Balance the chemical equation below using the smallest possible whole number stoichiometric coefficients. C(s) + H2(g) --> C2H6(g)?

The empirical formula of the compound is C₃H₃S.

Explanation:

molecular weight of CO₂ = 44 g/mole

molecular weight of H₂O = 18 g/mole

Knowing the molecular weights of the compounds we devise the following reasoning:

if in           44 g of CO₂ there are 12 g of C

then in  5.48 g of CO₂ there are X g of C

X = (5.48 × 12) / 44 = 1.49 g C

if in           18 g of H₂O there are 2 g of H

then in    1.13 g of H₂O there are Y g of H

Y= (1.13 × 2) / 18 = 0.126 g H

mass of compound = mass of C + mass of H + mass of S

mass of S = mass of compound - mass of C - mass of H

mass of S = 2.95 - 1.49 - 0.126 = 1.33 g S

Now to find the empirical formula of the compound we use the fallowing algorithm:

we devise each mass by the molar weight of the element:

for C   1.49 / 12 = 0.124

for H   0.126 / 1 = 0.126

for S   1.33 / 32 = 0.0416

now we divide the result by the lowest number which is 0.0416

for C    0.124 / 0.0416 ≈ 3

for H    0.126 / 0.0416 ≈ 3

for S    0.0416 / 0.0416 = 1

The empirical formula of the compound is C₃H₃S.

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Answer:

84.0 g/mol

Explanation:

Molar mass of NaHCO₃ = ?

Solution:

Molar mass is the sum of masses of all atom present in formula.

Molar mass of sodium = 23 g/mol

Molar mass of hydrogen = 1.008 g/mol

Molar mass of carbon = 12 g/mol

Molar mas of Oxygen = 16 g/mol

Molar mass of NaHCO₃ = 23 + 1.008 + 12 + 16× 3

Molar mass of NaHCO₃ = 23 + 1.008 + 12 + 48

Molar mass of NaHCO₃ = 84.008 g/mol

To the nearest tenth = 84.0 g/mol

Answer:

84 g/mol.

Explanation:

Hello,

In this case, for us to compute such mass, we consider the atomic mass of sodium, hydrogen, carbon and oxygen as well as the three as the oxygen's subscript indicating there are three oxygens. Thus, the molar mass results

[tex]M=m_{Na}+m_{H}+m_{C}+*3m_{O}=23g/mol+1g/mol+12g/mol+3*16g/mol\\M=84g/mol[/tex]

Best regards.

Answer:

It is basic and has a pH of 9.8.

Explanation:

pOH = 4.2

we will determine its pH.

pOH + pH = 14

pH = 14 - pOH

pH = 14 - 4.2

pH = 9.8

According to pH scale the the pH lower than 7 is consider acidic while pH of seven is neutral and pH greater than 7 is basic.

The given solution has pH 9.8 it means it is basic.

Answer: D) It is basic and has a pH of 9.8.

Answer:

decomposition

Balanced chemical equation:

2HgO → 2Hg + O₂

Explanation:

Chemical equation:

HgO → Hg + O₂

Balanced chemical equation:

2HgO → 2Hg + O₂

The given reaction shows the decomposition reaction. Mercury oxide decompose and produced its constituent elements mercury and oxygen.

The oxidation state of mercury is +2 while that of oxygen is -2.

Decomposition reaction:

It is the reaction in which one reactant is break down into two or more product.

General equation:

AB → A + B

Answer:

1.6 ×10⁻¹ kj

Explanation:

Given data:

Mass of chloroethane = 0.38 g

Heat absorbed = ?

Solution:

Molar mass of chloroethane = 64.51 g/mol

Molar heat of vaporization = 26.4 kj/mol

Number of moles:

Number of moles = mass/ molar mass

Number of moles = 0.38 g/ 64.51 g/mol

Number of moles = 0.006 mol

Heat absorbed:

0.006 mol × 26.4 kj/mol

0.16 kj

or 1.6 ×10⁻¹ kj

Answer:

1.6 ×10⁻¹ kj

Explanation:

Answer:

P₂ = 469.7 mmHg

Explanation:

Given data:

Initial volume = 227 mL

Initial pressure = 571 mmHg

Initial temperature = 175 K

Final temperature =  357 K

Final volume = 563 mL

Final pressure = ?

