Calculate the pressure exerted by 0.3m of arcetic in a 2l container at 40°C
Tc= 319.55°C.
Pc= 57.054atm​

Answer:

In 100 g of ascorbic acid, we will have 40.92 g C, 4.58 g H, and 54.50 g O. The whole-number ratio gives us the subscripts for the empirical formula. Thus, the empirical formula is C3H4O3.

Explanation:

Answer: Hope this helps

Explanation:

The table below lists the chemical and physical features of sodium fluoride (NaF), sulfite (CS2), and calcium iodide (CaI2):

Scientists can easily identify the properties of specific features, like its mass, electron number, and electron, thanks to the periodic table's organization.

At normal temperature, CaI2 is a solid, CS2 is a liquids, and NaF is a stable.

Melting Point: CaI2, CS2, and NaF all have high melting temperatures of 819°C, -110.8°C, and 993°C, respectively.

Boiling Point: The specific heats of CaI2, CS2, and NaF are 1,309°C, 46.3°C, and 1,705°C, respectively.

Water Reactivity: CaI2 combines with water to produce calcium hydroxide and hydroiodic acid. As CS2 cannot disintegrate in water, it does not mix with it. NaF interacts with water to generate alkaline solution and hydrofluoric acid.

CaI2 is a salt that decomposes in water to produce calcium metal ions and iodide anions, giving it acid-base properties. In water, the acid CS2 and the basic salt NaF separate to produce sodium metal ions and fluoride anions.

To know more about periodic table visit:

https://brainly.com/question/11155928

#SPJ1

The structure of the compound is shown in the image attached

The molecular formula gives information about the types and number of atoms in the compound. This can be used to determine the possible functional groups and the degree of unsaturation (the number of rings or double bonds) in the compound.

When we look at the name of the compound, we can be able to tell the bonds and the substituents that we have in the compound and that would help us to deduce its structure.

Learn more about organic compound:https://brainly.com/question/5994723

#SPJ1

Explanation:

We can use the formula for calculating the heat absorbed by a substance to find its specific heat:

q = mcΔT

where q is the heat absorbed, m is the mass of the substance, c is its specific heat, and ΔT is the change in temperature.

We can first calculate the change in temperature:

ΔT = 124.2 °C - 28.1 °C = 96.1 °C

Next, we can substitute the given values into the formula and solve for c:

1585 J = (45.58 g) c (96.1 °C)

c = 1585 J / (45.58 g × 96.1 °C)

c = 0.357 J/g⋅∘C

Therefore, the specific heat of the substance is 0.357 J/g⋅∘C.

The mass of oxygen produced when 1.840 mol of H2O2 decomposes is 29.44g and the mass of water produced when 5.0 mol O, is produced by this reaction is 180.02g.

Given  that the Hydrogen peroxide breaks down, releasing oxygen as:

[tex]2H2O2(g) -- > 2H2O(1) + O2(g)[/tex]

a.) The mass of oxygen is produced = m

Given the number of moles of H2O2 = 1.840

We know  The molecular weight of H2O2 is  = 34.01 g/mol

the molecular weight of O2 is = 32.00 g/mol.

We know that number of moles is equal to mass of substance divided by its molar mass such that:

number of moles of O2 = 1.840 mol H2O2 x (1 mol O2 / 2 mol H2O2)

The mass of O2 =  0.920 mol O2 * 32 g/mol O2 = 29.44g

b.) Given the number of moles of O = 5.0

Then number of moles of H2O produced = 5.0 mol O2 x (2 mol H2O / 1 mol O2) = 10 mol H2O

mass of H2O produced =  10 mol H2O * (18.02 g H2O / 1 mol H2O) = 180.02 g H2O

To learn more about moles click here https://brainly.com/question/26416088

#SPJ1

The statement that is not true about what happens in all chemical reactions is as follows: the ways in which atoms are joined together are changed (option A).

Chemical reaction is a process, typically involving the breaking or making of interatomic bonds, in which one or more substances are changed into others.

A chemical reaction is different from physical change being that a chemical reaction involves the breaking of bonds in the substance called reactants to form new substances called products.

Characteristics of a chemical reaction are as follows:

Learn more about chemical reaction at: https://brainly.com/question/29039149

#SPJ1

the final pressure of the gas inside the cylinder is 784 mm Hg.

