a 3.59 g sample of a laboratory solution contains 1.39 g of acid. what is the concentration of the solution as a mass percentage?

2.50 g of helium gas at STP would occupy a volume of 14.0 liters.

Standard temperature and pressure (STP) conditions of 0°C and 1 atm, we can use the molar volume of a gas at STP, which is 22.4 L/mol.

1. Helium seems to have a molar mass of 4.00 g/mol.

Therefore, we can calculate the number of moles of helium as:

moles of He = mass of He divided by molar mass of He

= 2.50 g / 4.00 g/mol

= 0.625 mol

Then, we can use the molar volume of a gas at STP to calculate the volume of helium gas:

volume of He = moles of He x molar volume of gas at STP

= 0.625 mol x 22.4 L/mol

= 14.0 L

2.50 g of helium gas at STP would occupy a volume of 14.0 liters.

2. The molar mass of sodium is 22.99 g/mol. Therefore, we can calculate the number of moles of sodium as:

moles of Na = number of atoms of Na divided by Avogadro's number

= 5.0 x 10²⁵ atoms / 6.022 x 10²³ atoms/mol

= 83.0 mol

Then, we can use the molar mass of sodium to calculate the mass of sodium:

mass of Na = moles of Na x molar mass of Na

= 83.0 mol x 22.99 g/mol

= 1900 g

Therefore, 5.0 x 10²⁵ atoms of sodium have a mass of 1900 g.

3. The molar mass of Ni is 58.69 g/mol. Therefore, we can calculate the number of moles of Ni as:

moles of Ni = mass of Ni divided by molar mass of Ni

= 3.95 g / 58.69 g/mol

= 0.0673 mol

Then, we can use Avogadro's number to calculate the number of atoms of Ni:

number of atoms of Ni = moles of Ni x Avogadro's number

= 0.0673 mol x 6.022 x 10²³ atoms/mol

= 4.05 x 10²² atoms

Therefore, 3.95 g of Ni contain 4.05 x 10²² atoms.

4. The molar mass of Xe is 131.29 g/mol. Therefore, we can calculate the number of moles of Xe as:

moles of Xe = mass of Xe divided by molar mass of Xe

= 15 kg / 131.29 g/mol

= 114 mol

Then, we can use Avogadro's number to calculate the number of atoms of Xe:

number of atoms of Xe = moles of Xe x Avogadro's number

= 114 mol x 6.022 x 10^23 atoms/mol

= 6.87 x10²⁵ atoms

Therefore, a 15 kg sample of Xe gas contains 6.87 x 10²⁵ atoms.

5. A gas's molar volume at STP is 22.4 L/mol. Therefore, we can calculate the number of moles of Ar as:

moles of Ar = number of atoms of Ar divided by Avogadro's number

= 45,000,000 atoms / 6.022 x 10²³ atoms/mol

= 7.47 x 10⁻¹⁷ mol

Then, we can use the molar volume of a gas at STP to calculate the volume of Ar gas:

volume of Ar = moles of Ar x molar volume of gas at STP

= 7.47 x 10⁻¹⁷ mol x 22.4 L/mol

= 1.67 x  10⁻¹⁵ L

Therefore, 45,000,000 atoms of Ar would occupy a volume of 1.67 x 10⁻¹⁵ liters at STP.

6. The molar mass of CO₂ is 44.01 g/mol. Therefore, we can calculate the number of moles of CO₂ as:

moles of CO₂ = mass of CO₂ divided by molar mass of CO₂

= 75 g / 44.01 g/mol

= 1.70 mol

Then, we can use Avogadro's number to calculate the number of atoms of CO₂:

number of atoms of CO₂ = moles of CO₂ x Avogadro's number

= 1.70 mol x 6.022 x 10²³ atoms/mol

= 1.02 x 10²⁴ atoms

Therefore, a 75 g sample of CO₂ contains 1.02 x 10²⁴ atoms.

To know more about STP, visit:

https://brainly.com/question/29356493

#SPJ1

Answer:

nervous system- sends signals to the brain

respiratory system- sends oxygen to the body

The car speed : 204.545 miles/h

Given

The speed of the car = 300 ft/s

Required

Speed in miles/hour

Solution

In converting units we must determine the conversion factor

Conversion factors for miles and hour :

1 mile = 5,280 feet

1 ft = 0,000189394 mile

1 hours = 3,600 s

So for 300 ft/s to miles/hour :

= 300 ft/s x 3600 s/hr x 0,000189394 mile/ft

= 204.545 miles/h

Based on the mole ratio, the number of moles of Al required to produce 35.2 g of AlBr₃ is 0.13 moles.

