Which statement is completely accurate?

Responses

Atoms of the same element always have different atomic weights.

Atoms of the same element always have different atomic weights.

Atoms of the same element can have neutrons but exist without protons.

Atoms of the same element can have neutrons but exist without protons.

Atoms of the same element always have different numbers of neutrons.

Atoms of the same element always have different numbers of neutrons.

Atoms of the same element can have different numbers of neutrons.

The enthalpy of the following chemical equation is -393.5+(-296.8)+87.9=-602.4 kilojoules.

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

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The molar volume would be impacted too high. Therefore, option C is correct.

The molar volume (Vm) is the volume occupied by one mole of a chemical element or chemical compound at standard temperature and pressure (STP). You may figure it out by dividing the mass density (ρ) by the molar mass (M). It has the S.I. unit cubic meters per mole.

Thus, if a lab partner had allowed some of the water to siphon into the collection beaker before starting to heat the sample, the molar volume would be impacted too high. Therefore, option C is correct.

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The new freezing point of the solution if it is calculated that the freezing point changes by 1.09 C is -2.17° C.

Change in freezing point = x molality times Kf

Kf is the solvent's (water) freezing point constant, and molality is the solute's molal concentration in the solvent.

We can enter the following values into the algorithm to solve for molality because the freezing point reduction is specified as 1.09°C:

Kf x molality = 1.09

Water has a 1.86°C/m freezing point reduction constant. As a result, we have:

Molality equals 1.09 / 1.86 to 0.586 mol/kg.

We can use: to ascertain the solution's new freezing point:

Change in freezing point = m x I x Kf

As a result, we have:

[tex]T_{f}[/tex] = Kf x m x I = 1.86 °C per mete x 0.586 mol/kg x 2 = 2.17 °C

New freezing point is equal to 0 - 2.17 = -2.17 C.

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The 3p subshell can carry a maximum of 6 electrons, which is the maximum number an electron can be held by a 3p sublevel.

The electron is the lowest atom-forming particle or a carrier of such a negative charge. The protons in an atom that is neutral are all the same. For example, the hydrogen atom only contains one proton and one electron. The uranium atom is unique due to its 92 protons & 92 electrons.

The negatively charged atom's electrons are responsible for this. An atom's total negative charge, which is produced by all of its electrons, counteracts the positive electrical charge of a protons inside the atomic nucleus.

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The total pressure after the valve is opened and the gases mix is 6.875 kPa

What is ideal gas law?

The ideal gas law is a fundamental equation in physics and chemistry that relates the pressure, volume, temperature, and number of molecules of an ideal gas. The equation is expressed mathematically as:

PV = nRT

To find the total pressure after the valve is opened and the gases mix, we can use the ideal gas law, which states:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature. Assuming the temperature is constant and the gases behave ideally, we can write:

(P₁V₁+ P₂V₂) / (V₁+ V₂) = Ptotal

where P1 and V1 are the pressure and volume of the oxygen, P2 and V2 are the pressure and volume of the helium, and Ptotal is the total pressure after the valve is opened.

Plugging in the values, we get:

(P₁V1+ P₂V₂) / (V₁+ V₂) = Ptotal

((10kpa)(3L) + (5kpa)(5L)) / (3L + 5L) = Ptotal

(30kpa + 25kpa) / 8L = Ptotal

55kpa / 8L = Ptotal

Therefore, the total pressure after the valve is opened and the gases mix is 6.875 kPa (rounded to three significant figures).

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The balanced complete neutralization reaction between each pair of reactants are-

CH₃COOH + NaOH → CH₃COONa + H₂O

CaCO₃ + HCl → CaCl₂ + H₂CO₃

What is balancing of a reaction?

Balancing of a reaction is based on Law of conservation of mass where we have to balance masses of the reactants and products in LHS and RHS of a chemical reaction.

