how many grams of magnesium must react with phosphoric acid to produce 100 L of hydrogen gas

If HCl dissolves exothermically, a decrease in temperature increases solubility, while an increase in temperature decreases solubility.

If HCl dissolves exothermically, a decrease in temperature would increase the solubility of the compound, while an increase in temperature would decrease the solubility. This is because solubility is typically favored at lower temperatures for exothermic processes, while an increase in temperature will tend to shift the equilibrium towards the dissociated state of the compound.

The reason for this can be explained by Le Chatelier's principle, which states that a system at equilibrium will adjust its response to counteract any changes in its conditions. When HCl dissolves exothermically, heat is released as the compound dissolves, and so a decrease in temperature would be seen as a shift in the conditions that favor the dissolving of HCl. The system would then respond by shifting the equilibrium towards the side of the reaction that absorbs heat, which is the dissolution of HCl. This would result in an increase in solubility.

Conversely, when the temperature is increased, the system responds by shifting the equilibrium towards the side of the reaction that releases heat, which in this case is the undissociated state of HCl. As a result, the solubility of HCl would decrease with an increase in temperature.

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In this question, we need to find the value of pressure of a 15 grams sample of CO2 gas, and in order to find this value, we will be using the Ideal gas law formula, which is the following:

PV = nRT

Where:

P = pressure in atm

V = volume in liters, 20 Liters

n = number of moles

R = gas constant, 0.082

T = temperature in kelvin, 0°C = 273 K

The number of moles we need to find based on the mass in the question and based on the molar mass of CO2, 44g/mol:

44g = 1 mol

15g = x moles

44x = 15

x = 15/44

x = 0.34 moles of CO2 in 15 grams

Now we have the values to add to the formula:

P * 20 = 0.34 * 0.082 * 273

20P = 7.61

P = 7.61/20

P = 0.38 atm of pressure

The pressure will be 0.38 atm

Answer: B longer wave

Explanation:

because

Answer:

D

Explanation:

Lamps

i think it is D i hope this helps yall

Element B has an atomic weight of 26.67 g/mol, and element A has an atomic weight of 91.22 g/mol, which means that element B is niobium (Nb), whose atomic weight is 92.91 g/mol.

To solve this problem, we need to use the information given about the compositions of the intermetallic compounds A3B and AB3 and the identity of element A, which is zirconium (Zr).

Let x be the atomic weight of element B.

In A3B, the composition is 91.0 wt% A and 9.0 wt% B. This means that the atomic weight of A is 91.0/atomic weight of A3B and the atomic weight of B is 9.0/atomic weight of A3B. Using the atomic weight of zirconium, which is 91.22 g/mol, we can set up the following equation:

91.0/91.22 + 9.0/x = 3/1

Simplifying this equation, we get:

0.9974 + 9.0/x = 3

Multiplying both sides by x, we get:

0.9974x + 9.0 = 3x

Solving for x, we get:

x = 26.67 g/mol

Therefore, element B has an atomic weight of 26.67 g/mol.

In AB3, the composition is 53.0 wt% A and 47.0 wt% B. Using the atomic weight of zirconium and the atomic weight of element B, we can calculate the atomic weight of A as follows:

53.0/91.22 + 47.0/x = 1/3

Simplifying this equation, we get:

0.5817 + 47.0/x = 0.3333

Multiplying both sides by x, we get:

0.5817x + 47.0 = 0.3333x

Solving for x, we get:

x = 121.08 g/mol

Therefore, element B has an atomic weight of 26.67 g/mol, and element A has an atomic weight of 91.22 g/mol, which means that element B is niobium (Nb), whose atomic weight is 92.91 g/mol and is closest to our calculated atomic weight of 26.67 g/mol.

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The correct statement about molecular orbital (MO) theory is: d. A π∗ (pi star) antibonding molecular orbital is higher in energy than the two atomic p orbitals from which it is formed.