The mole ratio of the reaction is the ratio in which moles of reactants combine to form moles of product.

The mole ratio is obtained from the equation of the reaction.

Considering the given reaction equation below:

Al(s) + 3 Br₂(l) → 2 AlBr₃(s)

1 mole of Al produces 2 moles of AlBr₃ when reacted with 3 moles of Br₂

Molar mass of AlBr₃ = 267 g

Molar mass of Al = 27 g

Moles of Al required to produce 35.2 g of AlBr₃ = 35.2 * 27/267 * 1 mole/27

Moles of Al required to produce 35.2 g of AlBr₃ = 0.13 moles of Al

Learn more about mole ratio at: https://brainly.com/question/26023

#SPJ1

Answer:

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

\(volume = \frac{mass}{density} \\\)

From the question

mass = 5000 g

density of copper = 8.94 g/mL

We have

\(volume = \frac{5000}{8.94} \\ = 559.2841163...\)

We have the final answer as

Hope this helps you

Answer:

\(107pg = 107 \times {10}^{ - 12}g =1.07 \times {10}^{ - 10} g\\ because \: pico, \: p = {10}^{ - 12} .\)

Answer:

Buffalo and Watertown.

Explanation:

This is correct as the Interior lowlands are located ib the US. These are correct as the others are in the US but aren't located anywhere near the Interior Lowlands.

Answer; the answer is variations

The unit of genetic material that determines how living things look is called variations, look below for more description.

Hereditary variety alludes to contrasts among the genomes of individuals from similar species. A genome is all the innate data — every one of the qualities — of a creature. Hereditary variety is the distinction in DNA successions between people inside a populace.

For example, the human genome contains somewhere close to twenty and 25 thousand qualities.

Find more information about Genetic variations here:

brainly.com/question/14926046

Answer:

iris is what controls the amount of light  that enters the eye

Explanation:

Answer:

Iris

Explanation:

The Iris opens and closes to control the amount of light entering the eye through the pupil.

The number of H atoms in 3(NH₄)₂CrO₄ = 24

The empirical formula is the smallest comparison of atoms of compound forming elements.  

A molecular formula is a formula that shows the number of atomic elements that make up a compound.  

(empirical formula) n = molecular formula  

Subscripts in the chemical formula indicate the number of atoms

The compound of 3(NH₄)₂CrO₄ ( 3 molecules of (NH₄)₂CrO₄ ) :

Number of H :

\(\tt 4\times 2(subscript)\times 3(coefficient,number~of~molecules)=24~atoms\)

The number of Hydrogen (H) atoms in the compound, 3(NH₄)₂CrO₄ is 1.44×10²⁵ atoms

From Avogadro's hypothesis,

1 mole of H = 6.02×10²³ atoms

Therefore,

24 moles of H = 24 × 6.02×10²³

24 moles of H = 1.44×10²⁵ atoms

Thus, the number of atoms of H in 3(NH₄)₂CrO₄ is 1.44×10²⁵ atoms

Learn more about Avogadro's number:

https://brainly.com/question/26141731

When atoms form chemical bonding then the atoms attain Noble gas configuration.

Noble gas configuration of an atom includes the fundamental image of the ultimate noble fueloline previous to that atom, observed via way of means of the configuration of the ultimate electrons.so for sodium, we make the substitution of [Ne] for the 1s22s22p6 a part of the configuration. Sodium's noble fueloline configuration becomes [Ne]3s1.

Covalent bonds, atoms percentage pairs of electrons, at the same time as in ionic bonds, electrons are absolutely transferred among atoms in order that ions are formed.During the formation of a chemical bond, the predicted end result is that the electrons will whole a noble fueloline configuration in each atoms. Typically, while atoms shape a chemical bond, the predicted end result is that the electrons.

Read more about atom:

https://brainly.com/question/621740

#SPJ4

Solution b has a hydronium ion concentration of 1.9 x 10-4m has has the greater hydronium ion concentration. The pH value increases with the concentration of hydronium ions in a solution.