For e.g -

6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂

Therefore, the balanced complete neutralization reaction between each pair of reactants are-

CH₃COOH + NaOH → CH₃COONa + H₂O

CaCO₃ + HCl → CaCl₂ + H₂CO₃

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Bohr model of oxygen relates to the electron-dot structure of oxygen as

in electron dot structure an atom must have 8 electrons in it's surrounding and oxygen also has 8 electrons in total.

What Is Bohr's model of an atom?

The postulates of Bohr's Model of an atom are-

(1) Electrons revolve around the nucleus in a certain definite path called orbit or stationary state of shell.

(2) The shells are having different energy levels denoted as K, L, M, N ...

(3) As long as the electron remains in an orbit, they neither absorb nor emit energy.

(4) The electron can move only in that orbit in which angular momentum is quantized, i.e., the angular momentum of the electron is an integral multiple of h/2π .

Therefore, Bohr model of oxygen relates to the electron-dot structure of oxygen as in electron dot structure an atom must have 8 electrons in it's surrounding and oxygen also has 8 electrons in total.

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The prefix "deci" is used to express one tenth of the unit of any measurement. For example decimeter is the one tenth of the one meter length.

Metric system is a n international system of units. Under the direction of an international standards body, the historical evolution of these systems culminated in the definition of the International System of Units (SI) in the middle of the 20th century. Metrication is the process of converting to the metric system.

There are many prefix that indicates the exact measurement of a variable under different situations. There are prefix like, centi, deci, micro, milli etc. The prefix deci is used to express one tenth (1/10) of the unit.

One decimeter is one tenth of 1 m. That is 10⁻¹ m. Similarly we can use the prefix deci to other variables such as deciliter, decigram etc. Usually used to express small length in metric system.

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The purpose of this lab was to explore the concept of percent yield and to determine how it can be affected during experimentation. We learned that percent yield is the ratio of the actual yield of a product.

Ratio is a mathematical comparison of two related values or quantities. It is expressed as a fractional relationship, such as "2 to 4," "1:4," or "2/4." In mathematics, ratios are used to make comparisons between two or more quantities. Ratios can be used to measure how one quantity is related to another, or to compare two or more items. For example, if a person weighs 120 pounds and their height is 5 feet, the ratio of their weight to their height is 120:5 or 24:1. Ratios can also be used to compare items in different categories, such as the number of people in a group to the number of cars they own, or the number of apples to oranges in a basket.

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3.011  × 10²³ molecules are in 0.5 moles of PCl₃.

The mole is an amount unit similar to familiar units like pair, dozen, gross, etc. It provides a specific measure of the number of atoms or molecules in a bulk sample of matter.

A mole is defined as the amount of substance containing the same number of atoms, molecules, ions, etc. as the number of atoms in a sample of pure 12C weighing exactly 12 g.

Given,

Moles of PCl₃ = 0.5 moles

We know that 1 mole = 6.023 × 10²³ molecules

Thus, 0.5 moles will have 6.023 × 10²³ × 0.5 molecules.

= 3.011  × 10²³ molecules

Therefore, 3.011  × 10²³ molecules are in 0.5 moles of PCl₃.

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No, I do not think the Chernobyl accident has been ecologically beneficial for the ecosystems within the exclusion zone.

An exclusion zone is an area that is restricted by a government or other authority, typically in response to a threat to public safety. It is used to limit or prevent access to a certain location, often due to the presence of hazardous material or a natural disaster. Exclusion zones can be created around a disaster area, a nuclear facility, or a toxic waste site, and in some cases, they can be used to protect sensitive military installations.

No, I do not think the Chernobyl accident has been ecologically beneficial for the ecosystems within the exclusion zone. The contamination from the radioactive fallout is more damaging and dangerous to biodiversity than the presence of a large human population. This is because the radiation exposure from the accident has resulted in widespread ecological damage, including the death of trees and other vegetation, disruption of food webs, and the displacement of species. Additionally, radioactive contaminants can accumulate in the tissues of plants and animals, and can be passed up the food chain, leading to further damage. In contrast, the presence of a large human population can cause localized disturbances, such as habitat destruction, but these effects are generally localized, and can be mitigated by conservation measures.

