Why do you need to combust benzoic acid before testing the "unknown" sample you are interested in? Why do you need to combust more than one sample of the "unknown" you are testing?

Answers

Answer 1

Various samples of the must be combusted in other to obtain a reliable result.

What is a bomb calorimeter?

The bomb calorimeter is used to obtain the energy of a sample. This is called the energy equivalent or the energy value of the sample.

Now, we know that the bomb calorimeter is calibrated by the use of benzoic acid hence it must be combusted first to obtain the basic energy value of the calorimeter.

Various samples of the must be combusted in other to obtain a reliable result.

Learn more about bomb calorimeter:https://brainly.com/question/24245395?

#SPJ1


Related Questions

Give some examples of what are sand good for explaining is involved!

Answers

Explanation:

The definition of a god is an image, person or thing that is worshiped, honored or believed to be all-powerful or the creator and ruler of the universe. An example of a god is Ganesha, a Hindu diety.

0.467 mol NaCl are needed to
create a 0.875 m solution using 534
g of water. How many grams of
sodium chloride are required to
make the solution?

Answers

Answer:

27.4 gram is the solution it's simple dude...

Explanation:

don't be afraid of huge question they confuse you you need not to be confused

now see simple solution

molality is denoted by m

so

m= moles of solute / mass of solvent in kg.

i hope your know the meaning of solute and solvent....

so moles are given 0.467

and molar mass is given 58.44

so just take out the gram means

by applying formula

58.44×0.467

it will give 27.4 grams simple.....

2. four bulbs connoted in parallel controlled by a single pole switch using
alternating current

Answers

Answer

I think there should be two poles, a north pole and a south pole. so this statement is wrong

5.00g of an unknown metal we know has a +2 charge (M^+2) is reacted with an excess of hydrochloric acid (HCl(aq)). The product is dried and weighs 11.35 grams. What is the formula and name of the product formed?

Answers

the formula: MCl₂

name of the product formed: chloride salt + hydrogen

Rafa then places some zinc in a solution of lead nitrate. A displacement
reaction takes place. Write the word equation for this reaction.

Answers

Answer:

Explanation:

A solution of zinc metal and lead nitrate react to form zinc nitrate and lead metal.

Zn(s) + Pb(NO3)2 = Zn(NO3)2 + Pb

Why do lunar and solar eclipses not happen every month?

Answers

A lunar eclipse occurs when The moon’s orbit is tilted five degrees from earth’s orbit around the sun .

A 35. 0-l steel tank at 20. 0?c contains acetylene gas, c2h2, at a pressure of 1. 39 atm. Assuming ideal behavior, how many grams of acetylene are in the tank?.

Answers

52.66 grams of acetylene are in the tank.

PV=nRT is the formula for ideal gases, where P is the pressure and R is the constant and T is the temperature (P is 1.39 atm in this case)

Volume = 35.0 L

Gas constant = 0.08206 L.atm/K.mole

Temperature = 20.0 °C  = 293 °C

We also know that we can apply the formula ;

Number of mole(n) = [tex]\frac{MmPV}{RT}[/tex]

m = ( 26.04 × 1.39 × 35 )/ (0.08206 × 293.15)

m = 52.66 g

Thus, the mass is 52.66 grams.

Learn more about ideal gases here:

https://brainly.com/question/12281987

#SPJ4

the screenshts below

Answers

Answer:

yes so for example one

Explanation:

yeah so

Short Response
Directions: Base your answers to questions 6 and 7 on the information below and your knowledge of chemistry.
Ammonia, NH3(g), can be used as a substitute for fossil fuels in some internal combustion
engines. The reaction between ammonia and oxygen in an engine is represented by
the unbalanced equation below.
NH3(g) + O₂(g) → N₂(g) + H₂O(g) + energy
6. Balance the equation in the space below for the reaction of ammonia and oxygen, using the
smallest whole-number coefficients.
7. Show a numerical setup for calculating the mass, in grams, of a 4.2-mole sample of 0₂. Use 32
g/mol as the gram-formula mass of 0₂.