Acidic chemicals result from high hydrogen ion concentrations, while alkaline substances come from low hydrogen ion concentrations (basic substances). The pH scale can be used to quantify the overall concentration of hydrogen ions, which is inversely related to pH. When an acid dissolves in water, the hydronium ion is always produced. Always interacting with the nearby water molecule to generate H3O+, the acid's H+. Consider the hydronium ion from the perspective of the proton (H+), which is another way to perceive it. Hydration is the process of adding water to something.

pH equals -log[H3O+]. The reverse of the mathematical method used to determine the pH can be used to determine the hydronium ion concentration from the pH.

Learn more about hydronium ion here:

brainly.com/question/14619642

#SPJ4

Answer:

1.03 mol of dihydrogen gas will evolve, with a volume slightly over

22.4 \(dm^{3}\) at STP.

Explanation:

Answer:

24.47 L

Explanation:

Using the general gas law equation:

PV = nRT

Where;

P = pressure (atm)

V = volume (L)

n = number of moles (mol)

R = 0.0821 Latm/molK

T = temperature (K)

According to the provided information in this question,

P = 1.0 atm

V = ?

n = 1 mol

T = 25°C = 25 + 273 = 298K

Using PV = nRT

V = nRT ÷ P

V = 1 × 0.0821 × 298 ÷ 1

V = 24.465 ÷ 1

V = 24.465

V = 24.47 L

The reactions produce a basic solution by generating hydroxide ions. Reactions a, b, c, and d produce a basic solution with the presence of hydroxide ions. Here are the reactions involving the given compounds with cold water:

a. Na(s) + H2O(l) → NaOH(aq) + H2(g)
b. NaH(s) + H2O(l) → NaOH(aq) + H2(g)
c. Na2O(s) + H2O(l) → 2NaOH(aq)
d. Mg(s) + 2H2O(l) → Mg(OH)2(aq) + H2(g)
e. Ni(s) + H2O(l) → No reaction

Now, let's analyze each reaction to see if it produces a basic solution:

a. Sodium (Na) reacts with water to form sodium hydroxide (NaOH), which releases hydroxide ions (OH-), making the solution basic.

b. Sodium hydride (NaH) reacts with water to form sodium hydroxide (NaOH), which releases hydroxide ions (OH-), making the solution basic.

c. Sodium oxide (Na2O) reacts with water to form sodium hydroxide (NaOH), which releases hydroxide ions (OH-), making the solution basic.

d. Magnesium (Mg) reacts with water to form magnesium hydroxide (Mg(OH)2), which releases hydroxide ions (OH-), making the solution basic.

e. Nickel (Ni) does not react with cold water, so there is no production of hydroxide ions and no change in the solution's pH.

to know more about basic solution refer here:

https://brainly.com/question/3595168#

#SPJ11

Sunflower oil can be seperated easily by decentation process.

What is decentation process?

Decantation is the process of removing the liquid layer at the top from the layer of solid or liquid below to separate liquid from solid and other immiscible (non-mixing) liquids. After pouring out the top layer, the mixture can be tilted to complete the process.

As an illustration, when water and oil are combined in a beaker, a distinct layer between the two liquids eventually forms, with the oil layer floating on top of the water layer.

Therefore, Sunflower oil can be seperated easily by decentation process.

To learn more about decentation process

Here: https://brainly.com/question/2264046

#SPJ4

The two-sided 95% confidence interval for the mean population concentration is 20.6605 ppm to 24.9395 ppm.

To build a two-sided 95% confidence interval for the mean population concentration of the toxin in the lake, we can use the sample mean and sample standard deviation.

First, we need to determine the critical value corresponding to a 95% confidence level. Since the sample size is relatively large (16), we can use the Z-distribution. The critical value for a two-sided 95% confidence interval is approximately ±1.96.

Next, we can calculate the margin of error by multiplying the critical value by the standard deviation of the sample mean. The standard deviation of the sample mean, also known as the standard error, is calculated by dividing the sample standard deviation by the square root of the sample size.