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When 28g of Fe(OH)₃ are made in this reaction then 31.4g of NaOH forms.

What is Mole concept?

The mole concept is a convenient method of expressing the amount of a substance.

Avogadro's number is the number of units in one mole of any substance and equals to 6 .02214076 × 1023. The units can be electrons, atoms, ions, or molecules.

No. of moles is defined as a particular no. of particles that we can calculate with the help of Avogadro’s number.

Given,

Mass of Fe(OH)₃ = 28g

We know that Molecular mass of NaOH = 40g

Molecular mass of Fe(OH)₃ = 106.8g

According to the equation given in question,

3 moles of NaOH forms 1 mol of Fe(OH)₃

Hence, 40×3 = 120g of NaOH forms 106.8g Fe(OH)₃

1g Fe(OH)₃ will formed by = 120÷106.8 g NaOH = 1.12g

28g of Fe(OH)₃ will formed by = 1.12×28 = 31.4g NaOH

Therefore, When 28g of Fe(OH)₃ are made in this reaction then 31.4g of NaOH forms.

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Answer: The equation of the dissociation of the solution is given below:NaCH3COO -----> CH3COO- + Na+HA -----> A- + H+Using the equation of dissociation constant, Ka:Ka = [A-][H+]/[HA][H] = [A-][H+] = 10^-(pH)[H+] = 10^-9.44[H+] = 3.63 × 10^-10 MThus, [A-] = 3.63 × 10^-10 M[HA] = [A-][H+]/Ka[HA] = (3.63 × 10^-10 M)^2 / 1.8 × 10^-5[HA] = 7.32 × 10^-15 M

Therefore, the molarity of the sodium acetate (NaCH3COO) solution is 7.32 × 10^-15 M.

Explanation:

18 moles of oxygen can be produced by decomposing 12 moles of KClO₃.

The balanced chemical equation for the decomposition of KClO₃ is:

2KClO₃ → 2KCl + 3O₂

According to the equation, for every 2 moles of KClO₃ decomposed, 3 moles of O₂ are produced. So, to determine how many moles of O₂ are produced by decomposing 12 moles of KClO₃, we can use the following proportion:

2 moles KClO₃ / 3 moles O₂ = 12 moles KClO₃ / x moles O₂

where x is the number of moles of O₂ produced.

Solving for x, we get:

x = (3 moles O₂)(12 moles KClO₃) / (2 moles KClO₃)

x = 18 moles O₂

Therefore, 12 moles of KClO₃ can produce 18 moles of O₂.

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Answer:

One team pulls with more force than the other

Answer:

First, we need to calculate how much sodium hypochlorite is in 1 gallon of 0.110% bleach solution:

0.110% (m/v) = 0.110 g/100 mL

1 gallon = 3,785 mL

So, the mass of sodium hypochlorite in 1 gallon of 0.110% bleach solution is:

0.110 g/100 mL x 3,785 mL = 4.1635 g

Now we can use this information to calculate how much undiluted household bleach we need:

5.25% (m/v) = 5.25 g/100 mL

Let's call the volume of undiluted bleach we need "V".

We can set up a proportion:

5.25 g/100 mL = 4.1635 g/3785 mL

Solving for V:

5.25 g/100 mL = x/3785 mL

x = 199.0425 g

Finally, we need to convert grams to cups. The density of household bleach is about 1.08 g/mL, so:

199.0425 g ÷ 1.08 g/mL = 184.31 mL

There are 48 teaspoons in a cup, and 5 mL in a teaspoon, so:

184.31 mL ÷ 5 mL/teaspoon ÷ 48 teaspoons/cup ≈ 0.77 cups

Therefore, you should measure approximately 0.77 cups of household bleach to make 1.00 gallon of diluted bleach solution.

Answer: The answer to this question is negative 40 degrees Fahrenheit

Explanation:

Explanation:

The first law of thermodynamics can be written as:

ΔU = Q - W

where ΔU is the change in internal energy, Q is the heat added to the system, and W is the work done by the system.