What is Boyle's law?

To solve this problem, we can use Boyle's Law, which states that the pressure of a gas is inversely proportional to its volume at constant temperature. Mathematically, this can be written as:

P1V1 = P2V2

where P1 and V1 are the initial pressure and volume, and P2 and V2 are the final pressure and volume.

Substituting the given values into the equation, we get:

3060 mm Hg x 0.520 L = P2 x 2.03 L

P2 = (3060 mm Hg x 0.520 L) / 2.03 L

P2 = 784 mm Hg

Therefore, the final pressure of the gas inside the cylinder is 784 mm Hg.

The answer is (B) 784 mm Hg.

To know more about Boyle's law visit :-

https://brainly.com/question/1696010

#SPJ9

According to the question the partial pressure of nitrogen is 704.7 mmHg.

Pressure is a physical quantity that describes the amount of force applied to an object per unit area. It is measured in units of force per unit area, such as pascals (Pa) or pounds per square inch (psi). Pressure is an important factor in many scientific fields such as thermodynamics, fluid dynamics, and mechanics. Pressure is also a measure of how much energy is stored in a given material or system. Pressure is a scalar quantity, meaning that it has a magnitude but no direction. Pressure can be created by a number of sources, such as gravity, the exertion of force, and the application of heat.

The partial pressure of nitrogen is equal to the total pressure of the system minus the vapor pressure of water vapor. In this case, the total pressure is 760.0 mmHg, and the vapor pressure of water at 40°C is 55.3 mmHg. Thus, the partial pressure of nitrogen is:

Partial pressure of nitrogen = 760.0 mmHg - 55.3 mmHg = 704.7 mmHg

To learn more about pressure

https://brainly.com/question/25736513

#SPJ1

The amount of ions is caculated by, the formula of follows [tex]$$c=M \times V$$[/tex][tex]$C$[/tex] is the amount [tex]$M$[/tex] is the molarity and[tex]$V$[/tex] is the volume.

In the chemical reaction, the reaction bate is the change in concentration of reactant per unit time. The time for a reaction is calculated by the formula of fallers.

Convey the volume from  [tex]$m L$ to $L$[/tex] by the conversion factor as follows

[tex]\begin{aligned}1 \mathrm{~mL} & =10^{-3} \mathrm{~L} \\1.80 \times 10^{-10} \mathrm{~mL} & =1.80 \times 10^{-10} \mathrm{mc} \times \frac{10^{-3}}{1 \mathrm{~mL}} \\& =1.80 \times 10^{-13} \mathrm{~mL}\end{aligned}[/tex]

Calculate the time by the eq [tex]$83.464 \times 10^7$[/tex]Io runt, of

[tex]$$\begin{aligned}t & =\frac{83.464 \times 10^7 \mathrm{Na}^{-1} \text { ions }}{5.0 \times 10^7 \mathrm{Na}^{-1} \text { io ry / chanel } \mathrm{s}} \\& =16.69 \text { chanel }-\mathrm{s}\end{aligned}$$[/tex]

The time required is 16.69chanel-s

Learn more about molarity

https://brainly.com/question/8732513

#SPJ4

Answer: (A) acidity

Explanation: Acidity is a measure of how acidic a substance is. pH is a system used to measure the H+ ion concentration in a substance. Using the equation -log([H+]=pH, if given a pH value less than 7, a substance is acidic, and greater than 7 indicates basicity.

Common indicators are phenolphthalein and bromthymol blue which turn different colors depending on the acidity of the solution they're in. This color tells us nothing about the boiling point, density, or electrical conductivity.

Hope this helps!

Answer:

Let x = amount invested in certificate of deposit (in dollars)

Let y = amount invested in corporate bonds (in dollars)

Total amount invested = $100: x + y = 100

CD pays 2% per year, corporate bonds pay 4% per year, total return is 3% per year

Total return on investments = 3% of $100 = $3: 0.02x + 0.04y = 3

Simplifying the equations:

x + y = 100

2x + 4y = 300

Solving for x:

x + y = 100

x = 50

Therefore, the person should invest $50 in the certificate of deposit and $50 in corporate bonds to obtain an overall return of 3% per year.

Explanation:

Answer:

We can use stoichiometry to determine the amount of water produced when 29.3 g of LiOH reacts with CO2.