Margin of error = 1.96 * (sample standard deviation / sqrt(sample size))

Substituting the values given in the problem:

Margin of error = 1.96 * (4.3 / sqrt(16)) = 1.96 * (4.3 / 4) = 2.1395

Finally, we can construct the confidence interval by subtracting and adding the margin of error to the sample mean:

Lower bound = sample mean - margin of error = 22.8 - 2.1395 = 20.6605 ppm

Upper bound = sample mean + margin of error = 22.8 + 2.1395 = 24.9395 ppm

Therefore, the two-sided 95% confidence interval for the mean population concentration of the toxin in the lake is approximately 20.6605 ppm to 24.9395 ppm.

Learn more about Confidence interval

brainly.com/question/32546207

#SPJ11

To determine the number of moles of hydrogen needed to crack one mole of the long saturated hydrocarbon chain (C40H82), we can analyze the reactants and products involved in the cracking reaction.

The cracking reaction is given as: C40H82 -> 3 C8H18 + n C2H6. From the equation, we can see that one mole of the long hydrocarbon chain (C40H82) produces three moles of octane (C8H18) and n moles of ethane (C2H6). Since the cracking process involves breaking the carbon-carbon bonds and forming new carbon-hydrogen bonds, the number of hydrogen atoms in the products should remain the same as in the reactant.

The long hydrocarbon chain (C40H82) contains 82 hydrogen atoms, and the products, 3 moles of octane (C8H18), contain (3 moles) * (18 hydrogen atoms/mole) = 54 hydrogen atoms. Therefore, the number of moles of hydrogen needed for cracking one mole of the long hydrocarbon chain can be calculated as: Number of moles of hydrogen = 82 - 54 = 28 moles. Hence, 28 moles of hydrogen are required to crack one mole of the long saturated hydrocarbon chain (C40H82).

To learn more about number of moles click here: brainly.com/question/20370047

#SPJ11

Answer:

A circut is comepleted

Explanation:

The bulb light when the needle touches a paper clip because the circuit is completed.

An electronic circuit comprises of individual electronic components like resistors, diodes,transistors , capacitors,etc. which are connected to each other by means of wires  through which electric current flows.It can also be referred to as an electronic circuit.

It usually comprises of at least one active component . The combination of wires and simple and complex components allows operations to be performed, amplification of signals, displacement of data and performing of computations.

There are  three types of circuits , an analog circuit ,a digital circuit and a mixed circuit which is combination of digital and analog circuits , even semiconductors are used in circuits.

Learn more about circuit,here:

https://brainly.com/question/12608491

#SPJ2

The number of moles of electrons that travel through the wire is approximately 0.8209 mol.

To calculate the number of moles of electrons that travel through a copper wire, we need to use Faraday's constant, which relates the amount of charge to the number of moles of electrons.

Faraday's constant is defined as 1 mole of electrons per 96,485 coulombs (C).

First, we need to calculate the total charge that passes through the wire using the equation:

Charge (C) = Electric Current (A) × Time (s)

Given that the current is 60 A and the time is 22.0 minutes (which needs to be converted to seconds), we have:

Time (s) = 22.0 minutes × 60 seconds/minute

Next, we can calculate the charge:

Charge (C) = 60 A × (22.0 minutes × 60 seconds/minute)

Now we can calculate the number of moles of electrons:

Moles of electrons = Charge (C) / Faraday's constant

Moles of electrons = Charge (C) / (96,485 C/mol)

Let's perform the calculation:

Time (s) = 22.0 minutes × 60 seconds/minute = 1320 seconds

Charge (C) = 60 A × 1320 seconds = 79,200 C

Moles of electrons = 79,200 C / 96,485 C/mol ≈ 0.8209 mol (rounded to four significant digits)

Therefore, the number of moles of electrons that travel through the wire is approximately 0.8209 mol.

To know more about electric current:

https://brainly.com/question/33020058

#SPJ4

The density of the unknown solid is approximately 109.864 lb/ft³. To convert the density from grams per cubic centimeter (g/cm³) to pounds per cubic foot (lb/ft³), we need to use appropriate conversion factors.

1 gram is equal to 0.00220462 pounds, and 1 cubic centimeter is equal to 0.0000353147 cubic feet.

