How many joules of heat are needed to raise the temperature of 100 g of iron from 23°C to 33°C, if the specific heat of iron is 0. 45 J/g°C

The no. of moles of \(CH_4\) remaining after the reaction is found to be 11.5 moles.

The no. of moles of a material equals the ratio of its given mass to the mass of one mole of that molecule in a chemical reaction.

The coefficients reflect the number of moles, not simply molecules, that react.

Stoichiometric coefficients are the numbers that come before the chemical formula of a molecule participating in a reaction. They assist us in determining the relative amounts or no. of moles of each reactant consumed and product created during a reaction.

\(CH_4 (g) + 2O_2 (g) \rightarrow CO_2 (g) + 2H_2O (g)\)

No. of moles of \(CH_4\) = 13.0 mol

No. of moles of \(O_2\) = 3.0 mol

Here \(O_2\) is limiting reagent because moles of \(O_2\) is less.

Thus, \(CH_4\) is in excess

1 mol \(CH_4\) = 2 mol \(O_2\)

x mol \(CH_4\) = 3 mol \(O_2\)

Moles of \(CH_4\) used = 3 x 1 / 2 = 1.5 mol

Here we have 13 moles of \(CH_4\),

Therefore,

No. of moles of \(CH_4\) left = 13 - 1.5 = 11.5

Result:

11.5 moles of \(CH_4\) will remain after the reaction.

Learn more about No. of moles used in a reaction here:

https://brainly.com/question/15364329

#SPJ4

Answer: a mixture

Explanation:

5 moles of water is the correct answer

What is mole ?

A mole is a unit of measurement used in chemistry to quantify the amount of a substance. It is defined as the amount of a substance that contains Avogadro's number of entities, which is approximately 6.022 x 10^23 particles. The mole is used to express the amount of a substance in terms of its molecular or atomic count. The mole is particularly useful in chemical reactions, where it is used to balance the number of atoms or molecules of the reactants and products. For example, in a balanced chemical equation, the number of moles of each reactant must be equal to the number of moles of the corresponding product.

To know more about mole , click the given link below ;

https://brainly.com/question/15356425

#SPJ1

Answer:

Explanation:

Here, we want to get the effect of the change on the force

When one of the masses is multiplied by 2, it means the entire force will be multiplied by 2

In a case where the distance is halved, the force is decreased by a factor of 1/4

Answer:

Saturn is the sixth planet from the Sun and the second-largest in the Solar System, after Jupiter. It is a gas giant with an average radius of about nine times that of Earth. It only has one-eighth the average density of Earth; however, with its larger volume, Saturn is over 95 times more massive.

hope this helps

have a good day :)

Explanation:

Sodium chloride is an ionic compound. The chemical name of Sodium chloride is NaCl.

Ionic compounds are made up of ions. They have charged particles. Ionic compounds when dissolved in solvents they form ions. Sodium chloride losses Na + and cl ions. Magnesium oxide will form mg2+ and O2 ions.

Ionic compounds dissolve in polar solvents. Examples are water, methanol and formamide. For ionic compounds to dissolve there will be ionic compounds will form.

Ionic bonds are not directional. There would be electrostatic or columbic attraction will be form in molecules.  The bonding seen in ionic compounds is called ionic bonding. There are two types of ions seen in molecules such as positive ions and negative ions.

Therefore, Sodium chloride is an ionic compound. The chemical name of Sodium chloride is NaCl.

To learn more about ionic bonding, refer to the link:

https://brainly.com/question/11527546

#SPJ4

Answer: B

Explanation: JUST TOOK THE QUIZ

The natural processes injecting particulate matter into the atmosphere are Volcanic Eruption, Dust Storms, Forest Fires, Sea Spray, Biomass Burning, and Biogenic Emissions

There are several natural processes that can inject particulate matter into the atmosphere, including:

Here you can learn more about the atmosphere

brainly.com/question/28504747

#SPJ4

It is expected that mercury would have a molten interior based on its small size, rapid rotation, and density. Mercury is one of the four inner planets in our solar system.

It is the smallest planet in our solar system and the one closest to the Sun. Mercury's diameter is just 40% of the Earth's diameter, making it the smallest planet in our solar system. It has a rocky surface that is heavily cratered and has numerous cliffs. Additionally, Mercury has a molten core that accounts for roughly 85 percent of its volume.Mercury's rapid rotation and density suggest that it has a molten interior. Mercury rotates three times on its axis for every two times it orbits the Sun.

This leads to a considerable amount of friction that warms the interior of the planet. Mercury's density is also quite high, indicating that the planet's interior is made up of metals such as iron, nickel, and sulfur, which have relatively high melting points. As a result, the planet's core is assumed to be molten.The above mentioned facts lead to the conclusion that Mercury would have a molten interior.

learn more about inner planets

https://brainly.com/question/11023671

#SPJ11

Some emerging infections have increased in occurrence within the past two decades" is true.

