A molecule is 85. 7% C and 14. 3% H by mass. Determine its emperical formula

Answer:

silicon

Explanation:

the 14th element in the periodic table of elements.

The element number 14 on the periodic table is silicon (Si).

Silicon is a chemical element with atomic number 14 and symbol Si. It is a metalloid and a member of the carbon group, located in Group 14 of the periodic table.

Silicon is the second most abundant element on Earth's crust, and it is widely used in various industries, especially in electronics and semiconductors. It is a crucial component in the production of computer chips, solar cells, and other technological applications. Silicon is known for its semiconducting properties, making it a fundamental element in modern technology.

Read more about silicon here:

https://brainly.com/question/2053871

#SPJ6

Answer:

A. A as concentration decreases.

Explanation:

A represents a reactant and B is a product, the concentration of the latter increases at the expense of the concentration of the former. Hence, A is the reactant of the chemical reaction as its concentration decreases.

For each of the given salt preparations, the method and additional reagent needed for the preparation as well as the complete equation of the reaction is given below:

(i) The soluble salt copper (II) sulfate, from the insoluble base, copper (II) oxide:

Method: add an excess of base or metal to dilute acid and remove the excess by filtration

Reagent: copper (ii) oxide and sulfuric acid

Word equation: copper (ii) oxide + sulfuric acid --> copper (ii) sulfate + water

(ii) The soluble salt, potassium chloride, from soluble base potassium hydroxide;

Method: use a burette and indicator;

Reagent: potassium hydroxide and hydrochloric acid

Symbol equation: KOH + HCl ---> HCl + H₂O

Salts are compounds that are formed when all or some of the ionizable hydrogen of acids are replaced by metallic ions.

Depending on the nature and solubility of a salt, there are three methods of preparing salts.

Method A-- use a burette and indicator; for soluble salts

Method B----mix two solutions and obtain the salt by precipitation; for insoluble salts

Method C-  add an excess of base or metal to dilute acid and remove the excess by filtration; for soluble salts.

Learn more about soluble and insoluble salts at:  https://brainly.com/question/15596863

#SPJ1

Answer:

Porque las moléculas de glucosa son salvajes

Explanation:

Answer:

Glucose cannot move across a cell membrane via simple diffusion because it is simple large and is directly rejected by the hydrophobic tails. Instead it passes across via facilitated diffusion which involves molecules moving through the membrane by passing through channel proteins.

Explanation:

Answer:

Number 2 is Direction

Explanation:

The old answer for number four was incorrect

I apologize for the inconvenience but I do not have an answer that fits in the lines for number 4

If equal masses of He and Ne are placed in a sealed container, the partial pressure of He in the container would be 3 atm, as the total pressure is 6 atm and the partial pressure of Ne would be 3 atm as well.

The partial pressure of a gas in a container is determined by the amount of the gas present in the container and its temperature. In a sealed container, the amount of gas present is fixed, so the pressure of each gas is determined solely by its temperature. In the case of equal amounts of He and Ne, the partial pressure of He would be equal to the partial pressure of Ne, resulting in a total pressure of 6 atm.

Learn more about The partial pressure of a gas :

https://brainly.com/question/16118479

#SPJ4

2.62J of energy will be required to warm a silver metal from a temperature of 25°C to 27.5°C.

The energy required in a calorimetry can be calculated using the following formula:

Q = m × c × ∆T

Where;

According to this question, 4.37 g of silver should be heated from 25°C to 27.5°C. The heat required is as follows:

Q = 4.37 × 0.24 × (27.5 - 25)

Q = 1.0488 × 2.5

Q = 2.62J

Therefore, 2.62J of energy will be required to warm a silver metal from a temperature of 25°C to 27.5°C.

Learn more about energy at: https://brainly.com/question/1932868

Answer:

n=N/NA

n= 3.754×10²³/6.02×10²³

n= 6.24 s

Explanation

since there is number of molecules, make use of Avogadro's constant to get number of moles.

From the problem, we know that:

The half-life of the nuclide is 30 years.

The time that we're going to study are 120 years.

The first thing we need to do is to find the number of half-lives that has elapsed (n). To do this, we divide the time studied by the half life:

How to determine the original mass?