Answers

Answer:

6.)

7.)  134.4 g O₂

Explanation:

The unbalanced equation:

NH₃ (g) + O₂ (g) ---> N₂ (g) + H₂O (g) + energy

Reactants: 1 nitrogen, 3 hydrogen, 2 oxygen

Products: 2 nitrogen, 2 hydrogen, 1 oxygen

The balanced equation:

4 NH₃ (g) + 3 O₂ (g) ---> 2 N₂ (g) + 6 H₂O (g) + energy

Reactants: 4 nitrogen, 12 hydrogen, 6 oxygen

Products: 4 nitrogen, 12 hydrogen, 6 oxygen

To convert from moles to grams, you need to multiply the starting value (4.2 moles) by the molar mass (32.00 g/mol). The molar mass can serve as a conversion because it technically means there are 32.00 grams O₂ per every 1 mole. It is important to arrange this ratio in a way that allows for the cancellation of units (the desired unit should be in the numerator).

4.2 moles O₂          32.00 g
--------------------  x  ----------------  =  134.4 g O₂
                                1 mole

The 9.6 g object displaced
3.2 mL of water.
What is its density in g/mL?
density=[?] g/mL

Answers

Answer: 3

Explanation:

Density is mass/volume divide the mass 9.6 by the volume of 3.2

[tex]\frac{9.6}{3.2} =3[/tex]

The density of the object displaced in water is equal to 3 g/ml.

What is the density?

The density of a substance can be described as the substance's mass per unit of its volume. The symbol is generally used to represent density ρ and the letter D can be used.

The mathematical formula of the density of a material can be represented as shown below:

Density = Mass/volume

ρ = m/V

The density of a material varies with pressure as well as temperature. There is a small variation in the density of the solids and liquids but much larger for gases. Increasing the pressure of the substance decreases the volume and thus increases its density.

As the object displaced water of volume of 3.2 ml.  

Therefore, the volume of the object, V = 3.2 ml

The mass of the object, m = 9.6 g

The density of the object placed in water can be calculated as:

Density of object = 9.6/3.2 = 3 g/ml

Therefore, the density of the object is 3 g/ml.

Learn more about density, here:

brainly.com/question/15164682

#SPJ2

Based on the equation, how many grams of Br2 are required to react completely with 42.3 grams of AlCl3?

2AlCl3 + 3Br2 → 2AlBr3 + 3Cl2

66.5 grams
71.2 grams
76.1 grams
80.2 grams

Answers

Answer:

C.) 76.1 grams

Explanation:

To find the mass of bromine, you need to (1) convert grams AlCl₃ to moles AlCl₃ (via molar mass), then (2) convert moles AlCl₃ to moles Br₂ (via mole-to-mole ratio from reaction coefficients), and then (3) convert moles Br₂ to grams Br₂ (via molar mass). It is important to arrange your ratios/conversions in a way that allows for the cancellation of units (the desired unit should be in the numerator).

Molar Mass (AlCl₃): 26.982 g/mol + 3(35.453 g/mol)

Molar Mass (AlCl): 133.332 g/mol

2 AlCl₃ + 3 Br₂ --> 2 AlBr₃ + 3 Cl₂

Molar Mass (Br₂): 2(79.904 g/mol)

Molar Mass (Br): 159.808 g/mol

42.3 g AlCl₃          1 mole               3 moles Br₂           159.808 g
------------------  x  -----------------  x  ----------------------  x  -------------------  =
                            133.332 g         2 moles AlCl₃            1 mole

=  76.0 g Br

*Our answers are slightly different most likely because we used slightly different molar masses*

What is the answer to “An element is:”

Answers

Answer:

Option A

A pure chemical substance consisting of one type of atom.

Explanation: An element is a pure substance and is made of only one type of atom; it cannot be broken down into a simpler substance.

An element is defined as  a pure chemical substance consisting of one type of atom.

What is an element?

It is defined as a substance which cannot be broken down further into any other substance. Each element is made up of its own type of atom. Due to this reason all elements are different from one another.

