What volume would be occupied by 100. g of O, gas at a pressure of 1.50 atm and a temperature of 25°C?​

The average atomic mass of the Mc in the sample, given the that the hypothetical mass spectrum of Mc, is 289.1 amu

First, we shall determine the atomic mass of each isotope as shown from the spectrum. Details below:

For 1st isotope

Atomic mass of 1st isotope = (Number of atom /total atom) × atomic mass

Atomic mass of 1st isotope = (3 / 10) × 288.2

Atomic mass of 1st isotope = 86.46 amu

For 2nd isotope

Atomic mass of 2nd isotope = (Number of atom /total atom) × atomic mass

Atomic mass of 2nd isotope = (5 / 10) × 289.2

Atomic mass of 2nd isotope = 144.6 amu

For 3rd isotope

Atomic mass of 3rd isotope = (Number of atom /total atom) × atomic mass

Atomic mass of 3rd isotope = (2 / 10) × 290.2

Atomic mass of 3rd isotope = 58.04 amu

Finally, we shall determine the average atomic mass of Mc. Details below:

Average atomic mass of Mc = sum atomic masses of isotopes

Average atomic mass of Mc = 86.46 + 144.6 + 58.04

Average atomic mass of Mc = 289.1 amu

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Answer

-52.2 Joules

Explanation

Given that;

Mass of krypton, m = 12.3 g

Temperature change, ΔT = 22.2°C - 39.3°C = -17.1°C

The specific heat of gaseous krypton, c = 0.248 J/g°C.

What to find:

The energy change, Q.

Step-by-step solution:

The energy change, Q can be determined using:

Q = mcΔT

Putting the values of the given parameters into the formula, this yields:

Therefore the energy change = -52.2 Joules

Answer:

An enzyme called amylase breaks down starches (complex carbohydrates) into sugars, which your body can more easily absorb. Other words saliva contains special enzymes that help digest the starches in your food.

The relative atomic mass of the metal, M is 65 g/mol.

The mole ratio of the metal and the sulfate is calculated from the mass of the metal and the sulfate present in the compound.

Mass of the compound = 1.61 g

Mass of the metal, M, in the compound = 0.65 g

Mass of sulfate = mass of compound - the mass of metal

Mass of sulfate = 1.61 - 0.65

Mass of sulfate = 0.96 g

The formula of the compound is MSO₄

1 mole of the metal combines with 1 mole of sulfate

Moles of sulfate in the compound = mass / molar mass

Molar mass of sulfate = 96 g/mol

Moles of sulfate = 0.96 / 96

Moles of sulfate = 0.01 moles

Hence, the moles of metal in the compound is 0.01 moles

The relative atomic mass of the metal = 0.65 / 0.01

The relative atomic mass of the metal  = 65 g/mol

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Complete question:

Calculate the relative atomic mass of a metal M given that 0.65g of the metal forms 1.61g of sulfate of formula MSO₄. (S = 32, O = 16).

The VBT provides a useful framework for understanding the nature of chemical bonding in molecules and helps us to predict the shapes and properties of molecules.

Valence Bond Theory (VBT) is a model that describes the chemical bonding in molecules in terms of the overlap of atomic orbitals. According to VBT, the bond in HCl results from the overlap of the half-filled 1s orbital of the hydrogen atom and the half-filled 3p orbital of the chlorine atom.

In HCl, the hydrogen atom has one electron in its 1s orbital, while the chlorine atom has three half-filled p orbitals (3px, 3py, 3pz) and one unpaired electron in each of them. The unpaired electrons in the 3p orbital of chlorine and the 1s orbital of hydrogen overlap to form a covalent bond. This bond arises due to the attraction between the positively charged hydrogen nucleus and the negatively charged chlorine nucleus.

The overlapping orbitals give rise to a bond that is stronger than the individual atomic orbitals. The VBT model also explains the concept of hybridization in which atomic orbitals are combined to form hybrid orbitals, resulting in the formation of stronger covalent bonds.

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"Action Potential" is the name for the electrochemical signal that allows neurons to communicate with neighboring cells.

Electrochemical signals are those that are sent by neurons. An electric potential which goes along length of the cell is produced by a neuron after it has been triggered by a stimulus of some kind. The "electro" component of electrochemical is this.