We know that ΔU = 9135 J and W = 346 J. We also know that the gas was heated from 25 ∘C to 225 ∘C. Therefore, the change in temperature is:

ΔT = 225 ∘C - 25 ∘C = 200 ∘C

We can use the specific heat formula to solve for the specific heat of the gas:

Q = mcΔT

where m is the mass of the gas and c is the specific heat of the gas.

Solving for c, we get:

c = Q / (mΔT)

Substituting the given values, we get:

c = 346 J / (80.0 g × 200 ∘C) = 0.0216 J/(g⋅ ∘C)

Therefore, the specific heat of the gas is 0.0216 J/(g⋅ ∘C).

The lines with the arrow that points inwards radiating from the charge from all directions. Therefore, option B is correct.

Electric field is generated by the charged bodies. The electric field lines around a positive charges will always be outward to all directions. The field lines around a negative point charge is always inward from all directions.

At one point, a field line is drawn tangential to the net. As a result, the direction of the electric field at any point is the same as the tangent to the electric field line. Second, the relative strength (magnitude) of the electric field at a point is correlated with the relative density of the field lines around that point. 

Always pointing away from a positive charge and in the direction of a negative point are electric field lines. In actuality, positive charges are where electric fields begin and negative charges are where they end. Field lines never cross one another, too. If they do, it suggests that the electric field there has two directions.

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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.

Answer:

The mass of 0.25 moles of calcium sulfate is 34.035 grams

Explanation:

mass=number of moles × molar mass

= 0.25 × 134.14 g/ml

= 34.035g

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)  

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In one mole of Mg(OH)2, there are 2 moles of OH. Therefore, in 1.20 moles of Mg(OH)2, there are: 2 moles of OH/mol of Mg(OH)2 x 1.20 mol of Mg(OH)2 = 2.4 moles of OH.

Mole measures the quantity of chemicals, whereas molarity measures the concentration of those substances. The amount of chemicals in a combination can be estimated by looking at its molarity. One volume of a solvent is equal to the number of moles of a material. Molarity is not a unit, although a mole is.

Molarity (M) is calculated by dividing the volume of the solution (V) in litres by the number of moles of solute (n). Not moles of solute per litre of solvent, but rather moles of solute per litre of solution, is a crucial distinction to make when defining molarity.

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Answer:

Explanation:

The balanced chemical equation for the neutralization reaction between chromic acid (H2CrO4) and potassium hydroxide (KOH) is:

H2CrO4 + 2KOH → K2CrO4 + 2H2O

From the equation, we see that 1 mole of H2CrO4 reacts with 2 moles of KOH.

First, we need to calculate the number of moles of chromium in the 10.0 mL sample of chromic acid:

mass of chromium = 42.0 mg

molar mass of chromium = 52.00 g/mol

moles of chromium = (42.0 mg / 1000 mg/g) / 52.00 g/mol = 0.000807 moles

Since the stoichiometry of the reaction is 1:2 for H2CrO4:KOH, we need twice as many moles of KOH as we have of H2CrO4 to fully neutralize the acid. Therefore, we need:

2 x 0.000807 = 0.001614 moles of KOH

Now we can use the molarity and the number of moles of KOH to calculate the volume of KOH solution needed:

moles of KOH = molarity x volume (in L)

volume (in L) = moles of KOH / molarity

volume (in L) = 0.001614 mol / 0.140 mol/L = 0.01153 L

Finally, we need to convert the volume from liters to milliliters:

volume (in mL) = 0.01153 L x 1000 mL/L = 11.53 mL

Therefore, the volume of 0.140 M KOH needed to neutralize the 10.0 mL sample of chromic acid is 11.53 mL (to three significant figures).

The enthalpy of formation of solid copper metal and and hydrogen gas is zero. The enthalpy of formation of water is - 286 KJ. From this, the enthalpy of formation of solid CuO is - -156.3 KJ.

The heat energy absorbed or evolved by a reaction is called the reaction enthalpy. The enthalpy required for the formation of one mole of a compound from its constituent elements is called enthalpy of formation.