We know that the amount remaining (N) is = 4.1g and the number of half-lives (n) = 4. To find the original amount (No), what we do is to use the following equation:

The original mass of Cs-131 sample was 65.6 grams.

To write a balanced chemical equation for a double displacement reaction, we need to know the reactants involved. In this case, we have two solutions that will undergo a reaction.  Let's say we have solution A and solution B. To write the equation, we need to know the compounds present in each solution.

In this reaction, the silver ion (Ag+) from silver nitrate combines with the chloride ion (Cl-) from sodium chloride to form silver chloride (AgCl), which is a solid precipitate. The sodium ion (Na+) from sodium chloride combines with the nitrate ion (NO3-) from silver nitrate to form sodium nitrate (NaNO3), which remains in the aqueous state.

It's important to note that the states of matter can vary depending on the specific compounds involved in the reaction. Always check the solubility rules to determine whether a precipitate forms or if the compounds remain in the aqueous state.

To know more about displacement reaction visit :-

https://brainly.com/question/29794138

#SPJ11

The concentration of sulfuric acid that remains after neutralization is 0.056 M.

To find out what concentration of sulfuric acid remains after neutralization, you will need to use the balanced equation for the reaction:

H2SO4 + 2KOH → K2SO4 + 2H2O

First, you will need to determine the moles of each reactant in the solution.

Moles can be determined using the formula:

moles = concentration x volume

In this case:

moles of H2SO4 = 0.850 L x 0.400 M = 0.34 mol

moles of KOH = 0.800 L x 0.250 M = 0.2 mol

Since the reaction is a 1:2 ratio, you will need to determine which reactant is limiting the reaction.

To do this, compare the mole ratios of the reactants:

0.34 mol H2SO4 : 0.2 mol KOH = 1.7 : 1

Since the ratio of H2SO4 to KOH is greater than 1:2, KOH is the limiting reactant. Therefore, all of the KOH is used up in the reaction, leaving some H2SO4 unreacted.

To find the amount of H2SO4 remaining, you will need to use the mole ratio of H2SO4 to KOH.

Since 2 moles of KOH react with 1 mole of H2SO4, you can use the mole ratio:

0.2 mol KOH x (1 mol H2SO4 / 2 mol KOH) = 0.1 mol H2SO4 remaining

Finally, you can determine the concentration of the H2SO4 remaining:

concentration = moles / volume

concentration = 0.1 mol / (0.850 L + 0.800 L)

concentration = 0.056 M

Therefore, the concentration of sulfuric acid that remains after neutralization is 0.056 M.

For more such questions on concentration, click on:

https://brainly.com/question/28564792

#SPJ11

Answer: D

Explanation:

The expected hybridization of the central atom for the following molecules or ions.

(a) \(NO^{3-}\)= \(sp^2\)

(b) \(CCl_4\) = \(sp^3\)

(c) \(NCl_3\) = \(sp^3\)

(d) \(NO^{2-}\) = \(sp^2\)

(a) The central atom in \(NO^{3-}\) is nitrogen, which has a total of 5 valence electrons. To form the three N-O bonds, nitrogen uses three of its valence electrons, and there is one lone pair left. Therefore, the expected hybridization of the central atom is \(sp^2\).

(b) The central atom in \(CCl_4\) is carbon, which has a total of 4 valence electrons. To form the four C-Cl bonds, carbon uses all of its valence electrons, and there are no lone pairs left. Therefore, the expected hybridization of the central atom is \(sp^3\).

(c) The central atom in \(NCl_3\) is nitrogen, which has a total of 5 valence electrons. To form the three N-Cl bonds, nitrogen uses three of its valence electrons, and there is one lone pair left. Therefore, the expected hybridization of the central atom is \(sp^3\).

(d) The central atom in \(NO^{2-}\) is nitrogen, which has a total of 5 valence electrons. To form the two N-O bonds, nitrogen uses two of its valence electrons, and there are two lone pairs left. Therefore, the expected hybridization of the central atom is \(sp^2\).

For more question on hybridization click on

https://brainly.com/question/14358519

#SPJ11

Physical chemistry a  major branch of chemistry would be most concerned with studying a series of chemical reactions in order to measure the amount of heat being released in each one.