Elements can be classified as metals and non-metals. Metals are shiny and conduct electricity and are all solids at room temperature except mercury. Non-metals do not conduct electricity and are mostly gases at room temperature except carbon and sulfur.

The number of protons in the nucleus is the defining property of an element and is related to the atomic number.All atoms with same atomic number are atoms of same element.There are 118 elements known to exist either naturally or artificially.

Learn more about elements,here:

https://brainly.com/question/1812430

#SPJ2

Kajal is a compound or a mixture?​

Answers

It is a mixture…………….

The pH of a solution is measured as 8.3. What is the hydrogen ion
concentration of the solution?
OA. 2.0 x 108 M
OB. 8.0 x 10-³ M
OC. 8.3 M
OD. 5.0 x 109 M

Answers

Answer:

D.) 5.0 x 10⁻⁹ M

Explanation:

The formula displaying the relationship between pH and hydrogen ion concentration is:

pH = -log[H⁺]

In this formula "[H⁺]" represents the concentration of hydrogen ions (given in molarity (M)). Therefore, to find this value, you need to take the inverse of the log. The manipulation looks like this:

pH = -log[H⁺]  ------------>  [H⁺] = 10^-pH

Note that the carrot (^) represents an exponent. Now, you can plug your pH value into the equation to find the molarity.

[H⁺] = 10^-pH

[H⁺] = 10^-8.3

[H⁺] = 5.0 x 10⁻⁹ M

as a nail approaches the south pole of a magnet, what happens to its magnetic domains?

A. The north poles of the domains point toward the magnet.
B. The south poles of the domains point toward the magnet.
C. The domains spin, but end up in no particular pattern.
D. The domain remain unaffected by the magnet.

Answers

The domain remain unaffected by the magnet is the right answer.

What happens to its magnetic domains?

Both the north poles and the south poles of the domains point toward the magnet so the domains is unaffected by the magnet as the nail approaches to the south pole of a magnet.

So we can conclude that the domain remain unaffected by the magnet is the right answer.

Learn more about magnet here: https://brainly.com/question/14997726

#SPJ1

Answer. The domain remain unaffected by the magnet

does anyone understand these?

Answers

Answer:

6) 47588

4.7 * 10 power 4 ( by rounding off)

7) 1 mm ---> 1,000,000

? 120

120 * 1 / 1000000

12/ 100000

0.0012

1.2 * 10 power -4.

8) Volume is the amount of space something occupies

A 2. 75-l container filled with co2 gas at 25°c and 225 kpa pressure springs a leak. When the container is re-sealed, the pressure is 185 kpa and the temperature is 10°c. How many moles of gas were lost?.

Answers

The number of moles of gas lost is  0.0213 mol. It can be solved with the help of Ideal gas law.

What is Ideal law ?

According to this law, "the volume of a given amount of gas is directly proportional to the number on moles of gas, directly proportional to the temperature and inversely proportional to the pressure. i.e.

PV = nRT.

Where,

p = pressure V = volume (1.75 L = 1.75 x 10⁻³ m³)T =  absolute temperature n = number of molesR =  gas constant, 8.314 J*(mol-K)

Therefore, the number of moles is

n = PV / RT

State 1 :

T₁ = (25⁰ C = 25+273 = 298 K)p₁ = 225 kPa = 225 x 10³ N/m²

State 2 :

T₂ = 10 C = 283 Kp₂ = 185 kPa = 185 x 10³ N/m²

The loss in moles of gas from state 1 to state 2 is

Δn = V/R (P₁/T₁ - P₂/T₂ )

V/R = (1.75 x 10⁻³ m³)/(8.314 (N-m)/(mol-K) = 2.1049 x 10⁻⁴ (mol-m²-K)/N

p₁/T₁ = (225 x 10³)/298 = 755.0336 N/(m²-K)

p₂/T₂ = (185 x 10³)/283 = 653.7102 N/(m²-K)

Therefore,

Δn = (2.1049 x 10⁻⁴ (mol-m²-K)/N)*(755.0336 - 653.7102 N/(m²-K))

    = 0.0213 mol

Hence, The number of moles of gas lost is 0.0213 mol.

