Please choose the best description, or definition for Principle of Fossil Correlation

Answer:

then use those and set up one

Explanation:

Answer:

the string and the cans for me. its like your own phone

Explanation:

Answer: 2. 29.2%

Explanation:

Nitrous acid is a weak acid dissociation reaction, written using the H30 convention, is: HNO2 + H30 (where is used as the equilibrium symbol).

nitrous acid is an inorganic compound having the formula HNO3. It is a powerfully corrosive mineral acid. Although the material is colorless, older samples could have a yellow tint from nitrogen oxide decomposition. Most commercially available nitric acid has a 68% concentration in water. When the solution contains more than 86% HNO3, nitric acid flares. Depending on how much nitrogen dioxide is present, fuming nitric acid can also be categorized as red fuming nitric acid at concentrations above 86% or white fuming nitric acid at concentrations above 95%.

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Use the following formula to obtain the ascorbic acid content in milligrams of a vitamin C tablet:

Mass of ascorbic acid (mg) = Volume of NaOH (mL) x Concentration of NaOH (mol/L) x Molar mass of ascorbic acid (g/mol) x 1000 / 1

We must first determine the molar mass of ascorbic acid:

Molar mass of ascorbic acid = (6 x atomic mass of carbon) + (8 x atomic mass of hydrogen) + (6 x atomic mass of oxygen)

= (6 x 12.01) + (8 x 1.01) + (6 x 16.00)

= 176.12 g/mol

Now we can substitute the values ​​in the formula into:

Mass of ascorbic acid (mg) = 20.74 mL x 0.201 mol/L x 176.12 g/mol x 1000 / 1

= 739.1 mg

Therefore, the amount of ascorbic acid in the Vitamin C tablet is 739.1 mg.

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Your question is incomplete, most probably the complete question is:

A vitamin C (ascorbic acid) tablet was dissolved in approximately 50 mL of distilled water and titrated with the standardized NaOH solution. From the results of this titration, the mg of ascorbic acid in the tablet was calculated. Molecular formula of ascorbic acid: C6H8O6 Volume of NaOH required to neutralize ascorbic acid in Vitamin C tablet (mL) 20.74 Concentration of NaOH in mol/L, 0.201 Calculate the amount of ascorbic acid in the Vitamin C tablet in (mg).

The total mass of the balloon and its content is 1521.17 g, the number of moles of CO₂ in the balloon is 34.15 mol, and the number of CO₂ molecules in the balloon is 2.06 x 10²⁵ molecules.

a) The molar mass of CO₂ is 44.01 g/mol. To find the total mass of the balloon and its content, we need to add the mass of the balloon (20g) to the mass of the CO₂ inside the balloon.

Mass of CO₂ = number of moles of CO₂ x molar mass of CO₂

Since the balloon is at STP (standard temperature and pressure), we can use the molar volume of a gas at STP (22.4 L/mol) to find the number of moles of CO₂ in the balloon:

Volume of CO₂ = Volume of balloon = 765 L (at STP)

Number of moles of CO₂ = volume of CO₂ / molar volume of a gas at STP

                                          = 765 L / 22.4 L/mol

                                          = 34.15 mol

Mass of CO₂ = 34.15 mol x 44.01 g/mol

                       = 1501.17 g

Total mass of balloon and its content = 20 g + 1501.17 g

                                                               = 1521.17 g

b) Number of moles of CO₂ in the balloon is 34.15 mol

c) To find the number of CO₂ molecules in the balloon, we need to use Avogadro's number (6.02 x 10²³ molecules/mol).

Number of CO₂ molecules = number of moles of CO₂ x Avogadro's number

                                           = 34.15 mol x 6.02 x 10²³ molecules/mol

                                           = 2.06 x 10²⁵ molecules

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The volume of 12 gas forms when 21 L Cl2 react at STP is 21 L.

To determine the volume of 12 gas (I assume you mean I2 gas) formed when 21 L of Cl2 reacts at STP (standard temperature and pressure), we need to use the ideal gas law equation.

The ideal gas law equation is given by:

PV = nRT

Where:

P = pressure

V = volume

n = number of moles

R = ideal gas constant

T = temperature

At STP, the pressure is 1 atm, and the temperature is 273.15 K.

From the balanced equation, we can see that the molar ratio between Cl2 and I2 is 1:1. So, if 21 L of Cl2 reacts, it will produce an equal volume of I2 gas.

Given that the volume of Cl2 is 21 L, we can assume the volume of I2 gas formed will also be 21 L.

Therefore, the volume of I2 gas formed is 21 L.