For more information on  chemistry kindly visit to

https://brainly.com/question/13428382

#SPJ1

Answer:i dont know thats why imon her

Explanation:

Answer:

134K

Explanation:

Using the ideal gas law equation;

PV = nRT

Where;

P = pressure (atm)

V = volume (Litres)

n = number of moles (mol)

R = gas constant (0.0821 Latm/Kmol)

T = temperature (K)

Based on the information provided, n = 1.4moles, P = 3.25atm, V = 4.738L, T = ?

3.25 × 4.738 = 1.4 × 0.0821 × T

15.3985 = 0.11494T

T = 15.3985/0.11494

T = 133.969

Approximately;

T = 134K

Answer:

Ammonia is limiting reactant

Amount of oxygen left  = 0.035 mol

Explanation:

Given data:

Masa of ammonia = 2.00 g

Mass of oxygen = 4.00 g

Which is limiting reactant = ?

Excess reactant's amount left = ?

Solution:

Balance chemical equation:

4NH₃ + 3O₂     →     2N₂ + 6H₂O

Number of moles of ammonia:

Number of moles = mass/molar mass

Number of moles = 2.00 g/ 17 g/mol

Number of moles = 0.12 mol

Number of moles of oxygen:

Number of moles = mass/molar mass

Number of moles = 4.00 g/ 32 g/mol

Number of moles = 0.125 mol

Now we will compare the moles of ammonia and oxygen with water and nitrogen.

                       NH₃          :            N₂

                         4             :             2

                       0.12           :           2/4×0.12 = 0.06

                       NH₃         :            H₂O

                         4            :             6

                         0.12       :           6/4×0.12 = 0.18

                        O₂            :            N₂

                         3             :             2

                       0.125        :           2/3×0.125 = 0.08

                         O₂           :            H₂O

                         3              :             6

                         0.125       :           6/3×0.125 = 0.25

The number of moles of water and nitrogen formed by ammonia are less thus ammonia will be limiting reactant.

Amount of oxygen left:

                         NH₃          :             O₂

                            4            :              3

                            0.12       :          3/4×0.12= 0.09

Amount of oxygen react = 0.09 mol

Amount of oxygen left  = 0.125 - 0.09 = 0.035 mol

Answer:

Answer:

The correct formula is...

Nal

Answer:

-173.5°F

Explanation:

such a weird question lol

Answer:

Explanation:

What is the melting and boiling point of alcohol?

For example, ethanol, with a molecular weight (MW) of 46, has a boiling point of 78 °C (173 °F), whereas propane (MW 44) has a boiling point of −42 °C (−44 °F).

Answer:

it is 12

Explanation:

because matter can put be created or destroyed

In a redox reaction, reduction means gain of electrons, and oxidation means loss of electrons.

Redox reactions, also known as oxidation-reduction reactions, include reactions in which there is a transfer of electrons between atoms or ions. In such a reaction, there are two half-reactions, one for oxidation and one for reduction. Oxidation is the process in which an atom or ion loses electrons, resulting in an increase in oxidation state, while reduction is the process in which an atom or ion gains electrons, resulting in a decrease in oxidation state.

In simpler terms, reduction means gain of electrons, while oxidation means loss of electrons. For instance, if zinc oxide is reduced with carbon, carbon is oxidized as it gains oxygen and zinc is reduced as it loses oxygen. The reaction can be represented by the following half-reactions:

ZnO → Zn + O₂ (reduction)

C + O₂ → CO₂ (oxidation)

Hence, zinc oxide is reduced while carbon is oxidized.

Learn more about Redox reactions here:

https://brainly.com/question/28300253

#SPJ11

At room temperature, the reaction with the fastest reaction rate would likely be option 3) N2(g) + 2O2(g) --> 2NO2. This is because this reaction involves the breaking of a relatively weak triple bond between the two nitrogen atoms, allowing them to form bonds with oxygen atoms to create NO2 molecules.

In contrast, options 1) and 2) involve the formation of relatively strong covalent bonds, which would require more energy to break and therefore have slower reaction rates. Option 4) involves the decomposition of KClO3, which requires a high activation energy to break the bond between the K and ClO3 ions, and so would also have a slower reaction rate than option 3).