Formula:

P₁V₁/T₁ = P₂V₂/T₂  

P₁ = Initial pressure

V₁ = Initial volume

T₁ = Initial temperature

P₂ = Final pressure

V₂ = Final volume

T₂ = Final temperature

Solution:

P₂ = P₁V₁ T₂/ T₁ V₂  

P₂ = 571 mmHg × 227 mL × 357 K / 175 K ×  563 mL

P₂ = 46273269 mmHg . mL. K / 98525 k. mL

P₂ = 469.7 mmHg

Final answer:

Using the combined gas law equation, we can determine the final pressure of the gas sample.

Explanation:

To solve this problem, we can use the combined gas law equation: P1V1/T1 = P2V2/T2. We are given the initial pressure, volume, and temperature, as well as the final volume and temperature. Let's plug in the values:
P1 = 571. mm Hg
V1 = 227 mL
T1 = 175 K
V2 = 563 mL
T2 = 357 K.
Now we can solve for P2, the final pressure:

P2 = (P1 * V1 * T2) / (V2 * T1)

Plugging in the values, we get:

P2 = (571. mm Hg * 227 mL * 357 K) / (563 mL * 175 K) = 610. mm Hg.

Answer:

% (COOK)2H2O = 37.826 %

Explanation:

mix: (COOK)2H2O + Ca(OH)2 → CaC2O4 + H2O

∴ mass mix = 4.00 g

∴ mass (CaC2O4)H2O = 1.20 g

∴ Mw (COOK)2H2O = 184.24 g/mol

∴ Mw (CaC2O4)H2O = 146.12 g/mol

∴ r = mol (COOK)2H2O / mol (CaC2O4)H2O = 1

⇒ mass (COOK)2H2O = (1.20 g (CaC2O4)H2O)×(mol (CaC2O4)H2O / 146.12 g (CaC2O4)H2O)×(mol (COOK)2H2O/mol (CaC2O4)H2O)×(184.24 g (COOK)2H2O/mol (COOK)2H2O)

⇒ mass (COOK)2H2O = 1.513 g

⇒ % (COOK)2H2O = ( 1.513 g / 4 g )×100

⇒ % (COOK)2H2O = 37.826 %

Final answer:

The percentage of the 4.00 g mixture that is potassium oxalate is 37.75%.

Explanation:

When attempting to determine what percentage of a 4.00 g mixture is potassium oxalate, we begin by using the information provided about the mass of calcium oxalate hydrate recovered.

Given:

Mass of calcium oxalate hydrate recovered = 1.20 g

Molar mass of calcium oxalate hydrate = 146.12 g/mol

Mole:mole ratio of potassium oxalate to calcium oxalate = 1:1

We can calculate the number of moles of calcium oxalate hydrate:

\( \text{Moles of calcium oxalate} = \frac{1.20\,g}{146.12\,g/mol} = 0.00821\,mol \)

Since the ratio of potassium oxalate to calcium oxalate is 1:1, moles of potassium oxalate will be the same, 0.00821 mol.

Now we calculate the mass of the potassium oxalate hydrate:

\( \text{Mass of potassium oxalate} = 0.00821\,mol \times 184.24\,g/mol = 1.51\,g \)

To find the percentage of the mixture that is potassium oxalate:

\( \text{Percentage of potassium oxalate} = \frac{1.51\,g}{4.00\,g} \times 100\% = 37.75\% \)

Therefore, 37.75% of the 4g mixture is potassium oxalate.

Answer:

1121.08 millilitres of 0.223 M [tex]KNO_{3}[/tex] solution contains 0.250 moles of [tex]KNO_{3}[/tex].

Explanation:

The formula for molarity of a solution:

[tex]Molarity=\frac{n}{V}\\ where,n=number\: of\:moles\\V=volume\:of\:solution\:in\:L[/tex]

Molarity = 0.223 M

n = 0.250 moles

[tex]V=\frac{n}{Molarity}=\frac{0.250}{0.223}=1.12108L=1121.08mL[/tex]

Therefore, 1121.08 millilitres of 0.223 M  [tex]KNO_{3}[/tex] solution contains 0.250 moles of  [tex]KNO_{3}[/tex].

SrCO₃ + H₂SO₄ → SrSO₄ + H₂O + CO₂

We are required to complete the chemical equation given;

strontium carbonate + sulfuric acid → ??

SrCO₃ + H₂SO₄ → SrSO₄ + H₂O + CO₂

The reaction between strontium carbonate and sulfuric acid produces strontium sulfate, carbon dioxide, and water. The balanced chemical equation would be: SrCO3(s) + H₂SO₄ (aq) → SrSO4 (aq) + CO₂(g) + H₂O(l).