A neuron's membrane conducts an electrical charge known as an action potential, commonly known as a nerve impulse. It can be produced when chemical inputs from a neighbouring cell alter a neuron's membrane potential.

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The increase in the diversity of species in an ecosystem  definitely lead to an increase in the productivity from that ecosystem. Hence, the statement is true.

An ecosystem is the regions in earth where  a group of living things and their essential non living things reside. There are various kind of ecosystems such as aquatic systems, forests, deserts etc.

The biodiversity refers to the diverse species of plants , animals and all other kind of livings there. By raising the possibility that species would use complementary resources and by increasing the likelihood that a highly productive or efficient species is present in the population, increasing species diversity can impact ecosystem functions, such as production.

For instance, greater use of soil resources can boost ecosystem production when there is a large diversity of plants. Similarly, when diverse plants populate more dependent animal variants survives more.

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Answer:

A. True

Explanation:

Got it right on Edge 2023.

Explanation:

Percentage composition of oxygen = (80/134) * 100% = 59.7%.

Answer:

207g

Explanation:

Given compound:

            Ca(ClO₃)₂

The equivalent mass can be derived by summing the molar masses of each atom

  Molar mass of Ca = 40

                            Cl  = 35.5

                            O  = 16

Now solve;

 Molar mass  = 40 + 2(35.5 + 3(16)) = 207g

Answer:

154.9475 grams

Explanation:

61.979g/mol is molar mass of Na2O

61.979g/mol times .250 M times 10L = 154.9475 grams

If 4.00 mL of vinegar needs 43.5 mL of 0.150 m NaOH  to reach the equivalence point in a titration, The grams of the acetic acid is 119.9 g.

Given that :

The molarity of NaOH = 0.150 M

The volume of NaOH = 43.5 mL = 0.0435 L

The moles = molarity × volume

                 = 0.150 × 0.0435

                 = 0.0065 mol

At equivalence point ,

Moles of CH₃COOH = moles of NaOH

The molarity of the CH₃COOH = moles / volume

                                                   = 0.0065 / 0.004

                                                   = 1.625 mol

Volume of  CH₃COOH = 1.50 × 0.946353

                                     = 1.230 L

The mass of the Acetic acid = 1.625 × 1.230 × 60

                                               = 119.9 g

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The chromium ion has been oxidized, meaning it has lost electrons while the dichromate ion has been reduced, meaning it has gained electrons.

The oxidation of the chromium ion (Cr) to dichromate ion (Cr2O7^-2) in basic aqueous solution is given as follows:

Cr → Cr2O7^-2

Since we are in a basic solution, we need to balance the charge of the reaction by adding OH^- ions to both sides of the reaction. The number of OH^- ions added should be equal to the number of H^+ ions that would be produced by the oxidation reaction.

The equation becomes:

Cr → Cr2O7^-2 + 14OH^- + 6e^-

The oxidation half-reaction of Cr is therefore:

Cr → Cr2O7^-2 + 14OH^- + 6e^-

You can write the state of the different compounds to get the complete balanced half-reaction as follows:

Cr(s) → Cr2O7^-2(aq) + 14OH^-(aq) + 6e^-(aq)

You should note that the chromium ion has been oxidized, meaning it has lost electrons while the dichromate ion has been reduced, meaning it has gained electrons.

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The compound formed when magnesium oxide reacts with water is magnesium hydroxide (Mg(OH)₂).

Magnesium oxide (MgO) is an ionic compound consisting of magnesium cations (Mg²⁺) and oxide anions (O²⁻). When it reacts with water (H₂O), the oxygen atom in water attracts the magnesium cation, leading to the formation of magnesium hydroxide.

The reaction can be represented as follows:

MgO + H₂O → Mg(OH)₂

In the resulting compound, magnesium hydroxide, there are two hydroxide ions (OH-) for every magnesium ion (Mg²⁺). The chemical formula Mg(OH)₂ represents this ratio.

Magnesium hydroxide is an alkaline compound and is commonly used as an antacid to treat heartburn and indigestion. It is also used in various industrial applications.