Emerging infections are infectious diseases that are either newly discovered or previously undiscovered and are either expanding in frequency, geographic scope, or virulence .

There is evidence to show that over the past 20 years, the prevalence of several emerging infections has grown. These include ailments like SARS, Ebola, Zika, and COVID-19 as examples. The causes of this rise are complicated and multifaceted, but they may be linked to things like globalization, increased trade and travel, deforestation and alterations in the climate and land usage

Learn more about emerging infections here : brainly.com/question/27907953

#SPJ1

If 37.5 ml of 0.100 m NaOH is added to 10.0 ml of 0.100 m, \(CH_3COOH\), the pH of the resulting solution after mixing 37.5 mL of 0.100 M NaOH with 10.0 mL of 0.100 M  \(CH_3COOH\) is approximately 12.76.

We must evaluate the reaction that occurs between NaOH and  \(CH_3COOH\) to get the pH of the resultant solution. The interaction of  \(CH_3COOH\) and OH- produces CH3COO-, a weak basic, and water (H2O).

Moles of \(CH_3COOH\) = volume (in L) × concentration

Moles of  \(CH_3COOH\)  = 0.100 × 10.0

Moles of  \(CH_3COOH\)  = 1.0 mol

Moles of NaOH = volume (in L) × concentration

Moles of NaOH = 0.100 × 37.5 mol/L

Moles of NaOH = 3.75 mols

Now,

\(\rm NaOH_{self}=\frac{0.100\times37.5-0.100\times10.0}{37.5+10}\)

= 0.579M

So,

OH⁻ = NaOH = 0.579M

pOH = -log[\(OH^-\)]

pOH = -log[0.579M]

pOH ≈ 1.24

pH = 14 - pOH

pH = 14 - 1.24

pH ≈ 12.76

Therefore, the pH of the resulting solution after adding 37.5 mL of 0.100 M NaOH to 10.0 mL of 0.100 M \(CH_3COOH\) is approximately 12.76.

For more details regarding pH, visit:

https://brainly.com/question/2288405

#SPJ12

The change in heat content of the system is approximately 516,883.58 J (or 516.88 kJ).

To calculate the change in heat content of the system, we need to consider the heat gained or lost during each phase change.

First, we need to calculate the heat gained or lost during the cooling of steam to water at 100°C (the boiling point of water at atmospheric pressure).

1.Heat lost during cooling from 121°C to 100°C:

The specific heat capacity of steam is approximately 2.03 J/g°C.

The mass of the sample is 218 g.

The temperature change is 121°C - 100°C = 21°C.

The heat lost during this phase is given by:

Q1 = (mass) × (specific heat capacity) × (temperature change)

Q1 = 218 g × 2.03 J/g°C × 21°C = 9186.06 J

Next, we need to calculate the heat lost during the phase change from steam at 100°C to water at 0°C.

2. Heat lost during phase change from steam to water:

The heat of vaporization for water at its boiling point is approximately 40.7 kJ/mol. Since we have the mass of the sample, we can convert it to moles of water.

The molar mass of water (H2O) is approximately 18 g/mol.

Moles of water = (mass of sample) / (molar mass of water)

Moles of water = 218 g / 18 g/mol ≈ 12.11 mol

The heat lost during this phase change is given by:

Q2 = (moles of water) × (heat of vaporization)

Q2 = 12.11 mol × 40.7 kJ/mol × 1000 J/kJ = 494,467 J

Finally, we need to calculate the heat lost during the cooling of water from 0°C to -14°C.

3. Heat lost during cooling from 0°C to -14°C:

The specific heat capacity of water is approximately 4.18 J/g°C.

The mass of the sample is 218 g.

The temperature change is 0°C - (-14°C) = 14°C.

The heat lost during this phase is given by:

Q3 = (mass) × (specific heat capacity) × (temperature change)

Q3 = 218 g × 4.18 J/g°C × 14°C = 12,230.52 J

To find the total change in heat content, we sum up the heat changes from each phase:

Total change in heat content = Q1 + Q2 + Q3

Total change in heat content = 9186.06 J + 494467 J + 12230.52 J

Total change in heat content ≈ 516,883.58 J

Therefore, the change in heat content of the system is approximately 516,883.58 J (or 516.88 kJ).