The reaction between strontium carbonate and sulfuric acid is a type of acid-carbonate reaction, which generally results in the formation of a salt, carbon dioxide, and water. Although the reaction for strontium carbonate and sulfuric acid is not provided, we can deduce it from similar reactions. For instance, the reaction of sulfuric acid with calcium carbonate is shown by the equation:

CaCO3(s) + H₂SO₄ (aq) → CaSO4 (aq) + H₂O(l) + CO₂(g) ↑

Based on this example, the balanced chemical equation for the reaction between strontium carbonate and sulfuric acid likely follows a similar pattern and would be written as:

SrCO3(s) + H₂SO₄ (aq) → SrSO4 (aq) + CO₂(g) + H₂O(l)

This equation indicates that when strontium carbonate (SrCO3) reacts with sulfuric acid (H₂SO₄), they produce strontium sulfate (SrSO4), carbon dioxide (CO₂), and water (H₂O).

Answer:

I think it's hydrogen

Explanation:

Answer:

The percent by mass of water in the hydrate is 45.4%

The percent by mass of the anhydrous salt in the hydrate is 54.6%

Explanation:

The percent by mass of water in the hydrate is 69.23% and the percent by mass of the anhydrous salt in the hydrate is 54.44%.

To find the percent by mass of water in the hydrate, we can use the following formula:

percent by mass of water = (mass of water)/(mass of hydrate) * 100%

Mass of water = 7 moles of H₂O * 18 g/mol

= 126 g

Mass of hydrate = 1 mole of FeSO₄ • 7H₂O

= 278 g

Plugging these values into the formula, we get:

percent by mass of water = (126 g)/(278 g) * 100%

= 45.56%

We can also find the percent by mass of the anhydrous salt in the hydrate by subtracting the percent by mass of water from 100%.

percent by mass of anhydrous salt = 100% - 45.56%

= 54.44%

Therefore, the percent by mass of water in the hydrate is 69.23%, and the percent by mass of the anhydrous salt in the hydrate is 54.44%.

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165.078 g

We are given;

We are required to calculate the mass of nickel sample;

We know that quantity of heat absorbed, Q = m × c × ΔT

Change in temperature, ΔT = 35.5°C - 20°C

                                              = 15.5 °C

Therefore, Q = 250 g × 4.1 J/g°C × 15.5° C

                     = 16,197.5 Joules

Assuming the mass of nickel sample is m

Then, Heat released, Q = m × c × ΔT

Change in temperature, ΔT = 255.5 °C - 35.5 ° C

                                              = 220 °C

Q = m × 0.446 J/g°C × 220° C

   = 98.12m joules

We know that the amount of heat absorbed is equivalent to amount of heat released.

That is, Quantity of heat absorbed = Quantity of heat released

Therefore;

98.12 m joules = 16,197.5 Joules

    m = 165.078 g

Thus, the mass of nickel sample is 165.078 g

Answer:

KOH

Explanation:

Chemical reaction:

2K + 2H₂O →  2KOH + H₂

Element ratio of K.

K = 1

Because only potassium is present.

Element ratio of H₂O.

2 : 1

in water ratio of element is 2 : 1 because two hydrogen and one oxygen atom present.

Element ratio of KOH

1 : 1 : 1

in KOH elemental ratio is 1 : 1 : 1 because one potassium one hydrogen and one oxygen atom are present.

Element ratio of H₂.

2

Just two atoms of hydrogen are present.

Answer:

yes

Explanation:

Polyatomic ions are ions which consist of more than one atom. For example, nitrate ion, NO3-, contains one nitrogen atom and three oxygen atoms. The atoms in a polyatomic ion are usually covalently bonded to one another, and therefore stay together as a single, charged unit.

Polyatomic ions are charged entities composed of multiple atoms, like the nitrate ion (NO3-) which has one nitrogen atom and three oxygen atoms with a -1 charge. Oxoanions such as nitrate and nitrite differ in their oxygen content but share the same charge.

Nitrate and Polyatomic Ions

Polyatomic ions are charged species composed of two or more atoms covalently bonded, or of a metal complex that can be considered as acting as a single unit. The characteristic feature of a polyatomic ion is that it carries an overall ionic charge. A common example is the nitrate ion, with the chemical formula NO3−, consisting of one nitrogen atom and three oxygen atoms and carrying an overall charge of -1.

Polyatomic ions, including nitrate, are often found as part of ionic compounds. For instance, when we see calcium nitrate, the formula is Ca(NO3)2.

The term 'oxoanions' is used to describe polyatomic ions containing oxygen, such as nitrate and nitrite. These differ in the number of oxygen atoms present: nitrate has three, while nitrite (NO2) has two, and both carry the same charge of -1. The 'ate' and 'ite' suffixes signify more oxygen and fewer oxygen atoms, respectively.