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If a penguin has to walk 70 miles at a rate of .75 meters per second, 66  days do it take to make the trip.

The term speed is defined as the rate of change of position of an object in any direction. Speed is calculated as follows: speed = distance × time.

The distance traveled in relation to the time it took to travel that distance is how speed is defined. Since speed simply has a direction and no magnitude, it is a scalar quantity.

If you know how far something has traveled and how long it took to get there, you can calculate its average speed.

Time = distance / speed

distance = 0.75 meters

speed = 70 miles = 112.654 kilometres

Substitute this value in above formula

Time = 0.75 / 112.654

= 0.66

Thus, If a penguin has to walk 70 miles at a rate of .75 meters per second, 66  days do it take to make the trip.

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Given parameters:

Mass of sucrose  = 5g

Density of sucrose  = 1.12g/mL

Percentage of sucrose per liter of cane juice  = 12%

Unknown:

Volume of cane juice needed = ?

We need to establish the volume - density relationship. Density is the mass of a substance per unit volume.

Mathematically;

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

Now solve for the volume of sucrose;

                  1.12g/mL = \(\frac{5}{Volume}\)

       Volume  = \(\frac{5}{1.12}\)    =  4.46mL   = 4.46 x 10⁻³L since 1000mL  = 1L

Since 12% of 1 liter of cane juice is sucrose;

                    12% of  x  liter of cane juice  = 4.46 x 10⁻³L

                   Volume of cane juice  = 4.46 x 10⁻³ x \(\frac{100}{12}\)   = 0.037L

Volume of cane juice is  0.037L

When metals and non metals combine in fixed proportion then a chemical compound is formed So, the compound that will be formed from group 13 elements and group 17 is AlCl₃.

Chemical formula is a formula where cation and anion combine to form a molecule in fixed proportion. Metals combine in form of cation and non metals combine in form of anion.

Cation is the species that give electron and attain positive charge while anion is a species which gain electron and attains negative charge so when anion and cation combine in fixed ration the the overall charge of the molecule is zero that is molecule is neutral, the charge over cation and anion is also called oxidation state. the compound that will be formed from group 13 elements and group 17 is AlCl₃.

Therefore, the correct option is option A.

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Answer:

it is a square

Explanation:

I hope it will helps you

sorry it's not a true answer

because I want points

Because HCl is a stronger acid than acetic acid, the pH of 0.01M acetic acid has greater value than the pH of 0.01M HCl. 2.88 is the  pH of a 0.01 M acetic acid.

Any hydrogen that comprises a material capable of giving a proton (a hydrogen ion) to another chemical is defined as acid. A base is indeed a molecule or ion that can receive a hydronium ion from just an acid.

1)Because HCl is a stronger acid than acetic acid, the pH of 0.01M acetic acid has greater value than the pH of 0.01M HCl. The pH value of stronger acid is lower.

2)CH\(_3\)COOH + H\(_2\)O  ⇄ CH\(_3\)COO⁻+  H\(_3\)O⁺

 0.01             0               0

 -x              +x                +x

 0.01-x           +x        +x

Ka=[ CH\(_3\)COO⁻][H\(_3\)O⁺]/[CH\(_3\)COOH]

1.8×10⁻⁵ = [x][x ]/[  0.01-x ]

x=1.34×10⁻³

pH = -log[H⁺]

     =  -log[1.34×10⁻³]

     =2.88

Therefore, because HCl is a stronger acid than acetic acid, the pH of 0.01M acetic acid has greater value than the pH of 0.01M HCl. 2.88 is the   pH of a 0.01 M acetic acid.

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Answer:

thermal energy

Explanation:

Answer:

B- Thermal Energy

Explanation:

Thermal energy is produced due to all of the movement of particles inside the material.

Considering the definition of STP conditions and molar mass, there are 37.3208 grams of 19.00 L of propane vapor (C₃H₈) at STP.

The STP conditions refer to the standard temperature and pressure. Pressure values at 1 atmosphere and temperature at 0 ° C are used and are reference values for gases. And in these conditions 1 mole of any gas occupies an approximate volume of 22.4 liters.

The molar mass of substance is a property defined as its mass per unit quantity of substance, in other words, molar mass is the amount of mass that a substance contains in one mole.

In this case, you have 19.00 L of propane vapor (C₃H₈) at STP.