First, we need to convert 29.3 g of LiOH to moles:

moles of LiOH = mass/molar mass = 29.3 g / (6.941 g/mol + 15.999 g/mol + 1.008 g/mol) = 0.5 mol

From the balanced chemical equation, we see that 2 moles of LiOH react with 1 mole of CO2 to produce 1 mole of H2O. Therefore, we can say:

0.5 mol LiOH × (1 mol H2O / 2 mol LiOH) = 0.25 mol H2O

Now, we can use the molar mass of water to convert moles to grams:

mass of H2O = moles × molar mass = 0.25 mol × 18.015 g/mol = 4.504 g

Finally, we can use the density of water to convert grams to milliliters:

volume of H2O = mass / density = 4.504 g / 0.997 g/mL = 4.52 mL

Therefore, approximately 4.52 mL of water could form from 29.3 g of LiOH.

Quantum numbers are a set of four numbers used to describe the quantum state of an electron in an atom. These numbers specify the energy, orbital shape, orientation, and spin of the electron.

What is Energy Sublevels?

Energy sublevels, also known as subshells, are regions within an energy level where electrons are likely to be found. Each energy sublevel is characterized by a unique shape and orientation in space, and can contain a specific number of electrons.

The energy sublevels within an energy level are arranged in order of increasing energy, with the s sublevel being the lowest in energy and the f sublevel being the highest in energy. The number and arrangement of electrons in an atom's energy sublevels determine its electronic configuration and its chemical and physical properties.

a. When n = 1, there is only one energy level and it contains one s orbital.

b. The 3p sublevel corresponds to the third energy level (n=3) and consists of three p orbitals. The p orbitals are oriented along the x, y, and z axes and can hold a total of 6 electrons (2 electrons per orbital). Therefore, the 3p sublevel contains three p orbitals.

Learn more about Energy Sublevels from given link

https://brainly.com/question/29344931

#SPJ1

Answer:

Not all sugars are bad for you because there are different types of sugars that have different effects on the body.

For example, natural sugars found in fruits, vegetables, and dairy products are considered good sugars because they are accompanied by fiber, vitamins, and minerals that are beneficial for the body. These sugars are also absorbed more slowly by the body, which helps to regulate blood sugar levels and prevent spikes in insulin.

Another example of a good sugar is honey, which contains antioxidants and has antibacterial properties. It is also a natural sweetener that can be used in moderation to add flavor to foods and drinks.

On the other hand, added sugars found in processed foods and drinks are considered bad sugars because they are often high in calories and low in nutrients. These sugars can contribute to weight gain, inflammation, and other health problems when consumed in excess.

Examples of added sugars to avoid include high fructose corn syrup, table sugar, and syrups used in processed foods and drinks. It is important to read food labels and limit intake of added sugars to maintain a healthy diet.

The correct mass of potassium iodide added to the flask is 35g. To calculate the mass of potassium iodide added to the flask, we need to use the formula

mass = volume x concentration x molar mass

volume = 0.10 L (given)

concentration = 2.1 M (given)

molar mass of KI = 166.0028 g/mol (from periodic table)

Substituting these values in the formula, we get:

mass = 0.10 L x 2.1 mol/L x 166.0028 g/mol = 35.001484 g

Rounding off to the correct number of significant digits (two), the mass of potassium iodide added to the flask is:

mass = 35 g (rounded to two significant digits)  

To know more about Mass , visit :

https://brainly.com/question/20887747

#SPJ9

The food web in the image you provided includes a variety of organisms such as producers, consumers, and decomposers. Grasses play an important role in this food web as they are a primary producer.

What is the process by which grasses and other plants convert sunlight into energy in the food chain?

Grasses, like other plants, use photosynthesis to convert sunlight into energy, which they use to grow and produce organic compounds such as sugars and starches. These compounds form the basis of the food chain, providing energy and nutrients for herbivores such as insects, rodents, and large mammals like deer and bison.

In turn, these herbivores are consumed by predators such as snakes, hawks, and wolves, which are then decomposed by scavengers and decomposers such as bacteria and fungi. These decomposers break down the remains of dead organisms and return nutrients to the soil, where they can be taken up by plants like grasses to start the cycle anew.

Therefore, grasses are a critical component of the food web, serving as the foundation for energy flow and supporting the survival of many different species in the ecosystem.