Answer:

perennial

Explanation:

Answer:

True

Explanation:

Ionic bonds are stronger than covalent bonds because, there is mutual attraction between oppositely charged ions while a Covalent Bond is a bond that results from a sharing of electrons between nuclei.

Answer:

ionic bond

Explanation:

Noble gases have complete octet. The elements near to noble gases gain electrons and get stable electronic configuration by completing the octet.

Consider the example of halogen element:

Ionic bond:

It is the bond which is formed by the transfer of electron from one atom to the atom of another element.  

Both bonded atoms have very large electronegativity difference. The atom with large electronegativity value accept the electron from other with smaller value of electronegativity .

For example:

Sodium chloride is ionic compound. The electronegativity of chlorine is 3.16 and for sodium is 0.93. There is large difference is present. That's why electron from sodium is transfer to the chlorine. Sodium becomes positive and chlorine becomes negative ion.  Chlorine have seven valance electrons and sodium have one valance electron. To complete the octet sodium lose its one electron and chlorine accept one electron and form ionic compound.

Final answer:

Elements near the noble gases tend to form covalent bonds, which occurs between nonmetal elements through the sharing of electrons.

Explanation:

Elements near the noble gases on the periodic table tend to form covalent bonds. Covalent bonds form between nonmetal elements, typically resulting from the sharing of electrons. In comparison, ionic bonds usually occur between a metal and a nonmetal, driven by the electrostatic forces between ions of opposite charge.

Another type of bond is the metallic bond, which is found within solid metals where each metal atom is bonded to several neighboring atoms and the electrons are free to move throughout the structure. Correct answer to Q 25: Covalent bonds form between Nonmetal to Nonmetal.

Answer:

0.2 M

Explanation:

Let's start by looking at a molecule of sodium sulfate.

Sodium sulfate is made up of sodium and sulfate ions. Sodium(Na) ion is given as Na(+1) where +1 is the valency of the Na atom or the charge on the Na ion.  On the other hand sulfate( S[tex]O_{4}[/tex]) ion is represented as S[tex]O_{4}[/tex](-2) where -2 is charge on the sulfate ion. We know that a molecule is electrically neutral. Here the sodium and sulfate ions have charges of +1 and -2 respectively. Hence, for the sodium sulfate which is a compound containing soidum and sulfate ions, there should be 2 ions of sodium and an ion of sulfate, so that it is electrically neutral. Therefore the molecular formula of sodium sulfate is given as : [tex]Na_{2}[/tex][tex]SO_{4}[/tex].

Now we know that one molecule of sodium sulfate has 2 atoms of sodium ions in it. Also, one molar (1M) is 1 mole of the substamce in 1L of soltuion. And 0.1M means 0.1mole of substance (here it is sodium sulfate) in 1L of the solution. 1 molecule of sodium sulfate contains 2 atoms of sodium ions. Therefore, 1 mol of sodium sulfate contains 2 mols of sodium ions. Hence, 0.1mol of sodium sulfate contain 0.2 mols of sodium ions. Hence there are 0.2mols of sodium ions in the solution. Hence the concentration of sodium ion is 0.2M.

Answer:

Homogeneous solution

Explanation:

The salt and water dissolve to give a clear solution I.e without crystals.

The 3 liters closed container.

Explanation:

We have the ideal gas law:

PV = nRT

where:

P =  pressure

V = volume

n = number of moles

R = gas constant

T = temperature

The number of moles n₁ (which is 1 mole) from the 2 liter (V₁) container are equal to:

n₁ = PV₁ / RT

The number of moles n₂ from the second container ( (V₂) are equal to:

n₂ = PV₂ / RT

From the data given in the problem we know that:

n₂ =  3 × n₁

We replace the n's:

PV₂ / RT =3 × PV₁ / RT

(PV₂ / RT) × (RT / P) = 3 × V₁

V₂ = 3 × V₁

V₂ = 3 × 2

V₂ = 6 liters

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Final answer:

To hold 3 moles of an ideal gas at the same temperature and pressure as 1 mole in a 2-liter container, a 6-liter container is needed. This is based on Avogadro's law, which is a part of the ideal gas law.

Explanation:

The initial query pertains to how much volume would be required to contain 3 moles of an ideal gas under the same temperature and pressure conditions as a 2-liter container holding 1 mole. To find this, we apply the ideal gas law, which states that at constant temperature and pressure, the volume of a gas is directly proportional to the number of moles. Given that 1 mole of the gas occupies 2 liters, it follows that 3 moles would require a volume that is three times larger, thus requiring a 6-liter container.