Learn more about ideal gas here ;

https://brainly.in/question/641453

#SPJ1

would you expect the substance to float or sink in water if mass is 25g and volume is 7 cm​

Answers

Answer:

Sink

Explanation:

For a substance to float in water, it must be less dense than water. The density of water is 1 g/cm^3. To find the density of the substance, we can do mass/volume, which in this case is 25g/7cm^3. We see that [tex]25/7 > 1[/tex], so the substance would sink.

54.0 g Al creates up to 102 g Al2O3 and 64.0 g O2 creates up to 136 g Al2O3.

What is the theoretical yield (amount of Al2O3 formed) for this reaction?

[?] g Al₂O3

Answers

The theoretical yield of the product is 204 g of the product .

What is the theoretical yield?

The theoretical yield is the yield of the reaction as obtained from the stoichiometry of the reaction.  

The reaction equation is given as 4Al + 3O2 → 2Al2O3

Number of moles of Al = 54.0 g/27 g/mol = 2 moles

Number of moles of oxygen = 64.0 g/32 g/mol = 2 moles of O2

Hence,

If 4 moles of Al yields 2 moles of Al2O3 then 204 g of the product is obtained.

Learn more about theoretical yield:https://brainly.com/question/14966377?

#SPJ1

Answer: 102

Explanation:

A 1. 07 g sample of a noble gas occupies a volume of 363 ml at 35°c and 678 mmhg. Identify the noble gas in this sample. (r = 0. 08206 l×atm/k×mol)

Answers

The identity of the noble gas is the sample is Krypton

Ideal Gas law

From the question, we are to determine the identity of the noble gas in the sample

From the ideal gas equation, we have that

PV = nRT

∴ n = PV / RT

Where P is the pressure

V is the volume

n is the number of moles

R is the gas constant

and T is the temperature

From the given information,

P = 678 mmHg = 0.892105 atm

V = 363 mL = 0.363 L

R = 0.08206 L.atm/mol.K

T = 35 °C = 35 + 273.15 K = 308.15 K

Putting the parameters into the equation, we get

n = (0.892105 × 0.363)/ (0.08206 × 308.15)

n = 0.0128 moles

Now, we will determine the Atomic mass of the sample

Using the formula,

Atomic = Mass / Number of moles

Atomic mass of the substance = 1.07 / 0.0128

Atomic mass of the substance = 83.6 amu

The noble gas with the closest atomic mass to this value is Krypton.

Molar mass of Krypton = 83.798 amu

Hence, the identity of the noble gas is the sample is Krypton

Learn more on Ideal Gas law here: https://brainly.com/question/20212888

#SPJ12

What is the mass of a piece of
copper that displaces 3.0 mL
of water and has a density of
9.0 g/cm³?
mass = density x volume

Answers

Answer:

27 gm

Explanation:

Well..... the volume of the copper is   3 cm^3

9.0  g/cm^3    * 3 cm^3 = 27 gm

When you breathe, oxygen binds to the hemoglobin in your lungs and then is released into tissue cells. What type of reaction is this? A. Haber B. Irreversible C. Reversible D. Double replacement

Answers

Answer:

i believe c. reversible

Explanation:

oxygen combines with hemoglobin and detaches

Answer:

c

Explanation:

same answer i got from quiz

Cyclohexene oxidation with potassium permanganate gives three different products, depending on conditions. what product (one) could not be obtained

Answers

Answer:

will you help us with that one please

The theoretical yield of NaBr from
2.36 mol FeBr3 is 7.08 mol NaBr.
What is the percent yield if 6.14 mol
NaBr were collected?
[?]%

Answers

the percent yield of the reaction is 100%.

The percent yield is calculated as the experimental yield divided by the theoretical yield x 100%:

% yield = actual yield / theoretical yield * 100%

% yield of a reaction in this case Rate

In this case, the molar mass of NaBr is 102.9 g / mol, as you know:

444 actual yield = 7.08 mol x 102.9 g / mol = 728.532 g

theoretical yield = 7.08 mol x 102.9 g / mol = 728.532 g

, Replaced by the definition of percent yield:

percent yield = 728.532 grams / 728.532 grams * 100%

percent yield = 100%

Finally, the percent yield of the reaction is 100%.

