how does elemt's atomic mass differ from its mass number?

The simplest alkyne chemical molecule, known as acetylene chemically, is C2H2. Ethyne, Narcy Len, and Vinylene are other names for acetylene.

Two. C2H2 molecules contain 2 carbon atoms each. As a result, there are 2 moles of carbon atoms in every mole of C2H2. You may determine how many moles of an element there are in one mole of a compound by looking at the subscripts in any formula.

The C2H2 chemical formula

Acetylene has the extended chemical formula CHCH and the chemical formula C2H2. Acetylenes' molar mass can be expressed as 26.04 g/mol-1.

Grams Acetylene = 46.60673120000018

Mol = 1.79.

C2H2 molecule

Acetylene, C2H2 / Formula is below.

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Considering the definition of empirical formula, the empirical formula for the compound is Fe₃PO₄.

The empirical formula is the simplest expression to represent a chemical compound, which indicates the elements that are present and the minimum proportion in whole numbers that exist between its atoms.

In this case, in first place you need to convert the number of grams given into percentage as follow:

Assuming a 100 grams sample, the percentages match the grams in the sample. So you have 63.81 grams of iron, 11.81 grams of phosphorus and 24.38 grams of oxygen.

Then it is possible to calculate the number of moles of each atom in the molecule, taking into account the corresponding molar mass:

The empirical formula must be expressed using whole number relationships, for this the numbers of moles are divided by the smallest result of those obtained. In this case:

Iron (Fe): 1.14 moles÷ 0.38 moles= 3

Phosphorus (P): 0.38 moles÷ 0.38 moles= 1

Oxygen (O): 1.52 moles÷ 0.38 moles= 4

Therefore the Fe: P: O mole ratio is 3: 1: 4

Finally, the empirical formula is Fe₃P₁O₄= Fe₃PO₄.

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Explanation:

Le Chatelier's principle states that if a dynamic equilibrium system is disturbed by changing for example pressure, temperature, or concentration of products or reactants, the equilibrium will shift in the opposite direction to offset the change.

----

An example to understand better this principle:

Given a general reaction in equilibrium:

A (g) + B (g) <=> C (g) + D (g) ΔH < 0 (it means an exothermic reaction)

This reaction can be seen as follows:

A (g) + B (g) <=> C (g) + D (g) + energy (exothermic reaction = releases energy)

If the temperature increases or heat is added, the equilibrium will shift to the left because of the principle. (There are many examples)

The number of hours left for the fourth employee to complete would be 80 hours.

The total number of hours to complete the entire project = 300 hours.

The first employee completes one-third of the project:

1/3 x 300 = 100 hours.

The remaining hours would be: 300 - 100 = 200 hours.

Now, the second employee completes one-fifth of the work remaining:

1/5 x 200 = 40 hours.

200 - 40 = 160 hours.

A total of 160 remain after the 2 employees have completed their work.

Now, the third employee completes one-half of the remaining work:

1/2 x 160 = 80 hours.

The total number of hours left for the fourth employee to complete is, therefore, 80 hours.

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The element in period 3 that has the greatest tendency to lose an electron is Sodium (Na)

Sodium is the first element in the period 3. In the periodic table, atomic size or atomic radius decreases from left to right.

We know that, higher the atomic radius higher the tendency to lose an electron by the element.  In addition to that, sodium has only one valence electron in their outermost orbitals which would be easily lost to attain a stable state.

Thus, Sodium (Na) with higher atomic radius in period 3 and one valence electron in their outermost orbitals would have the higher tendency to lose an electron.

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A gram of NaOH required to neutralize 700 ml HCL is 84 grams.

Neutralization or neutralization is a chemical response in which an acid and a base react quantitatively with each different. I

Moles of solute = Molarity × Liters of solution

                           = 3 × 0.7 L

                          = 2.1 mole

The molar mass of NaOH = 40

mass of NaOH = 40 × 2.1 g

                        = 84 gram.

A neutralization response may be described as a chemical reaction in which an acid and base quantitatively react together to shape salt and water as products. In a neutralization response, there's a combination of H+ ions and OH– ions that form water.

A neutralization response is when an acid and a base react to shape water and salt and includes the mixture of H+ ions and OH- ions to generate water. The neutralization of a sturdy acid and robust base has a pH equal to 7.

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Answer:

Option B.

Explanation:

The formula of the Kb is written by dividing with the multiplication of the concentration of the products in the numerator, and the multiplication of the concentration of the reactants in the denominator:

The first step to solve this question is to write and balance the chemical equation that describes the reaction:

According to the given information the limiting reactant is NaCl, this is because 9 moles of this reactant react with 3 moles of Al(NO₃)₃.