In MO theory, when two atomic orbitals combine, they form molecular orbitals. There are two types of molecular orbitals: bonding and antibonding. Bonding molecular orbitals result from the constructive interference of atomic orbitals, leading to lower energy and increased stability. Antibonding molecular orbitals, on the other hand, form due to the destructive interference of atomic orbitals, resulting in higher energy and decreased stability.

For statement d, when two p orbitals of similar phase overlap side-by-side, a π bonding molecular orbital is formed, not an antibonding molecular orbital as stated in option a. Statement b is incorrect because a π bonding molecular orbital forms when two p orbitals of similar phase overlap side-by-side, not of opposite phase. Finally, statement c is incorrect because a π bonding molecular orbital is lower in energy, not higher, than the two atomic p orbitals from which it is formed.

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Heat packs are used to relax muscles. This reaction is an example of exothermic reaction.

Exothermic reaction is defined as a reaction that is chemical in nature and is characterized by the release of energy in the form of heat and light.

It can also be defined as a thermodynamic process or reaction that releases energy from system to its surroundings.

Endothermic reaction is defined as the chemical reaction in which the reactants absorbs heat energy from the surroundings to form product.  

Endothermic reaction can also be defined as a reaction in which the system absorbs energy from its surroundings in the form of heat.

Being endothermic enables us to live in cooler environments and regulate our body temperatures in order to fight infection.

Thus, heat packs are used to relax muscles. This reaction is an example of exothermic reaction.

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Answer:

313.15

Explanation:

Answer:

Explanation:

The photosynthetic equation is as follows:

6CO2 + 6H2O = C6H12O6 + 6O2

According to this equation, 6 moles of water (H2O) is required to produce 1 mole of glucose

Answer:

Hmm 65

Explanation:

Answer:

Mg(HCO3)2 + 2HCl → 2CO2 + 2H2O + MgCl2

Explanation:

Mg(HCO3)2 + 2HCl → 2CO2 + 2H2O + MgCl2

For AABC AQPR to be true, the measures of angles A, C, and D must all be equal; in this case, they must all be equal to 81°. Therefore, conditions A, C, and D are sufficient to show that AABC AQPR.

Angles are points in a plane that are formed when two lines intersect. They can also be formed when one line rotates around a fixed point. Angles are measured in degrees and can be equal to, greater than, or less than a right angle (90°). The four main types of angles are acute (less than 90°), right (90°), obtuse (greater than 90°), and straight (180°). Angles can also be classified as complementary, supplementary, vertical, alternate, and adjacent.

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Answer:

it's C

Explanation:

because it exhaled the carbon dioxide

A gas exerts pressure as a result of collisions of the gas molecules with the walls of the container.

What is an Ideal gas?

An ideal gas is a hypothetical gas that perfectly complies with the gas laws since its molecules take up very little space and don't interact

No attraction or repellence exists between the molecules of ideal gases. The sole interaction between molecules of an ideal gas would be an elastic collision when they collided or an elastic collision with the container walls.

The molecules of an ideal gas have no volume. The molecules of the gas take up the volume because they spread out over a broad area of space, whereas the molecules of an ideal gas are represented as point particles with no volume on their own.

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Answer:

Magnesium

Explanation:

Answer: 3.0 kJ × 1 mol/40.65 kJ× 18.02 g/mol × 1 mL/1 g= 1.3 mL

The Baeyer permanganate test and chromic acid tests work by converting an aldehyde to a carboxylic acid functional group.

KMnO₄ and H₂CrO₄ act as oxidizing agents. A ketone does not react with these reagents because it does not have a hydrogen atom attached to the carbonyl group.

The Baeyer permanganate test is used to identify the presence of unsaturation (i.e. double bonds) in a compound. When a double bond is present in the compound, it will be oxidized by potassium permanganate (KMnO₄) to form a diol functional group. In the case of aldehydes, the double bond is present between the carbonyl carbon and the hydrogen atom.

Therefore, the reaction will convert an aldehyde to a carboxylic acid functional group. This reaction is also known as the oxidation of aldehydes with KMnO₄.