FeBr3 is iron bromide. Also known as iron bromide. Iron bromide is an ionic compound in which iron is in a +3 oxidation state.

Learn more about % yield here:https://brainly.com/question/27979178

#SPJ10

Answer: 87%

Explanation:

Initial Activity- What mass of solute will dissolve in 100g of water at the following temperatures?
• KNO3 at 70°C =
• NaCl at 100°C=
• NH4Cl at 90°C=

Answers

The mass of solute will dissolve in 100g of water at the following temperatures will be  153 gms, 40 gms, 70gms simultaneously.

How dissolution of solute is affected by temperature ?

On increasing temperature the amount of solute for dissolution decreases.

It is independent of the nature of solute.

Hence,

KNO₃ at 70degree = 153 gmsNaCl at 100 degree = 40 gmsNH₄Cl at 90 degree = 70gms

Learn more about dissolution here ;

https://brainly.com/question/9949108

#SPJ1

Enter your answer in the provided box. Crystalline silicon has a cubic structure. The unit cell edge length is 543 pm. The density of the solid is 2.33 g/cm3. Calculate the number of Si atoms in one unit cell. atoms/cell

Answers

Based on the calculations, the number of Si atoms in one unit cell is equal to 8 atoms/unit cell.

How to calculate the volume?

Mathematically, the volume of a unit cell can be calculated by using this formula:

V = a³

V = (543)³ × (1 × 10⁻¹²)³ × (100)³

Volume, V = 1.60 × 10⁻²² cm³.

Next, we would determine the mass:

Mass = density × volume

Mass = 2.33 × 1.60 × 10⁻²²

Mass = 3.73 × 10⁻²² grams.

Also, we would determine the mass of one silicon atom:

Mass = 28.09/(6.022 × 10²³)

Mass = 4.665 × 10⁻²³ g/atom.

Now, we can calculate the number of Si atoms in one unit cell:

Number = 3.73 × 10⁻²²/4.665 × 10⁻²³

Number = 8 atoms/unit cell.

Read more on unit cell here: https://brainly.com/question/17218051

#SPJ1

Find the total surface area of the rectangular prism in the figure. A) 174 cm^ 2 B) 522c * m ^ 2; 348c * m ^ 2 D) 432c * m ^ 2

Answers

[tex]\huge\textbf{Hey there!}[/tex]

[tex]\huge\textbf{Better understanding of the lesson}[/tex]

[tex]\text{Formula for finding the area of rectangular prism: \boxed{\mathsf{2(wl + hl + hw) = a}}}\\\text{Whereas, \bf l = \underline{length}, w = \underline{width}, h = \underline{height.}, and a = \underline{area}}[/tex]

[tex]\huge\textbf{Now, let's solve for the given equation}[/tex]

[tex]\mathsf{a = 2\times(8\times6 + 9\times6 + 9\times8)}[/tex]

[tex]\mathsf{a = 2\times(48 + 54 + 72)}[/tex]

[tex]\mathsf{a = 2(48) + 2(54) + 2(72)}[/tex]

[tex]\mathsf{a = 96 + 108 + 144}[/tex]

[tex]\mathsf{a = 204 + 144}[/tex]

[tex]\mathsf{a = 348}[/tex]

[tex]\huge\textbf{Therefore, your answer is: \boxed{\mathsf{348\ cm^2}}}\huge\checkmark[/tex]

[tex]\huge\textbf{Good luck on your assignment \& enjoy}\\\huge\textbf{your day!}[/tex]

~[tex]\frak{Amphitrite1040:)}[/tex]

Changes in which measurements do not shift the equilibrium of a chemical system

Answers

Any Change in the amount of an inert gas into a gas-phase equilibrium at constant volume does not result in a shift of the equilibrium of a chemical system. This follows the equilibrium law.

What is Equilibrium law ?