To learn more about food web follow the given link: https://brainly.com/question/15544799

#SPJ1

According to the theory of plate tectonics, plates carry both the oceanic and continental crusts of the Earth's lithosphere.

The lithosphere is the rigid outermost layer of the Earth, which is broken into several large plates that move relative to one another over time.

What is plate tectonics theory?

The plate tectonics theory is a scientific model that explains the movement and behavior of the Earth's lithosphere, which is the rigid outermost layer of the planet. According to this theory, the lithosphere is divided into several large plates that move and interact with one another over time.

The driving force behind plate movement is the convection currents in the mantle layer beneath the lithosphere. As these currents move, they drag the plates along with them, causing them to collide, slide past one another, or move apart. These interactions can cause geological events such as earthquakes, volcanic eruptions, and the formation of new landmasses.

The plate tectonics theory has provided a framework for understanding many of the geological features of the Earth's surface, including the distribution of mountain ranges, the formation of ocean basins, and the occurrence of earthquakes and volcanic activity. The theory has also helped explain the distribution of plant and animal species, as well as the historical movements of the continents over geological time.

To know more about layers of earth visit :-https://brainly.com/question/10430823

#SPJ1

Answer: a. seafloor

Explanation:

Answer:

120.2 g of aluminum sulfate will be produced

Explanation:

The balanced chemical equation for the reaction between aluminum hydroxide and sulfuric acid is:

2Al(OH)3 + 3H2SO4 → Al2(SO4)3 + 6H2O

According to the equation, it takes 2 moles of aluminum hydroxide to react with 3 moles of sulfuric acid to produce 1 mole of aluminum sulfate.

To find out how many grams of aluminum sulfate will be produced, we first need to calculate the number of moles of each reactant.

The molar mass of aluminum hydroxide (Al(OH)3) is:

Al = 26.98 g/mol

O = 15.99 g/mol (3 atoms)

H = 1.01 g/mol (9 atoms)

Total = 78.00 g/mol

Therefore, 54.9 g of aluminum hydroxide is equal to 54.9 g / 78.00 g/mol = 0.7038 moles of aluminum hydroxide.

The molar mass of sulfuric acid (H2SO4) is:

H = 1.01 g/mol (2 atoms)

S = 32.07 g/mol

O = 15.99 g/mol (4 atoms)

Total = 98.08 g/mol

Therefore, 91.9 g of sulfuric acid is equal to 91.9 g / 98.08 g/mol = 0.9361 moles of sulfuric acid.

Since 2 moles of aluminum hydroxide react with 3 moles of sulfuric acid to produce 1 mole of aluminum sulfate, the limiting reactant in this case is aluminum hydroxide, as it is present in the smaller amount.

The number of moles of aluminum sulfate produced can be calculated as:

0.7038 moles Al(OH)3 × (1 mole Al2(SO4)3 / 2 moles Al(OH)3) = 0.3519 moles Al2(SO4)3

The molar mass of aluminum sulfate (Al2(SO4)3) is:

Al = 26.98 g/mol (2 atoms)

S = 32.07 g/mol (3 atoms)

O = 15.99 g/mol (12 atoms)

Total = 342.15 g/mol

Therefore, the mass of aluminum sulfate produced is:

0.3519 moles Al2(SO4)3 × 342.15 g/mol = 120.2 g

Therefore, 120.2 g of aluminum sulfate will be produced.

The total number of moles of ammonia produced when 10 moles of hydrogen reacts with a mole of nitrogen would be = 6.7 moles of ammonia.

From the balanced chemical equation given above, 1 mole of nitrogen reacts with 3 moles of hydrogen to produce 2 moles of ammonia.

This means that;

3 moles of Hydrogen = 2 moles of ammonia

10 moles of hydrogen = X moles of ammonia

Make X the subject of formula;

X = 10×2/3

= 20/3

= 6.7 moles of ammonia.

Therefore when 10 mole of hydrogen reacts with nitrogen, 6.7 mole of ammonia will be produced.

Learn more about chemical equations here:

https://brainly.com/question/26694427

#SPJ1

Answer:

the ribosome will read the mRNA sequence differently

Explanation:

The change can cause the amino acid to be produced

KCN is potassium cyanide, and NaBrO2 is sodium bromide, strontium hydroxide (SrOH), iron carbonate (Fe2CO3)3, and chromium nitrate (CrNO3)3.