Use this information to find the maximum amount of NaNO₃ that was produced:

It means that 9 moles of NaNO₃ are produced.

Set up:

Na2CO3 + 2 HCL ------> 2 NaCl + H2O + CO2

105.99

According to the given table, the last three spaces in "Calculate constant PV" are:

We will plot a graph using the values of volume in the x axis, and the values of pressure in the y axis. Once we plot each of the points, we will obtain this graph:

366373838384774738393

Explanation:

267277777727777525256 ;)

Answer:

The Sun is a star.

Explanation:

Answer:

sound and sunlight are not considered matter but, the rest is matter

Explanation:

The two actions that are examples of science influencing technology are:

A) Using the internet to publish and share new scientific discoveries.

D) Using observations about plant seed structures to develop hook-and-loop fasteners. Option A and D

These examples illustrate how scientific advancements and knowledge have influenced the development and application of technology.

Using the internet to publish and share new scientific discoveries is a prime example of science influencing technology. The internet has revolutionized the way scientific information is disseminated, allowing researchers to publish their findings rapidly and share them globally.

This has facilitated collaboration, accelerated the spread of scientific knowledge, and enhanced the efficiency of scientific communication. The internet has also given rise to platforms for open-access journals and online scientific communities, enabling greater accessibility and the democratization of scientific information.

Using observations about plant seed structures to develop hook-and-loop fasteners is another instance of science influencing technology. Scientists studying the natural world have observed the mechanisms by which certain plants disperse their seeds.

One such example is the observation of burrs or burdock plants that use tiny hooks to attach to animal fur or clothing. Inspired by these observations, scientists developed hook-and-loop fasteners, commonly known as Velcro, which mimics the natural hooking mechanism of the plant seeds.

This technology has found widespread applications in various fields, including clothing, aerospace, and medicine, offering a versatile and efficient fastening solution.

These examples highlight the reciprocal relationship between science and technology, where scientific discoveries and knowledge contribute to technological advancements, while technological developments, in turn, provide new tools and capabilities for scientific research and exploration.

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When we use an equation for stoichiometry, it has to be balanced.

The given equation:

Is already balanced, because there are 2 N on both the left and right sides and 6 H on both the left and the right sides.

So, we can skip the balancing.

Now, we can use the coefficients on the involved compounds to calculate the quantity we want.

We have:

Number of moles of H₂: ?

Coefficient of H₂: 3

Number of moles of NH₃: 5 mol

Coefficient of NH₃: 2

So, we can apply the rule of three:

H₂ ---- NH₃

x ---- 5 mol

3 ---- 2

So, we can write the relation:

So, we need 7.5 mol of hydrogen gas.

Answer:

4 electrons were gained

Explanation:

Here, we want to get the number of electrons gained or lost

From what we have, there was a change from a positive value to a negative one

Since electrons are negatively charged entities, it means that the nitrogen atoms gained electrons.

For the change to have occurred, there must have been a matching of two electrons initially, then another two electrons

Thus, we have the total number of electrons gained as 4

The equilibrium pressure of NO in the reaction is 2.88 atm .

Equilibrium constant is defined as a number that expresses the proportion of products and reactants present at equilibrium.

The equilibrium constant can also be defined as a numerical value that indicates how much reactant is converted into product.

Given Kp = 1.11 x 10⁻⁵

T = 200 °C

V = 2.5 L

P = 2.50 atm

Considering the equation;

[tex]\rm 2 NO_2(g) \rightarrow 2 NO(g) + O_2(g)[/tex]

2 NO₂ = 2.5-2x

2 NO = 2x

O₂ = x

Kp = [P(NO)]² x P(O₂) / P(NO₂)

1.11 x 10⁻⁵ = (2x)² x (x) / (2.5 - 2x)²

1.11 x 10⁻⁵ = 4x³ / (0.5)²

1.11 x 10⁻⁵ = 4x³ / 0.25

4x³ = 0.2775

x³ = 0.0694

x = 1.44

Pressure of NO = 2 x 1.44

                          = 2.88 atm

Thus, the equilibrium pressure of NO in the reaction is 2.88 atm .

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Equilibrium constant is the only concept that is to be used here to calculate partial pressure of NO. The partial pressure of Nitrogen comes out to be  0.0083atm.