Learn more about Heat.

brainly.com/question/13860901

#SPJ11

The characteristics and the type of molecular bond they describe:

1. Bonds found in Halite (between Na⁺ and Cl⁻): Ionic bond

2. Bonds found between Si and O in the Si-O tetrahedron: Covalent bond

3. Bonds inside the water molecule (between the H and O): Covalent bond

4. Bonds that exist between two water molecules: Hydrogen bond

5. Strongest bond type: Covalent bond

6. Weakest bond type: Van der Waals bond

7. Bonds that are used by water to dissolve salt: Ionic bond

The ionic bond is a type of molecular bond found in halite (between Na⁺ and Cl⁻). The Si-O tetrahedron is held together by a covalent bond. The bond inside the water molecule (between the H and O) is also a covalent bond. The hydrogen bond is the type of bond that exists between two water molecules. The covalent bond is the strongest bond type, while the van der Waals bond is the weakest bond type. Water uses the ionic bond to dissolve the salt.

Learn more about bonds: https://brainly.com/question/32306693

#SPJ11

\({ \red{ \underline{ \tt{Langmuir \: adsorption \: isotherm:}}}}\)

The defect of Freundlich adsorption isotherm is that it fails at high pressure of the gas.

Langmuir derived the adsorption isotherm based on the theoretical considerations. It is generally applied to chemical adsorption.

It can be expressed as

\({ \blue{ \bold{ \frac{X}{m} = \frac{AP}{1+BP}}}}\)

where,

X = mass of the gas adsorbed

M = mass of the adsorbent

P = equilibrium pressure

Answer:

V₂ = 13.44 L

Explanation:

Given that,

Initial volume, V₁ = 5 L

Initial pressure, P₁ = 0.863 atm

Final pressure, P₂ = 0.321 atm

We need to find the final volume of the balloon. The relation between the volume and pressure is given by :

\(P_1V_1=P_2V_2\)

Where

V₂ is the volume of the balloon

So,

\(V_2=\dfrac{P_1V_1}{P_2}\\\\V_2=\dfrac{0.863 \times 5}{0.321 }\\\\V_2=13.44\ L\)

So, the final volume of the balloon is equal to 13.44 L.

If you shake ethanol and oil in a test tube and then add water, you would likely see the water and ethanol mix together, while the oil remains separate.

This is because ethanol and water are miscible, meaning that they can mix together in any proportion to form a homogenous solution. Oil, on the other hand, is immiscible with water, meaning that it does not dissolve in water and will instead form a separate layer on top of the water.

When ethanol and water are mixed together, the ethanol molecules become surrounded by water molecules, and the mixture becomes homogenous.

This is because the ethanol molecules are polar, meaning that they have a positive end and a negative end, and the water molecules are also polar, with a positive end and a negative end. The positive end of the ethanol molecule is attracted to the negative end of the water molecule and vice versa, so the two substances can mix together easily.

Oil, on the other hand, is nonpolar, meaning that it does not have positive and negative ends. As a result, it does not interact with water molecule

Learn more about  ethanol from

https://brainly.com/question/20814130

#SPJ1

Answer:

organic chemistry

Explanation:

There are many branches of chemistry. Some of them are physical chemistry, analytical chemistry, inorganic chemistry and organic chemistry.

A chemist is testing the quality of a wine produced by a vineyard. It means he will test the structure, properties, and preparation of wine. All these tests comes under organic chemistry.

Hence, the correct option is (d) "organic chemistry"

Answer:

analytical chemistry

Explanation:

I took the test

Among the molecules mentioned, N₂H₄ (hydrazine) will have the shortest nitrogen-nitrogen bond.

The nitrogen-nitrogen bond length in a molecule is influenced by several factors, including bond order, lone pair repulsion, and steric hindrance.

In the case of N₂, it exists as a stable, diatomic molecule with a triple bond. The triple bond consists of one sigma bond and two pi bonds, resulting in a strong bond between the nitrogen atoms. Therefore, N₂ has a relatively short nitrogen-nitrogen bond length compared to the other molecules.

Moving on to N₂H₂ (diazenylene), it contains a double bond between the two nitrogen atoms. The double bond consists of one sigma bond and one pi bond. The presence of the pi bond makes the bond weaker than the triple bond in N₂, leading to a longer nitrogen-nitrogen bond length compared to N₂.

Finally, N₂H₄ (hydrazine) has a single bond between the nitrogen atoms. The presence of two lone pairs of electrons on each nitrogen atom creates significant lone pair repulsion. This repulsion pushes the nitrogen atoms closer together, resulting in a shorter nitrogen-nitrogen bond length compared to N₂ and N₂H₂.

Additionally, steric hindrance can also affect the bond length. In the case of hydrazine, the presence of bulky hydrogen atoms adjacent to the nitrogen atoms creates steric hindrance, further shortening the nitrogen-nitrogen bond length.

In summary, among the molecules mentioned, N₂H₄ (hydrazine) will have the shortest nitrogen-nitrogen bond due to the presence of lone pair repulsion and steric hindrance, despite having a single bond between the nitrogen atoms.