According to this principle, Adding an inert gas into a gas-phase equilibrium at constant volume does not result in a shift.

This is because the addition of a non-reactive gas does not change the partial pressures of the other gases in the container.


While the total pressure of the system increases, the total pressure does not have any effect on the equilibrium constant.

Learn more about chemical equilibrium here;
https://brainly.com/question/5537989

#SPJ1

How many molecules are contained in 1.55 moles of methane, CH 4 ?

Answers

Avogadro's law states that in one mole of a substance, there are [tex]6.022 \times 10^{23}[/tex] molecules.

This means that in 1.55 moles, there are [tex]1.55(6.022 \times 10^{23})=\boxed{9.33 \times 10^{23} \text{( to 3 sf)}}[/tex]

state three differences between temporary and permanent changes ​

Answers

Answer:

temporary changes are the changes which are there only for a short period if time generally temporary changes are reversible permanent changes are the changes which remain to for longer time and are not reversible

Explanation:

hope it is helpful for

Other Questions
Elian's credit card had a balance of $132.20 on April 1. On April 5, he charged $74.50. On April 18, he made a payment of $52. On April 22, hecharged $18.75 and did not use the credit card the rest of the month. What was his average daily balance? $166.76 $173.45 $206.70 $179.86 how did the nazi soviet pact help advance sin theta = 1/4, tan theta > 0Find cos theta/2 Which of the following is a solution to the equation x[tex]x^{2}[/tex] 6x + 5 = 0? What mental health professionals now call conversion disorder, Freud called What is (4.81 times 10 Superscript 16 Baseline) (1.1 times 10 Superscript negative 4 Baseline) in scientific notation?5.291 times 10 Superscript negative 645.291 times 10 Superscript negative 45.291 times 10 Superscript 125.291 times 10 Superscript 20 1.8(1.1x1.3)1.88=24.02 Which statement best completes the diagram? A.Great Britain organizes colonists into militias.B.Great Britain refuses to sell goods in the colonies.C.Great Britain establishes the Continental Congress.D.Great Britain sends more troops to the colonies. Anyone knows how to do this please tell me how? Which element of a text can contribute to the development of a theme?O the point of viewO the argumentsO the charactersO the writing style Its about creating and Solving Linear Equations by writing linear equations from geometric figures please help Identify the inverse g(x) of the given relation f(x).f(x) = {(8, 3), (4, 1), (0, 1), (4, 3)}g(x) = {(4, 3), (0, 1), (4, 1), (8, 3)}g(x) = {(8, 3), (4, 1), (0, 1), (4, 3)}g(x) = {(8, 3), (4, 1), (0, 1), (4, 3)}g(x) = {(3, 8), (1, 4), (1, 0), (3, 4)} Indicate the number of significant figures in the following measured numbers:a. 45 = __________f. 980.00 = __________b. 450 = __________g. 740000 = __________c. 0.0045 = __________h. 0.00000042 = __________d. 3006 = __________i. 4050600 = __________e. 0.00780 = __________j. 230.0050 = __________ What legislation requires employers to verify the identify of an emplpoyee to be hired what is the median in this list 3 6 9 7 4 6 7 0 7 i need the median the range and the mode ANYTHING HELPS Find the perimeter of the following polygon. Be sure to include the correct unit in your answer. 19 cm 15 cm 14 cm 9 cm 2x+3y=72x - 3y = 4Its asking me to find x Suppose that the weight (in pound) of an airplane is a linear function of the amount of fuel (In gallons) in it's tank. When carrying 20 gallons of fuel, the airplane weighs 2210 pounds. When carrying 54 gallons of fuel, it weighs 2397 pounds. How much does the airplane weigh if it's carrying 60 gallons of fuel? Which statement would least likely be used to describe variation?O Variations are inherited diffrences between individuals of the same species.O Variations that decrease reproductive success are more likely to be passed on.O Variations may result in changes to an entire population after many generations.O Variations provide some individuals with an advantage. The amount of kinetic energy an object has depends on which feature of the object?A) its motionB) its positionC) its gravityD) its height