Equilibrium constant is a rate constant at equilibrium shows the values of reaction with respect to the pressure and concentration

[tex]K_{p} =\frac{[partial pressure of NO]^{2} [partial pressure of O_{2}] }{[partial pressure of NO_{2} ]^{2} }[/tex]

substituting the given values in the questions

1.11 × 10⁻⁵×(2.50atm)²=      [partial pressure of NO}²

6.93×10⁻⁵atm²=  [partial pressure of NO}²

0.0083atm  =partial pressure of NO

Thus the pressure of NO in is 0.0083atm

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Answer:

C

Explanation:

Indentured servants worked to pay off a debt and were released after a certain amount of time as the debt has been payed off

DNA has a double helix structure, which is basically two chains of nucleotides that are bonded by hydrogen bonds.

It means that the correct answer is double helix.

B < Na < Al < K

The size of elements in the periodic table increases from right to left and top to bottom down the group.

For the given question, we will arrange the elements based on atomic size.

For the given elements

• Aluminum has an atomic number of 13

• Boron has an atomic number of 5

• Potassium has an atomic number of 19

• Sodium has an atomic number of 11.

The increasing size will be based on their increasing atomic number and position in the periodic table.

The required increasing size will be B < Na < Al < K

Answer:

Exothermic reaction.

Explanation:

Since the products end up having a lower energy than the reactants, that means that the reaction is exothermic. It also means that this reaction released energy.

1.94 moles of 35 grams of ice (H₂O).

18 g of ice = 1mol.

Therefore,

35 grams of ice  = 35/18

35 grams of ice  = 1.94 moles.

Molar mass (M) is a physical property defined as the mass of a certain element or molecule per mole of  substance. Since a mole is defined as the amount of a substance and substances have different masses, each element or molecule has a different molar mass. For example, if one has a dozen bricks and the other has a dozen feathers, they have the same amount of matter but very different total masses.

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Elements do emit photons on those colors when electrons decay to a ground level orbit then the each element will produce its own set of color

Photon is the tiny particle of electromagnetic radiation

Light travels as discrete packets of light called photons and each photon will be carrying a certain amount of energy then the energy carried within a photon determines then what color it is with blue photons having about twice the energy as red photon and the fact are given below

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Answer

pOH = 4.1

Explanation

Given:

pH = 9.9

Required: The concentration of OH-

Solution

pH + pOH = 14

9.9 + pOH = 14

pOH = 14-9.9

pOH = 4.1

Answer:

Explanation:

Here, we want to get a tentative law from the given measurements

To get the correct options, we have to look at the values

Let us take a look at the options one after the other

a) Mass of gas is inversely proportional to the volume

What this mean is that as the mass of gas increase, the volume should decrease. Or as the mass decrease,the volume increase

Now, let us take a look at the values:

As mass increases from top to bottom, the volume also increases

This mean the law cannot be correct. This option is incorrect

b) Mass to volume ratio of a gas is constant

To check for this, we have to divide the mass by the volume for all the pairs

We can check for this as follows:

i) 22.5/1.6 = 14.0625

ii) 35.8/2.55 = 14.039

iii) 70.2/5 = 14.04

iv) 98.5/7.01 = 14.05

Looking at all the values, we can see that if we rounded them to the same whole number, we have 14 all through. That means the law is correct

This option is correct and should be selected

c) The mass of a gas is directly proportional to its volume

This is the direct opposite of the first option

We can see that as the mass increases,the volume also increases.That makes this option a correct one.

The option is correct and should be selected

d) The mass-to-volume ratio of a gas isn't constant

This is the opposite to the second option. We have proved and seen that the mass to volume ratio is constant.

This option is not correct and should not be selected

Answer: it is 800

Explanation:

strontium sulfate is WHITE CRYSTALLINE POWDER WITHOUT A SMELL. heating steadily above 1580°C causes decomposition. Sulfur oxides and other harmful and corrosive gases are produced as a result.

Sr(NO3)2 + H2SO4 -> 2HNO3 + SrSO4 is molecular equation

SrSO4 ( strontium sulfate will precipitate )

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The most important thing to remember about tritium sights is that they gradually lose their effectiveness over time. Tritium has a half-life of about 12.5 years, so tritium sights will only be half as bright in a little more than a decade.

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-270.16kJ

The formula for calculating the mole of a compound is expressed as:

Determine the mole of 43g of CH3OH

If the heat of formation of 1 mol of CH3OH is -201.3KJ, the amount of heat formed by 1.342moles of the same compound is given as:

Therefore -270.16kJ heat is exchanged when 43g are formed'