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Answer:

A covalent bond is a chemical bond that involves the sharing of electron pairs between atoms. These electron pairs are known as shared pairs or bonding pairs, and the stable balance of attractive and repulsive forces between atoms, when they share electrons, is known as covalent bonding.

Explanation:

hope it helps, please mark as brainliest

Answer:

answer of your question is 4th

Explanation:

P205

Explanation:

there is what i got hope it helps. ❤❤❤❤❤

Answer: 4896

Explanation:

Answer:4,896 minutes

Explanation:

Wound healing is a chemical change.

A chemical change involves the formation of a new substance. A substance changes form from one form into another in the process. A physical change does not involve the formation of new substances. Wound healing involves a number of chemical changes.

A wound can also be referred to as a tissue damage. When a tissue is damaged, bleeding results. Bleeding could lead to so much loss of blood.

The human body has mechanisms in place to combat this excessive loss of blood. This occurs when a complex biochemical pathway leads to the formation of fibrinogen. The enzyme thrombin converts fibrinogen to fibrin. The formation of fibrin is very essential to the wound healing process.

We can see that a series of chemical changes are involved in the process of wound healing when your finger is cut.

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The concentration of \(FeSCN^{2+}}$\) at equilibrium in our solution is \(5.4 \times 10^{-5} mol/L\).

To determine the concentration of \(FeSCN^{2+}}$\) in a solution at equilibrium, we can use the Beer-Lambert law, which relates the concentration of a colored species in solution to its absorbance at a specific wavelength. The law can be written as A = εcl, where A is the absorbance, ε is the molar extinction coefficient, c is the concentration, and l is the path length of the sample.

To perform this calculation, we need to first create a standardization curve, which is a plot of the absorbance of known concentrations of \(FeSCN^{2+}}$\) at a particular wavelength. Once we have the curve, we can use the slope of the line to calculate the molar extinction coefficient of \(FeSCN^{2+}}$\).

Once we have determined the molar extinction coefficient, we can measure the absorbance of our sample at the same wavelength and use the Beer-Lambert law to calculate the concentration of \(FeSCN^{2+}}$\) in our solution at equilibrium. For example, let's say that our sample has an absorbance of 0.3 at a wavelength of 450 nm and a path length of 1 cm. If our standardization curve has a slope of \(5.6 \times 10^{3} L/mol/cm\), then we can calculate the concentration of \(FeSCN^{2+}}$\) in our sample as:

\($c = \frac{A}{\varepsilon l} = \frac{0.3}{5.6\times 10^3 \text{ L/mol/cm} \times 1 \text{ cm}} = 5.4\times 10^{-5} \text{ mol/L}$\)

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Answer:Hi! I hope this will help you with your question, whether this is an assignment or not. The answer that I get is 0.033 concentration.

If 0.0025 mol NaNo3 forms during the reaction, the concentration of NaNO3 in the final solution should be 0.033.

Explanation:

Answer:

The answer is explained below

Explanation:

Put the steps of the carbon cycle in order using Step 1 as your starting point

Step 1: Bacteria, through nitrogen fixation and nitrification, convert nitrogen into a usable form. The animal dies and decomposes, returning nitrogen back to the soil. Once nitrogen is in usable form, it is taken up by plants and assimilated into proteins.. An animal eats a plant and the nitrogen becomes part of the animal’s proteins.

The steps taking in the carbon circle using step 1 as the starting point is as follows:

Step 1:  Bacteria, through nitrogen fixation and nitrification, convert nitrogen into a usable form.

Bacteria convert nitrogen into nitrites and nitrates through the process of nitrification. Nitrites and nitrates are in the form that can be used by the plants

Step 2: Once nitrogen is in usable form, it is taken up by plants and assimilated into proteins.

The Nitrogen can only be used by the plants when in nitrites and nitrates form. When in this form, it is then assimilated into plant tissue as protein.

Step 3: An animal eats a plant and the nitrogen becomes part of the animal’s proteins.

An animal such as rabbit eats the plant and the protein in the plant becomes protein in the animal.

Step 4: The animal dies and decomposes, returning nitrogen back to the soil.

When the animal dies, the animal undergoes decomposition and the nitrogen in the animal is returned to the soil

Answer:

d.