Ammonium NH4+ and sulfate SO42- are the two polyatomic ions that make up the ionic compound Ammonium Sulfate. To balance the sulfate ions, Ammonium Sulfate (NH4)2SO4 is produced by removing one electron from ammonium. Two NH4+ particles and one SO4 2-particle is found in every atom of ammonium sulfate.

Monosodium phosphate, monosodium dihydrogen orthophosphate, and monosodium phosphate are the three types of sodium phosphate. Formula Linear: NaH2PO4.

To know more about KCN visit :-

https://brainly.com/question/9674829

#SPJ1

Answer:

It does not have an overall charge, and is a neutral molecule. For free elements, the oxidation number is zero. Hence, the oxidation number of hydrogen in ${H_2}$ is zero as well. Some examples of free elements having zero oxidation state are: $Na,\,Fe,\,{O_2},\,{S_8}$ et cetera.

Explanation:

A. Cr2O3 (Chromium (III) Oxide); Stock Name: Chromic Oxide b. (NH4)3PO4 (Ammonium Phosphate); Stock Name: Ammonium Phosphate c. CaSO4 (Calcium Sulfate); Stock Name: Gypsum.

Gypsum is a soft, white, mineral composed of calcium sulfate dehydrate. It is typically found in the form of sedimentary rock and is an important component of soil. Gypsum can be used in a variety of industrial and commercial applications. It is often used in the production of plaster and drywall, as well as in cement and concrete.

II. a. Iron(II) Chloride

b. Barium Hydroxide

c. Lithium Cyanide

d. Lead(II) Chloride

The correct pairing is d. P4Q10: tetraphosphorus decoxide. Phosphorus can form up to four single bonds with oxygen, so the correct compound name would be tetraphosphorus decoxide.

IV.a. C2H2

b. C2H4

To learn more about Gypsum

https://brainly.com/question/14456033

#SPJ1

1. The reaction between the reactants potassium iodide and lead nitrate, which results in potassium nitrate and lead iodide. It is hence a double decomposition reaction.

2. The reaction between magnesium (Mg) and titanium tetrachloride (TiCl4) produces titanium (Ti) and magnesium chloride (MgCl2). It is a displacement reaction because titanium in titanium chloride is displaced by the more active magnesium.

3. The reaction between CO2 and H2O is an illustration of an addition reaction, or more specifically, a nucleophilic addition reaction. Thus, the hydrogen ion from the water molecule serves as the nucleophile.

4. The production of salt, which is copper chloride and water, as a result of the reaction between copper oxide and hydrochloric acid is an example of neutralization.

HCl and Copper Oxide together produce a Neutralization reaction.

5. A decomposition reaction takes place when a single reactant splits into two or more products. The all-inclusive formula AB A + B can be used to represent this. Hydrogen peroxide and water being broken down into hydrogen and oxygen are two examples of decomposition reactions.

For more information on chemical reactions kindly visit to

https://brainly.com/question/21208185

#SPJ1

In the synthesis of nucleotides, the nitrogenous bases of purines and pyrimidines are synthesized separately and then attached to the sugar-phosphate backbone of the nucleotide.

What is synthesis ?

Synthesis refers to the process of combining simpler components or building blocks to create a more complex substance or system. In other words, it is the creation of something new from individual parts or elements. Synthesis can occur at various levels, from the molecular level to the level of complex systems or structures.

Purines and pyrimidines, which are nitrogenous bases, are produced separately and subsequently joined to the sugar-phosphate backbone of the nucleotide during the synthesis of nucleotides. These nitrogenous bases will synthesise with the marker nitrogen from aspartate already present.

The nitrogen atoms in the ring structure of purines are derived from both glutamine and aspartate. Inosine monophosphate (IMP), a precursor for the production of AMP and GMP, is formed as the first step in the synthesis of purine nucleotides. A simplified diagram of the production of purine nucleotides is shown below, with the nitrogen atoms from aspartate and glutamine indicated:

In the case of pyrimidines, the nitrogen atoms in the ring structure come from aspartate and glutamine. The synthesis of pyrimidine nucleotides starts with the formation of uridine monophosphate (UMP), which serves as a precursor for the synthesis of the other pyrimidine nucleotides. The following is a simplified scheme of the synthesis of pyrimidine nucleotides, indicating the nitrogen atoms that come from aspartate and glutamine:

Therefore, the nitrogen atoms in the purine and pyrimidine bases that include the marker nitrogen from aspartate will be as follows:

Learn more about synthesis of nucleotides click here:

https://brainly.com/question/30565257

#SPJ1

The answer is  21.5 L ,So, start with the balanced chemical equation for the decomposition of hydrochloric acid.

