the mass of $N_2$ gas is, 4477.8 g

Write the complete name (prefix + unit) for each of the following numerical values:a) 0.10 g

b) 1 × 10^-6 g

c) 1000 g

d) 0.01 g

e) 0.001 g

f) 1 × 10^9 g

Answers

The (standard) unit of mass is gram. So, the complete name of each of the units is the name of the numerical value followed by the term "gram".

The complete names are:

1 decigram
1 microgram
1 kilogram
1 centigram
1 milligram
1 gigagram

In numerical representation of numbers, the meaning of the given numbers are:

$0.10 \to$ deci

$10^(-6) \to$ micro

$1000 \to$ kilo

$0.01 \to$ centi

$0.001 \to$ milli

$10^9 \to$ giga

To complete the names, we simply add "gram" to the above representations. So, we have:

$0.10 \to$ decigram

$10^(-6) \to$ microgram

$1000 \to$ kilogram

$0.01 \to$ centigram

$0.001 \to$ milligram

$10^9 \to$ gigagram

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In an aqueous solution, a chloride ion is attracted to which end of the water molecule?

Answers

Answer : In an aqueous solution, a chloride ion is attracted to the hydrogen end of the water molecule.

Explanation :

The meaning of aqueous solution is the solution in which the solvent is water. In water molecule $H_2O$ , oxygen atom is more electronegative than the hydrogen atom. That means, the hydrogen in the water molecule has partial positive charge and oxygen has partial negative charge.

As the chloride ion have the (-1) negative charge. So, it will be attracted towards the positive charge that is hydrogen end of the water molecule because opposite charges attract to each other.

Hence, in an aqueous solution, a chloride ion is attracted to the hydrogen end of the water molecule.

The end with the hydrogen atoms because the chloride ion is negatively charged while the hydrogen is positive. Hope this helps

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