Explanation:

Answer

C. Any substance with a pH above 7.

Explanation

Alkalis are water-soluble bases. bases that may be dissolved in water to produce OH⁻ ions are termed alkali. Alkali turns red litmus blue and is sour to taste. pH of an alkali substance is greater than 7.

Examples of alkali are NaOH, KOH, and Ca(OH)₂.

Hence, the answer which best describes an alkali is option C. Any substance with a pH above 7.

Ethane is the limiting reactant, so no mass of ethane will be left over by the chemical reaction. All the mass will react, the 8.1 grams of ethane.

How much grams of ethane will react, explain.

First of all, we need to determine the reaction and the limiting reactant to work with the stoichiometry.

The equation is: 2C₂H₆ + 7O₂ →  4CO₂ + 6H₂O

We define the moles of the reactants:

8.12 g / 30 g/mol = 0.270 moles of ethane

13g / 32 g/mol = 0.406 moles of oxygen

To determine the limiting reactant, we start with oxygen:

7 moles of O₂ can react with 2 moles of ethane

Then, 0.406 moles of O₂ will react with (0.406 . 2) / 7= 0.116 moles of ethane.

We do not have enough ethane, just only 0.07 moles to react.

Ethane is the limiting reactant, so no mass of ethane will be left over by the chemical reaction. All the mass will react, the 8.12grams of ethane.

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The theoretical yield of the products would be 88.0 g of \(CO_2\) and 54.0 g of \(H_2O\).

The balanced equation for the reaction of 1 mol of ethane (\(C_2H_6\)) with \(O_2\) at -135°C is:

\(C_2H_6 (g) + 3 O_2 (g) = 2 CO_2 (g) + 3 H_2O (g)\)

According to the balanced equation, 1 mole of \(C_2H_6\) reacts with 3 moles of \(O_2\) to produce 2 moles of \(CO_2\) and 3 moles of \(H_2O\).

To find the theoretical yield of the product(s), we need to know the amount of ethane that is being reacted.

Assuming that we have 1 mole of ethane (\(C_2H_6\) ), we can calculate the theoretical yield of the products as follows:

The molar mass of \(CO_2\) is:

12.0 g/mol (C) + 2(16.0 g/mol) = 44.0 g/mol

The molar mass of \(H_2O\) is:

2(1.0 g/mol) + 16.0 g/mol = 18.0 g/mol

From the balanced equation, we know that 1 mole of \(C_2H_6\) produces 2 moles of \(CO_2\) and 3 moles of \(H_2O\). Therefore, the theoretical yield of \(CO_2\) would be:

moles of \(CO_2\) = 2 x moles of \(C_2H_6\)

If we assume that we have 1 mole of \(C_2H_6\), then the theoretical yield of \(CO_2\) would be:

moles of \(CO_2\) = 2 x 1 = 2 moles

mass of \(CO_2\) = moles of \(CO_2\) x molar mass of \(CO_2\) = 2 mol x 44.0 g/mol = 88.0 g

Similarly, the theoretical yield of \(H_2O\) would be:

moles of \(H_2O\)  = 3 x moles of \(C_2H_6\)

If we assume that we have 1 mole of \(C_2H_6\), then the theoretical yield of \(H_2O\) would be:

moles of \(H_2O\) = 3 x 1 = 3 moles

mass of \(H_2O\) = moles of \(H_2O\) x molar mass of \(H_2O\) = 3 mol x 18.0 g/mol = 54.0 g

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The possible options for the proposed multiplication or division of measurements are:

1. 9.0 km * 7.0 km = 63 km²; this is a correct option because km² is dimensionally correct.

3. 24 dL²/0.60 L = 0.24 L²/0.60 L = 0.4 L is a correct option since L is a unit of volume.

The possible options among the proposed multiplication or division of measurements are those which are dimensionally correct.

Considering the given options:

1. 9.0 km * 7.0 km = 63 km²

This is a correct option because km² is dimensionally correct as it is a unit of area.

2. 2.0 g²  * 0.043 kg is not correct since there is no unit of square mass.

3. 24 dL²/0.60 L = 0.24 L²/0.60 L = 0.4 L is a correct option since L is a unit of volume.

In conclusion, the correct measurements options are those that are dimensionally correct.

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Answer:

3,6,6...................................