According to Avogadro's law, which is part of the ideal gas law, at the same temperature and pressure, equal volumes of all gases contain the same number of moles. Therefore, to hold 3 moles of the ideal gas at the same temperature and pressure as 1 mole in 2 liters, we would need a container with a volume of 6 liters. This principle also explains why at standard temperature and pressure (STP), 1 mole of an ideal gas occupies 22.4 liters.

Answer:

P₂ = 0.94 atm

Explanation:

Given data:

Initial volume = 16 cm³

Final volume after mixing the initial volume into 1cm³ = 16 cm³ + 1 cm³ (17cm³)

Initial pressure = 1 atm

Final pressure = ?

Solution:

P₁V₁ = P₂V₂

P₂ = P₁V₁ /V₂

P₂ = 1 atm × 16 cm³  / 17cm³

P₂ = 16 cm³ . atm / 17cm³

P₂ = 0.94 atm

Pressure will change from 1 atm to 0.94 atm.

Dalton proposed the atomic theory, Thomson discovered the electron and proposed the Plum Pudding Model, Rutherford conducted the gold foil experiment and concluded the existence of a dense, positively charged nucleus, and Bohr introduced the concept of energy levels or shells in the atom.

Dalton: John Dalton proposed the atomic theory, which states that atoms are indivisible and indestructible building blocks of matter. He believed that all atoms of the same element are identical and each element is made up of atoms with unique properties.

Thomson: J.J. Thomson discovered the electron and proposed the Plum Pudding Model, which suggested that atoms are composed of a positively charged mass with negatively charged electrons embedded in it.

Rutherford: Ernest Rutherford conducted the famous gold foil experiment and concluded that atoms have a small, dense, positively charged nucleus at the center and electrons moving around it in a vast empty space.

Bohr: Niels Bohr introduced the idea of energy levels or shells in the atom. He proposed that electrons exist in fixed orbits around the nucleus and can jump between energy levels by absorbing or emitting energy in discrete amounts.

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Answer:

Multiply the acceleration by the time the object is being accelerated. For example, if an object falls for 3 seconds, multiply 3 by 9.8 meters per second squared, which is the acceleration from gravity. The resultant velocity in this case is 29.4 meters per second.

Explanation:

dont have one

Answer:

The group two on the left side of periodic table have alkaline earth metals.

Explanation:

The group two elements are called alkaline earth metals. All elements have two valance electrons. This family include,

Beryllium

Magnesium

Calcium

Strontium

Barium

Radium

All of these combine with halogen atoms and formed salt.

These are shiny.

They have low densities.

These metals react with oxygen and form oxides.

Except strontium and magnesium all alkaline earth metals have one radioactive isotope.

All are these elements have low melting and boiling points.

The alkaline earth metals are located in Group II of the modern periodic table, including elements such as Beryllium, Magnesium, Calcium, Strontium, Barium, and Radium. They share common properties, including being shiny, silvery-white, and reactive.

The region which contains the alkaline earth metal family of elements is known as Group 2 or II on the modern periodic table. This group includes the elements Beryllium (Be), Magnesium (Mg), Calcium (Ca), Strontium (Sr), Barium (Ba), and Radium (Ra). These elements share similar properties such as they are all shiny, silvery-white and they are all reactive, but not as much as alkali metals in Group 1. They also have two electrons in their outer shell, therefore, they are eager to lose those electrons in order to reach a stable electron configuration.

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The answer is Agriculture

The leading source of pollutants found in rivers surveyed for the 1998 report that you read was; Agriculture.

The National Water Quality Inventory Report to Congress in 1998 was one that summarized information reported by the states in that same year by describing the condition of their waters that were accessed as it was required under Section 305(b) of the Clean Water Act.

The report had many sections such as;

Monitoring and Assessment

- Rivers and Streams

- Lakes, Ponds, and Reservoirs

- Coastal Resources - Tidal Estuaries, Shoreline Waters, and Coral Reefs

- Wetlands

- Ground Water Quality

- Public Health and Aquatic Life concerns

- Costs and Benefits of Water Quality Protection

Now, from the report as seen online, it was discovered that the leading source of pollutants found in rivers is Agriculture.

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Answer:

The correct answers are given below

Explanation:

1 An increase of one in atomic number and no change in the mass number.

2 All the above statements are correct.

3  A decrease of one in atomic number and a decrease of four in mass number.

4 Have a high neutron to proton ratio.