First, let's convert the density from g/cm³ to kg/m³. Since 1 kg is equal to 1000 grams and 1 cubic meter is equal to 1,000,000 cubic centimeters, we can use the following conversion:

Density in kg/m³ = Density in g/cm³ × 1000 kg/m³ ÷ 1 g/cm³

Density in kg/m³ = 18.5 g/cm³ × 1000 kg/m³ ÷ 1 g/cm³ = 18500 kg/m³

Now, let's convert the density from kg/m³ to lb/ft³. Since 1 kilogram is equal to 2.20462 pounds and 1 cubic meter is equal to 35.3147 cubic feet, we can use the following conversion:

Density in lb/ft³ = Density in kg/m³ × 2.20462 lb/ft³ ÷ 1 kg/m³ ÷ 35.3147 ft³/m³

Density in lb/ft³ = 18500 kg/m³ × 2.20462 lb/ft³ ÷ 1 kg/m³ ÷ 35.3147 ft³/m³ ≈ 109.864 lb/ft³

Therefore, the density of the unknown solid is approximately 109.864 lb/ft³.

Learn more about density here:

https://brainly.com/question/29775886

#SPJ11

Answer:

The correct answer is D. B = +3; H = -1.

To draw the Lewis dot structure of the BH4 ion, we first determine the total number of valence electrons:

B: 3 valence electrons

H: 1 valence electron x 4 = 4 valence electrons

Total: 3 + 4 = 7 valence electrons

The single B atom is the central atom, and the four H atoms are attached to it. Each H atom forms a single bond with the B atom, which uses up 4 valence electrons:

H H

| |

H-B-H

|

H

We have 3 valence electrons left, which we place around the central B atom as lone pairs:

H H

| |

H-B-H

| |

H--

Each H atom has a full valence shell (2 electrons), and the B atom has an octet (8 electrons). However, the B atom now has 5 valence electrons, which gives it a formal charge of +3. Each H atom now has only 1 valence electron, which gives it a formal charge of -1. The sum of the formal charges in the BH4 ion is 0, as it should be for a neutral molecule/ion.

A term which defines the sum of protons and neutrons in an atom is mass number.

In Chemistry, mass number is sometimes referred to as nucleon number or atomic mass number and it can be defined as the total number of protons and neutrons found in the atomic nucleus of a chemical element.

Mathematically, mass number can be represented by the following formula:

A = Z + N  or \(^A_ZC\)

Where:

Therefore, we can deduce that mass number is the sum of protons and neutrons in an atom of a chemical element.

Read more on atoms here: https://brainly.com/question/29793337

#SPJ4

According to solubility rules, water insoluble  compound should not dissolve in water.

Solubility is defined as the ability of a substance which is basically solute to form a solution with another substance. There is an extent to which a substance is soluble in a particular solvent. This is generally measured as the concentration of a solute present in a saturated solution.

The solubility mainly depends on the composition of solute and solvent ,its pH and presence of other dissolved substance. It is also dependent on temperature and pressure which is maintained.

Learn more about solubility,here:

https://brainly.com/question/22185953

#SPJ1

Answer:

Explanation: I did the work online because I just worked on this.

Answer: the constant process of photosythesis

Explanation:

it say in the etxt book

Answer:15.9994 g/mol

Explanation:

The compound with the SMILES string COCCOC has the structure: CH3-O-CH2-CH2-O-CH3. In this molecule, the protons are labeled as follows:

I. Protons on the first carbon (CH3)

II. Protons on the second carbon (CH2)

III. Protons on the third carbon (CH2)

IV. Protons on the fourth carbon (CH3)

The correct order of increasing chemical shifts is I < II ≈ III < IV.

In a 1H NMR spectrum, chemical shifts depend on the electron density around the protons and their environment. Here is a correct prediction of the chemical shifts for the signals:

I. Protons on the first carbon (CH3) will have the lowest chemical shift, as they are adjacent to an electron-rich oxygen atom, which decreases the electron density around the protons.

II. Protons on the second carbon (CH2) will have a higher chemical shift than I, due to being further away from the oxygen atom, but will still be relatively low as they are adjacent to a CH3 group.

III. Protons on the third carbon (CH2) will have a similar chemical shift to II, as their environment is quite similar.

IV. Protons on the fourth carbon (CH3) will have the highest chemical shift, as they are furthest from the oxygen atoms and adjacent to a CH2 group.

Therefore, the correct order of increasing chemical shifts is: I < II ≈ III < IV.

To know something about the chemical shift, click below.

https://brainly.com/question/31321646

SPJ11