To know more about room temperature click this link -

brainly.com/question/8739174

#SPJ11

The equation is 2N2 + H2 → 3NH3 ,2 upper case N subscript 2 end subscript plus upper case H subscript 2 end subscript rightward arrow 3 upper case N H subscript 3 end subscript.

A chemical equation that is balanced conserves mass and has an equal number of atoms of each element on both sides of the equation.

A chemical equation that is balanced has equal masses for the reactants and products, contains the same amount of atoms of each element on both sides of the equation.

Equal numbers of atoms from various elements are present in both the reactants and the products in balanced chemical equations. Different elements' atom counts in the reactants and products of unbalanced chemical equations are different.

To learn more about Balanced equation refer to :

https://brainly.com/question/26694427

#SPJ1

The statement that is NOT true about diazonium salts is option C, which says that aryldiazonium salts are moderately stable in water at 0 °C because the system of the aromatic ring stabilizes the п system of the N2+, the diazonium ion.

In reality, diazonium salts are highly reactive compounds that can easily undergo hydrolysis, which results in the release of nitrogen gas and the formation of an aryl or alkyl cation. Therefore, it is important to suppress the hydrolysis of diazonium salts during diazotization and coupling reactions.

Aryldiazonium salts are commonly used in the synthesis of commercially available dyes through coupling reactions with activated aromatic compounds. These salts are relatively stable and can be stored at low temperatures, but they should still be handled with caution because they can be explosive under certain conditions.

On the other hand, alkyl diazonium salts are highly unstable and are likely to decompose when exposed to heat, light, or moisture. This is because N2 is far more stable than R-N2, where R is an alkyl group. When alkyl diazonium salts decompose, they can give a variety of products, including alkenes, alkanes, and alkyl radicals.

In summary, diazonium salts are important intermediates in organic synthesis, but they are highly reactive and should be handled with care. Diazotization and coupling reactions must be performed under controlled conditions to prevent hydrolysis and other side reactions. Aryldiazonium salts are more stable than alkyl diazonium salts, but both types of compounds require careful handling and storage.

You can learn more about diazonium salts at: brainly.com/question/30883037

#SPJ11

A compound always has a chemical formula that remains the same, distinguishing it from a mixture. The chemical formula of a compound represents the fixed ratio and types of elements present within it.

A compound is formed through a chemical reaction where different elements combine in a specific ratio to create a new substance with distinct properties. The resulting compound has a consistent chemical formula that represents the elemental composition of the compound. This formula remains the same regardless of the source or quantity of the compound.

For example, water (H2O) is a compound with a fixed ratio of two hydrogen atoms to one oxygen atom. It will always have this ratio, whether it is derived from a natural source or synthesized in a laboratory. On the other hand, a mixture is a physical combination of substances without undergoing a chemical reaction.

Mixtures can have varying compositions and can be separated into their individual components through physical means such as filtration or distillation. Unlike compounds, mixtures do not have a fixed chemical formula and can exhibit different properties depending on the relative amounts of the substances involved.

To learn more about distillation, click here: brainly.com/question/31829945

#SPJ11

Answer:

pH = 13.41

Explanation:

You can calculate the pH using the following formula:

pH + pOH = 14

You can plug the given pOH into the equation and simplify to find the pH.

pH + pOH = 14

pH + 0.59 = 14

pH = 13.41

33.0 mol of KClO3 are totally consumed, approximately 49.5 moles of O2 will be formed.

To determine the number of moles of O2 formed when 33.0 mol of KClO3 are consumed, we can use the balanced equation for the reaction:

2KClO3 → 2KCl + 3O2

From the balanced equation, we can see that the stoichiometric ratio between KClO3 and O2 is 2:3. This means that for every 2 moles of KClO3 consumed, 3 moles of O2 are formed.

Given that we have 33.0 mol of KClO3, we can set up a proportion to find the number of moles of O2 formed:

(33.0 mol KClO3) x (3 mol O2 / 2 mol KClO3) = 49.5 mol O2

For more such questions on moles

https://brainly.com/question/30337257

#SPJ11