The reaction enthalpy for a reaction is:

∑ ΔH (products) - ∑ ΔH (reactants)

given ΔHrxn = -129.7 KJ.

ΔH (H₂O (l)) +ΔH (Cu((s))  - ∑ ΔH (CuO) + ΔH (H₂) = -129.7 KJ

From the standard data of  enthalpy of formation,

ΔH (H₂O (l)) = - 286 KJ

ΔH (Cu((s)) = 0

ΔH (H₂) = 0.

Then,

ΔH (H₂O (l))  - ΔH (CuO) = -129.7 KJ.

- 286 KJ - ΔH (CuO) = - 129.7 KJ.

ΔH (CuO) = - 286 KJ - (-129.7 KJ ) = -156.3 KJ.

Therefore, the enthalpy of formation of CuO (s) is - 156.3 KJ.

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The empirical formula of decaborane is B5H7.

To find the empirical formula of decaborane, we need to determine the simplest whole-number ratio of atoms in the compound.

The molecular formula of decaborane is B10H14, which means it contains 10 boron atoms and 14 hydrogen atoms.

To determine the simplest ratio of boron to hydrogen atoms, we can divide each by the greatest common factor (GCF) of the two numbers.

The GCF of 10 and 14 is 2, so we divide each by 2:

B10H14 becomes B5H7

Therefore, the empirical formula of decaborane is B5H7 from B10H14

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Answer:

(a) Cr3+ and Br- will form CrBr3 (chromium(III) bromide)

(b) Fe3+ and O2- will form Fe2O3 (iron(III) oxide)

(c) Hg22+ and CO32- will form Hg2CO3 (mercury(I) carbonate)

(d) Ca2+ and ClO3- will form Ca(ClO3)2 (calcium chlorate)

(e) NH4+ and PO43- will form (NH4)3PO4 (ammonium phosphate)

Explanation:

chatGPT

The chemical formulas for the compounds formed by the given pairs of ions are: (a) CrBr3, (b) Fe2O3, (c) Hg2(CO3)2, (d) Ca(ClO3)2, and (e) (NH4)3PO4.

(a) Cr3+ and Br- : In order to form a neutral compound, the charges of the ions must balance. The charge of Cr3+ is 3+ and the charge of Br- is 1-. To balance the charges, we need three Br- ions for every Cr3+ ion. Therefore, the chemical formula is CrBr3.

(b) Fe3+ and O2- : The charge of Fe3+ is 3+ and the charge of O2- is 2-. To balance the charges, we need two O2- ions for every Fe3+ ion. Therefore, the chemical formula is Fe2O3.

(c) Hg22+ and CO2- : The charge of Hg22+ is 2+ and the charge of CO2- is 2-. The charges are already balanced, so no extra ions are needed. Therefore, the chemical formula is Hg2(CO3)2.

(d) Ca2+ and ClO3- : The charge of Ca2+ is 2+ and the charge of ClO3- is 1-. To balance the charges, we need two ClO3- ions for every Ca2+ ion. Therefore, the chemical formula is Ca(ClO3)2.

(e) NH4+ and PO3- : The charge of NH4+ is 1+ and the charge of PO3- is 3-. To balance the charges, we need three NH4+ ions for every PO3- ion. Therefore, the chemical formula is (NH4)3PO4.

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Answer:

Vitamins are essential organic compounds that are required in small amounts to maintain various physiological processes in the human body. They are classified into two groups: fat-soluble vitamins (A, D, E, and K) and water-soluble vitamins (B-complex vitamins and vitamin C).

The dietary sources and biochemical functions of each vitamin are as follows:

Vitamin A - Found in liver, fish, eggs, and dairy products. It is required for vision, immune function, and growth.

Vitamin D - Found in fatty fish, eggs, and fortified dairy products. It is required for bone health and helps the body absorb calcium.

Vitamin E - Found in nuts, seeds, and vegetable oils. It acts as an antioxidant and helps protect cells from damage.