You can apply the following rule of three: if by definition of STP conditions a volume of 22.4 L is occupied by 1 mole of propane, a volume of 19 L is occupied by how many moles of propane?

moles of propane= (19 L× 1 mole)÷ 22.4 L

moles of propane= 0.8482 moles

Considering that the molar mass of propane is 44 g/mole, you can apply the following rule of three: If 1 mole of propane contains 44 grams, 0.8482 moles contains how much mass of propane?

mass of propane= (0.8482 moles× 44 grams)÷ 1 mole

mass of propane= 37.3208 grams

Finally there are 37.3208 grams of propane in 19 L.

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Answer: 1. The empirical formula is \(PNF_2\)  

2. The molecular formula is \(PNF_2\)

Explanation:

If percentage are given then we are taking total mass is 100 grams.

So, the mass of each element is equal to the percentage given.

Mass of P = 37.32 g

Mass of N = 16.88 g

Mass of F = 45.79 g

Step 1 : convert given masses into moles.

Moles of P =\(\frac{\text{ given mass of P}}{\text{ molar mass of P}}= \frac{37.32g}{31g/mole}=1.20moles\)

Moles of N =\(\frac{\text{ given mass of N}}{\text{ molar mass of N}}= \frac{16.88g}{14g/mole}=1.20moles\)

Moles of F =\(\frac{\text{ given mass of F}}{\text{ molar mass of F}}= \frac{45.79g}{19g/mole}=2.41moles\)

Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.

For P = \(\frac{1.20}{1.20}=1\)

For N = \(\frac{1.20}{1.20}=1\)

For F =\(\frac{2.41}{1.20}=2\)

The ratio of P: N: F= 1: 1: 2  

Hence the empirical formula is \(PNF_2\)

The empirical weight of \(PNF_2\)= 1(31)+1(14)+2(19)= 82.98 g.

The molecular weight = 82.98 g/mole

Now we have to calculate the molecular formula.

\(n=\frac{\text{Molecular weight}}{\text{Equivalent weight}}=\frac{82.98}{82.98}=1\)

The molecular formula will be=\(1\times PNF_2=PNF_2\)

Answer:

Because of pressure

Explanation:

A substance's temperature in physics' laws, is directly related to the average kinetic energy of its particles. Because the particles' mass is constant, they must travel faster as the temperature rises.

In physics, the kinetic energy of an object is the energy it possesses as a result of its motion. It is defined as the amount of work required to accelerate a body of a given mass from rest to a given speed.

The body retains its kinetic energy, having acquired it during acceleration, until its speed changes.

Kinetic energy is present in an accelerating ball, a walking human, and electromagnetic radiation like light. Another type of kinetic energy is the energy associated with the continuous, random bouncing of atoms or molecules.

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Acetic acid upon dissociation in water gives acetate ion and hydrogen ion as written in the chemical equation:

\(\rm CH_{3}COOH \rightarrow CH_{3}COO^{-} + H^{+}\).

Acetic acid is weak carboxylic acid. It is the simplest organic acid other than formic acid HCOOH. Acetic acid contains one methyl unit and the carboxyl group COOH.

Diluted acetic acid is used as vinegar to preserve food items such as pickle, salads etc. It gives a sore taste to the food also. Acetic acid is soluble in water and will dissociates into carboxylate ion and hydrogen ion.

Even though acetic acid easily loses a proton the carboxylate ion CH3COO- is not stable and it is a weak base the reverse of the reaction dominates in equilibrium.However in the presence of strong acids it can acts as a weak base also.

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Answer:

958 g is the mass of LiOH that can react with all the CO₂

Explanation:

CO₂(g) + 2 LiOH(s) → Li₂CO₃(aq) + H₂O

We think in the reaction:

1 mol of carbon dioxide can react with 2 moles of lithium hydroxide.

First of all, we convert the mass of our reactant to mol:

880 g . 1mol /44g = 20 moles

As ratio is 1:2, 20 moles of CO₂ will react with 40 moles of LiOH.

Let's determine the mass:

40 mol .  23.95 g /1mol = 958 g

Answer:

D 4,3,2

Explanation:

4 Co + 3 O2 ----> 2 Co2O3

Answer:

THE MOLAR HEAT CAPACITY OF HEXANE IS 290.027 J/ C

Explanation:

1604 J of heat is added to 48.9 g of hexane

To calculate the molar heat capacity of hexane, it is important to note that the molar heat capacity of a substance is the measure of the amount of heat needed to raise 1 mole of a substance by 1 K.

Since 1604 J of heat = 48.9 g of hexane

Molar mass of hexane = 86 g/mol = 1 mole

then;

1604 J = 48.9 g

x = 86 g

x = 1604 * 86 / 48.9

x = 4205.4 J

Hence, 4205.4 J of heat will be added to 1 mole or 86 g of hexane to raise the temperature by 14.5 C.