The chromic acid test is another method for identifying the presence of unsaturation in a compound. It uses chromic acid (H₂CrO₄) as the oxidizing agent. Like the Baeyer permanganate test, the chromic acid test will convert an aldehyde to a carboxylic acid functional group. It is important to note that the chromic acid test is more sensitive to the presence of double bonds than the Baeyer permanganate test.

Therefore, it is often used as a confirmatory test after a positive result is obtained from the Baeyer permanganate test.

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The value of Kp for the given reaction is 12.2 atm. We can find it in the following manner.

PART A:

The hydrolysis reaction of antimony trichloride can be written as follows:

SbCl₃ + 3H₂O ⇌ Sb(OH)₃ + 3HCl

The equilibrium constant expression for this reaction can be written as:

K = [Sb(OH)₃][HCl]³ / [SbCl₃][H₂O]₃

The concentration of SbCl₃ is given as 0.046 M, and the concentration of HCl is given as 2.1 M. Assuming the volume of water used for dilution is negligible, the concentration of H2O can be considered to be 55.5 M (at 25 ˚C). The concentration of Sb(OH)₃ can be calculated using the stoichiometry of the reaction:

0.046 M SbCl3 x (1 mol Sb(OH)3 / 1 mol SbCl₃) = 0.046 M Sb(OH)₃

Substituting the given values into the equilibrium constant expression, we get:

K = (0.046 M) x (2.1 M)³ / (1)³x (55.5 M)³

K = 1.7 x 10⁻¹⁰

Therefore, the equilibrium constant, K, for the hydrolysis of antimony trichloride is 1.7 x 10⁻¹⁰.

PART B:

To calculate Kp for the given reaction, we can use the relationship between Kc and Kp, which is:

Kp = Kc(RT)^Δn

where R is the gas constant (0.0821 L atm mol⁻¹ K⁻¹), T is the temperature in Kelvin, and Δn is the difference between the total number of moles of gaseous products and the total number of moles of gaseous reactants.

In this case, Δn = (2 - 1 - 1) = 0, since the total number of moles of gaseous products (2 moles of NOBr) is equal to the total number of moles of gaseous reactants (1 mole of N2, 1 mole of O2, and 1 mole of Br2).

Substituting the given values into the equation for Kp, we get:

Kp = (448)(0.0821 L atm mol^-1 K⁻¹)(296 K)⁰

Kp = 12.2 atm

Therefore, the value of Kp for the given reaction is 12.2 atm.

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Tungsten is an element. It is located in the d -block of periodic table. Thus it is a transition metal. Hence, option B is correct.

Tungsten is 74th element in periodic table. It is a transition metal thus, located in the d-block of periodic table. Tungsten has the chemical symbol W. Tungsten was first identified as an element in 1781.

The maximum melting temperature of any known element other than carbon, 3,422 °C, is reached by the unbound element, making its resistance all the more remarkable (which sublimes at atmospheric pressure). Tungsten has a boiling point of around 5930°C.

A few of the many alloys that contain tungsten and have many applications include radiation shielding, X-ray tubes, electrodes in gas tungsten arc welding, superalloys, and incandescent light bulb filaments.

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Answer:

The volume of the gas is 0.015 m^3.

Explanation:

mass, m = 32 g

Temperature, T = 45 °C = 45 + 273 = 318 K

Pressure, P = 728 mm of hg = 0.728 x 13.6 x 1000 x 9.8 = 97027.84 Pa

Atomic mass = 4 x 12 + 10 x 1 = 58 g

Use the ideal gas equation

Let the volume is V.

P V = n R T

\(97027.8 \times V = \frac{32}{58}\times 8.31 \times 318 \\\\V = 0.015 m^3\)  

Explanation:

The volume of the gas occupied can be calculated by using the ideal gas equation:

\(PV=nRT\)

where,

P=pressure of the gas in atm

V=volume of the gas in L.

n=number of moles of the gas

R=0.0821L.atm.mol-1.K-1

T=absolute temperature

To get the volume of the gas, follow the below steps:

1) Calculate the number of moles of gas:

Number of moles of butane=mass of butane given/its molecular mass

\(=32g/58.0g/mol\\=0.55mol\)

2) Convert temperature into kelvin scale:

T=(45+273)K=318K

3)Convert pressure into atm:

760 mm Hg =1 atm

then,

728 mm Hg=

728 mm Hg x 1 atm /760 mm Hg

=0.957 atm

Substitute all these values in the ideal gas equation to get the volume:

\(V=\frac{nRT}{P} \\V=0.55mol x 0.0821 L.atm.mol-1.K-1 x 318K / 0.957 atm\\V=15.0L\)

Answer:

The volume of butane gas is 15.0 L

The intermolecular force that is common to both is the dipole forces

b) The lesser molecular mass of \(SeOF_{2}\) made it to have a lesser boiling point.

We know that apart from the forces that holds the atoms together in a molecule, there is yet another force that holds the molecules together in a particular state of matter. Let us recall that matter is anything that has mass and occupy space.

If we look at the two compounds that we have, it is clear that the commonality between the two compounds is that the both of them are held together by the dipole forces because the molecules are composed of atoms that are polar.

On the other hand, there is a dispersion force that is found in every molecule. The magnitude of the dispersion forces depends on the molecular mas of the molecule. Given that \(SeOCl_{2}\) has a greater molecular mass than \(SeOF_{2}\), it would necessarily have  grater boiling point than the later.

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Answer:

i would assume i mean who has cold farts

Explanation:

Yes, farting is an example of an exothermic reaction.

A reaction that is chemical in nature and is characterized by the release of energy in the form of heat or light is called an exothermic reaction.

Farting is a normal part of digestion that reflects the activity of the bacteria in your gut.

Yes, farting is an example of an exothermic reaction.

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The element is most likely to react with Br is Li(Lithium). Alkali metals have very low density, which makes them very reactive, because they want to gain energy and become stable.

Lithium is an alkali metal which belongs to group 1 . Bromine (Br) reacts with many metals, sometimes very vigorously. For instance, with potassium, it reacts explosively. Bromine even combines with relatively unreactive metals, such as platinum and palladium. The elements toward the bottom left corner of the periodic table are the metals that are the most active in the sense of being the most reactive. Lithium, sodium, and potassium all react with water, for example.

Out of the given elements the correct choice is Li.

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An enzyme serves as a place where a chemical reaction can occur because the correct option is d. the shape of the substrates fits perfectly into the shape of the enzyme's active site.

The Enzymes are the proteins that help to speed up the chemical reactions in our bodies. The Enzymes are the essential for the digestion, the liver function and much more. The substrate is the substance on which the enzyme operates in an enzymatic reaction.

Thus, the shape of the substrates will fits perfectly into the shape of the enzyme's active site, this is the reason enzyme serves as the place where the chemical reaction can occur.

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Answer:Shortwave radio frequencies are not affected and pass through the ionosphere.

Explanation:

The following adjustment would result in further precipitation of the given equilibrium: Decreasing the concentration of OH

The given equilibrium reaction is shown below:mn(oh)2(s)↽−−⇀mn2 (aq) 2oh−(aq)According to the Le Chatelier’s principle, if a stress is applied to a system at equilibrium, the equilibrium will shift in a direction that reduces the stress. So, in order to shift the equilibrium in the forward direction, stress must be applied to the reverse reaction.

This can be done by decreasing the concentration of OH- ions which will result in the precipitation of more Mn(OH)2. Hence, decreasing the concentration of OH- will result in further precipitation of the given equilibrium.In other words, when the concentration of hydroxide ions is reduced, the Mn2+ and OH- ions will react with each other in the forward direction to compensate for the loss of hydroxide ions.

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Answer:

Number of nesting turtles

Explanation:

The dependent variable is the Number of nesting turtles.

The lunar phase may also affect leatherback nesting visually. On clear nights when the Moon is full, visibility may be greater and the presence of tourists and egg predators may discourage turtles from emerging.

When making their way back to the ocean, sea turtles use the light of the Moon and stars to navigate. Sea turtles use the light of the Moon and stars to navigate. Artificial lighting from street lights, buildings, and flashlights on the beach can disrupt their ability to find their way back to the water

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