An liquid solution of hydrogen chloride is what is known as hydrochloric acid, also referred to as muriatic acid. It has an unmistakably strong odour and is translucent. It is categorised as a powerful acid. In the digestive processes of the majority of mammal species, including humans, it is a part of the gastric acid. A crucial commercial substance and reagent for laboratories is hydrochloric acid.

Chemical burns from hydrochloric acid can be extremely painful if they come into touch with skin or other organs. Ingestion of hydrochloric acid can result in blindness. The concentration of the acid and how long it remains in touch with the organs determine how severe the burns are.

Learn more about hydrochloric

https://brainly.com/question/14006357

#SPJ1

3.49 grams of NaOH reacted in this precipitation reaction.

From the balanced chemical equation

1 mole of Fe(NO3)3 reacts with 3 moles of NaOH to produce 1 mole of Fe(OH)3 and 3 moles of NaNO3.

We can start by calculating the number of moles of Fe(OH)3 produced:

molar mass of Fe(OH)3

= 55.85 g/mol + 3(16.00 g/mol + 1.01 g/mol)

= 106.88 g/mol

moles of Fe(OH)3 = 28.0 g / 106.88 g/mol = 0.262 moles

According to the stoichiometry of the balanced equation,

1 mole of Fe(OH)3 is produced by reacting with 3 moles of NaOH. Therefore, the number of moles of NaOH used in the reaction is:

moles of NaOH = 0.262 moles / 3 = 0.0873 moles

Convert the number of moles to grams:

molar mass of NaOH

= 22.99 g/mol + 16.00 g/mol + 1.01 g/mol

= 40.00 g/mol

grams of NaOH

= moles of NaOH x molar mass of NaOH

= 0.0873 moles x 40.00 g/mol

= 3.49 g

Learn more about precipitation reaction at:

https://brainly.com/question/20469884

#SPJ1

There are 2.586 moles of phosphorus in 80.0 g of phosphorus.

This number is known as Avogadro's number, which is approximately 6.022 x 10^23.

What is Moles?

Moles are a unit of measurement used in chemistry to express the amount of a substance. One mole of a substance is the volume of that substance that has the same number of atoms as there are in 12 grammes of pure carbon-12. Other terms for moles include molecules and ions.This number is known as Avogadro's number, which is approximately 6.022 x 10^23.

To calculate the number of moles in 80.0 g of phosphorus, we need to divide the mass of phosphorus by its molar mass. The molar mass of phosphorus is 30.97 g/mol.

Number of moles of phosphorus = 80.0 g / 30.97 g/mol

Number of moles of phosphorus = 2.586 moles

Therefore, there are 2.586 moles of phosphorus in 80.0 g of phosphorus.

Learn more about Moles from given link

brainly.com/question/29367909

#SPJ1

The energy in nuclear fuel comes from the fission (splitting) or fusion (merging) of atomic nuclei. When the nucleus of an atom is split or merged, a large amount of energy is released in the form of heat and radiation. This energy is known as nuclear energy, and it is one of the most concentrated forms of energy known to us.

To convert nuclear energy into electrical energy, we typically use a nuclear reactor, which is a device that uses controlled nuclear reactions to generate heat. The heat is then used to produce steam, which drives a turbine connected to a generator. The generator converts the mechanical energy of the turbine into electrical energy, which can be distributed to homes and businesses through a power grid.

In more detail, the nuclear reactor contains fuel rods that are made of a radioactive material, such as uranium-235 or plutonium-239. When a neutron strikes the nucleus of one of these atoms, it causes the nucleus to split into two smaller nuclei, along with the release of additional neutrons and a large amount of heat. This process is known as nuclear fission, and it is sustained in the reactor by controlling the rate of neutron production and absorption.

The heat produced by nuclear fission is transferred to a coolant, such as water or gas, which carries the heat to a heat exchanger. In the heat ex