In other words,

heat = molar heat capacity * temperature change

molar heat capacity = heat/ temperature change

Molar heat capacity = 4205.4 J / 14.5 C

Molar heat capacity = 290.027 J/C

The molar heat capacity of hexane is 290.027 J/ C

According to the law of conservation of Mass:

In a chemical reaction mass can neither be created nor be destroyed

So, we can say that: Mass of A + Mass of B = Mass of C

In the given reaction,

One of the reactants weigh 5 grams and another one weighs x grams

The mass of the product of this reaction is 9 grams

Mass of reactant B:

Mass of A + Mass of B = Mass of C

5 + x = 9

x = 4 grams

The root-mean-square velocity of an oxygen molecule at 55.2 °C is approximately 481.1 m/s.

Root-mean-square velocity is the measure of the speed of gas molecules in a gas sample. It is the square root of the average of the squared velocities of the gas particles in a gas sample.

The root-mean-square velocity of an oxygen molecule can be calculated using the following formula:

v(rms) = √[(3RT)/M]

T = 55.2 °C + 273.15 = 328.35 K

Converting M to kg/mol:

M = 32 g/mol = 0.032 kg/mol

Plugging in the values:

v(rms) = √[(3 x 8.314 J/mol.K x 328.35 K) / 0.032 kg/mol]

v(rms) = 481.1 m/s

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The amount of heat energy produced when 1 g of hydrogen and 2 g of nitrogen are reacted, is -6.61 KJ

First, we shall obtain the limiting reactant. Details below:

3H₂ + N₂ -> 2NH₃

From the balanced equation above,

28 g of N₂ reacted with 6 g of H₂

Therefore,

2 g of N₂ will react with = (2 × 6) / 28 = 0.43 g of H₂

We can see that only 0.43 g of H₂ is needed in the reaction.

Thus, the limiting reactant is N₂

Finally, we the amount of heat energy produced. Details below:

3H₂ + N₂ -> 2NH₃ ΔH = -92.6 KJ

From the balanced equation above,

When 28 grams of N₂ reacted, -92.6 KJ of heat energy were produced.

Therefore,

When 2 grams of N₂ will react to produce = (2 × -92.6) / 28 = -6.61 KJ

Thus the heat energy produced from the reaction is -6.61 KJ

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Answer

820866.45 grams C₃H₃N can be obta

Explanation

Given balanced equation:

Given reacting mass of C₃H₆ = 651 kg

What to find:

The mass of C₃H₃N obtained from 651 kg of C₃H₆

Step-by-step soltion:

From the Periodic Table:

Molar mass of C₃H₆ = 42.08 g/mol

Molar mass of C₃H₃N = 53.06 g/mol

You need to convert the given reacting mass of C₃H₆ from kilograms, (kg) to grams, (g).

Conversion factor:

1 kg = 1000 g

So 651 kg = 651 x 1000 = 651,000 grams

From the balanced equation above;

(4 mol x 42.08 g/mol) = 168.32 g C₃H₆ produced (4 mol x 53.06 g/mol) = 212.24 g C₃H₃N

Therefore 651,000 g C₃H₆ will produce

Answer:

It is D low precision, high accuracy

Explanation:

I got it correct

The Xs show the location of beanbags a student tossed at a target. The student was aiming for the center circle. Low precision, high accuracy​  best describe the student's results. Therefore, option D is correct.

There are two ways to assess observational error: accuracy and precision. Precision measures how closely two measurements are to one another, whereas accuracy measures how close a group of measurements is to its actual value. In other words, precision is a measure of statistical variability and a description of random errors.

The proximity of two or more measurements to one another is referred to as precision. Using the aforementioned example, your measurement is extremely accurate if you weigh a certain substance five times and obtain 3.2 kg each time. Accuracy is not necessary for precision.

Regardless of whether or whether two or more measurements are correct, precision is described as "the property of being exact" and relates to how close two or more measurements are to one another.

Thus, option D is correct.

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Answer:

B. Branched Alkene

HOPE THIS HELPS :-)

Answer:

yep C is correct!!

Explanation:

Answer:

19.29 g/\(cm^{3}\)

Explanation:

Gold nugget - what we know:

Density's formula: (g/\(cm^{3}\))

Gold volume: 1.68 \(cm^{3}\)

Gold mass: 32.4 g

Use the density formula to find the density of the gold nugget:

= (g ÷ \(cm^{3}\))

= (32.4 ÷ 1.68)

= 19.285 g/\(cm^{3}\)

Therefore the gold nugget has a density of 19.29 g/\(cm^{3}\)