To know more about bond length, refer to the link below:

https://brainly.com/question/29262783#

#SPJ11

Answer:

Microwave Ovens run on AC Input from the power supply.

Answer:

Its an AC

Explanation:

microwave ovens run on AC Input from the power supply.

Answer:

1.733 x 10⁻⁴ mole CO₂(g)

Explanation:

Assuming the rxn given is at STP conditions ...

                        C₃H₈             +       5O₂      =>             3CO₂    +    4H₂O

Given:             Excess             =  0.647ml                ?(moles)           -----  

                                          = 0.000647Liters

                                      = 6.47 X 10⁻⁴L/22.4L·mol⁻¹

                                        = 1.733 x 10⁻⁵ mol O₂

moles CO₂ = 3/5(2.89 x 10⁻⁴)mole CO₂ = 1.733 x 10⁻⁵ mole CO₂

Answer:

Cutting the supply of oxygen

Explanation:

We know that a thing need three things to burn

Co_2 stops oxygen supply so fire gets extinguished

The SI units to measure the mass of a boulder is a ton. The correct option is A.

The SI unit is the international system of unit. They are made to  accepted in the world. To avoid confusion is the measurement units of different measurement.  

Thus, the correct option is A, ton.

Learn more about SI unit

https://brainly.com/question/12750330

#SPJ1

Answer:

liquid ethanol can be separated from a mixture of ethanol and water by fractional distillation. This method works because the liquids in the mixture have different boiling points. When the mixture is heated, one liquid evaporates before the other.

Explanation:

hope this helps :3

Neutral lithium is oxidized and changed into Li+ at the anode. When the electrons from the anode reaction are received at the cathode, this causes the reduction of Co(IV) to Co(III).

The biological aerobic system (BOD) of wastewater is decreased after oxidation, which also lessens some contaminants' cytotoxicity. Some contaminants undergo this treatment and are transformed into dioxide, water, and sludges. Disinfection is commonly accomplished using chemical oxidation.

The reaction brought on by coming into touch with oxygen molecules is known as oxidation. These materials can be non-metals like live tissues or metals. Technically speaking, oxidation is the removal of one electrons during the phase of interaction between two or more atoms.

To know more about Oxidation visit:

https://brainly.com/question/16976470

#SPJ13

Answer:

Knowing your lab equipment and their names will aid in having a successful experiment and may help in correcting errors.

If you do not know your lab equipment, that will only result in having a lack of knowledge of the equipment or not knowing how to correct a mistake in an experiment.

Explanation:

Hope I helped.

Because boiling point is independent of liquid volume, the boiling point would not vary.

What is boiling point  ?

A liquid's boiling point changes depending on the pressure being applied; the normal boiling point is the temperature at which the vapor pressure is equal to the average atmospheric pressure at sea level (760 mm [29.92 inches] of mercury). Water boils at sea level at 100° C.

The temperature at which a liquid's vapor pressure equals the pressure around it and the liquid turns into a vapor is known as the boiling point of a substance

A liquid's boiling point varies depending on the atmospheric pressure in the area. The boiling point of a liquid is lower in a partial vacuum than it is at atmospheric pressure. A liquid's boiling point is lower under low pressure than it is under air pressure. As a result, water boils at 99.97 °C (211.95 °F) at sea level but at 93.4 °C (200.1 °F) at 1,905 m (6,250 ft) altitude under standard pressure. Various liquids will boil at different temperatures at a given pressure.

Because boiling point is independent of liquid volume, the boiling point would not vary.

To know about boiling point from the link

https://brainly.com/question/40140

#SPJ4

The number of quarts of 5% solution that can be made from 4.73 grams of the drug is 100 quarts.

To calculate the number of quarts of 5% solution that can be made from 4.73 grams of the drug, we need to use the formula that relates the amount of drug to the concentration and volume of the solution. Let's first convert the drug quantity to grams. Since 1 gram is equivalent to 1000 milligrams, then:

4.73 grams = 4730 milligrams

Now, let's plug in the values into the formula and solve for the volume of the solution.

Amount of drug (in grams) = Concentration (as a decimal) × Volume of solution (in milliliters)

To convert milliliters to quarts, we will divide the volume by 946.35 (1 quart = 946.35 milliliters). So we have:

4730 mg = 0.05 × Volume of solution (in milliliters)

Volume of solution = 4730 ÷ 0.05 = 94,600 milliliters (ml)

Number of quarts of solution = 946.35 = 100 quarts (rounded to the nearest whole number).

Therefore, 100 quarts of 5% solution can be made from 4.73 grams of the drug.

Learn more about quarts: https://brainly.com/question/4418837

#SPJ11