Vitamin K - Found in green leafy vegetables and certain fruits. It is required for blood clotting.

B-complex vitamins - Found in meat, fish, poultry, whole grains, and fortified cereals. They play various roles in energy production, nervous system function, and red blood cell formation. Examples include:

Vitamin B1 (Thiamine) - Required for energy production and nerve function. Deficiency can cause beriberi.

Vitamin B2 (Riboflavin) - Required for energy production and cell growth. Deficiency can cause skin and eye disorders.

Vitamin B3 (Niacin) - Required for energy production and proper digestion. Deficiency can cause pellagra.

Vitamin B5 (Pantothenic Acid) - Required for energy production and hormone synthesis. Deficiency is rare.

Vitamin B6 (Pyridoxine) - Required for protein metabolism and immune function. Deficiency can cause anemia and neurological problems.

Vitamin B7 (Biotin) - Required for energy production and proper metabolism. Deficiency is rare.

Vitamin B9 (Folate) - Required for cell growth and development. Deficiency can cause anemia and birth defects.

Vitamin B12 (Cobalamin) - Required for nerve function and DNA synthesis. Deficiency can cause anemia and neurological problems.

Vitamin C - Found in citrus fruits, strawberries, kiwi, and bell peppers. It acts as an antioxidant and is required for collagen synthesis. Deficiency can cause scurvy.

In summary, vitamins are essential nutrients required for a range of functions in the body. They can be obtained through a balanced diet, and deficiency of any vitamin can lead to various health problems.

Explanation:

To get a positive specific heat capacity, we would need to reverse the sign of ΔT1. However, the magnitude of c would still be the same. Therefore, the specific heat capacity of the metal is 0.137 J/(g·◦C).

Specific heat capacity is the amount of heat energy required to raise the temperature of one unit of mass of a substance by one degree Celsius (or one Kelvin). It is a property that describes how much heat energy a material can absorb or release when its temperature changes.

The specific heat capacity of a substance depends on its chemical composition and physical state.

Assuming that no heat is lost to the surroundings, we can write:

heat gained by metal = heat lost by water

The heat gained by the metal can be calculated as:

q1 = mcΔT1

where m is the mass of the metal, c is its specific heat capacity (which we need to find), and ΔT1 is the change in temperature of the metal.

The heat lost by the water can be calculated as:

q2 = mcΔT2

where m is the mass of the water, c is the specific heat capacity of water (which is 4.184 J/(g·◦C)), and ΔT2 is the change in temperature of the water.

We know the initial and final temperatures of the metal and water, so we can calculate the changes in temperature:

ΔT1 = (30 ◦C) - (89 ◦C) = -59 ◦C

ΔT2 = (30 ◦C) - (21 ◦C) = 9 ◦C

We also know the masses of the metal and water:

m1 = 33 g

m2 = 43 g

Using the law of conservation of energy, we can set q1 equal to q2 and solve for c:

mcΔT1 = mcΔT2

c = (m2/m1) * (ΔT2/ΔT1) * 4.184 J/(g·◦C)

Plugging in the given values, we get:

c = (43 g / 33 g) * (9 ◦C / -59 ◦C) * 4.184 J/(g·◦C)

c = -0.137 J/(g·◦C)

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The mass of mercury produced when 1.25g of mercury(II) oxide (HgO) is decomposed will be 1.247 g.

Decomposition means to break up into component parts by chemical activity. Chemical decomposition, also known as chemical breakdown, is the activity of breaking down a single chemical entity (such as a regular molecule, reaction intermediate, etc.) into two or more pieces.

The precise opposite of chemical synthesis is often understood and characterized as chemical breakdown.

The reaction for the given question is:

2 HgO(s) → 2 Hg(l) + O₂(g)

Molar mass of Hg = 200.59 g/mol

Given, mass of HgO = 1.25g

Thus, moles of Hg = 1.25 g / 200.59 g/mol = 0.006225 mol

Therefore, mass of mercury produced from HgO by decomposition = 0.006225 mol × 200.59 g/mol = 1.247 g.

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