What is the empirical of compound (X) going through the following decomposition reaction?

77,997 results, page 81

Chemistry

Upon decomposition, one sample of magnesium fluoride produced 1.65kg of magnesium and 2.58kg of fluorine. A second sample produced 1.38kg of magnesium. How much fluorine (in grams) did the second sample produce?

chemistry

Upon decomposition, one sample of magnesium fluoride produced 1.66kg of magnesium and 2.56kg of fluorine. A second sample produced 1.29kg of magnesium. How much fluorine (in grams) did the second sample produce?

Statistics

I'm confused about the difference between the population and experimental units in a situation like the following: A questionnaire is being used to measure the reaction of two groups of students from a particular American university to a television clip: one group who knows it...

chemistry

how do i solve the following problem? Nitrogen dioxide decomposes to nitric oxide and oxygen via the reaction: 2NO2 → 2NO + O2 In a particular experiment at 300°C, [NO2] drops from 0.0100 to 0.00650 M in 100 s. The rate of Disappearance of NO2 for this period is ...

Chemistry

In the following reaction, how many liters of carbon dioxide will be produced if 250 liters of oxygen is used in the combustion of sucrose given that both gases are at STP? C12H22O11 + 1202 -> 12CO2 + 11H2O I have had other ones in my homework that were very easy but this ...

Lit

I have an essay and this is one part of my thesis... "In the nineteenth century, some ways the middle class participated in revolutions was by establishing liberalism, one way was through literature, and through the revolutions of 1848." I wasn't sure if the "one way was ...

English

I have an essay and this is one part of my thesis... "In the nineteenth century, some ways the middle class participated in revolutions was by establishing liberalism, one way was through literature, and through the revolutions of 1848." I wasn't sure if the "one way was ...

Chem II

Kp for the reaction CaCO3 <---> CaO + CO2 at 350 degrees C is 0.105. Kc for the reaction at the same temp is _____. This is what I did. I changed all the moles into M. Then I subbed everything into the Kc formula and then changed it into a quadratic. Then everything ...

chemistry

If a precipitation reaction occurs when a solution of one species is added to a solution of the other, enter the formulas and states of all products. Separate by comma. If there is no reaction, enter the formula and state of all ions in solution. magnesium chloride + silver ...

chemistry

If a precipitation reaction occurs when a solution of one species is added to a solution of the other, enter the formulas and states of all products. Separate by comma. If there is no reaction, enter the formula and state of all ions in solution. aluminum sulfate + lead(II) ...

Chemistry

Nitrogen monoxide reacts with chlorine gas according to the reaction: 2NO (g) + Cl2 (g) ⇔ 2NOCl (g) Kp = 0.27 at 700 K A reaction mixture initially contains equal partial pressures of NO and Cl2 . At equilibrium, the partial pressure of NOCl is 115 torr. What were the ...

Organic Chemistry

The purpose of adding concentrated H2SO4 to the Diels-Alder adduct was to: A. hydrolyze the product to make the product precipitate more easily B. catalyze the diels alder reaction C. use Le Chatelier’s principle to drive the reaction to completion D. to quench excess ...

business statistics

using empirical formula a company is studying the number of daily debit card purchases. THere were 20 purchases and the probability of a debit card purchase is 0.5. what is the stadnard deviation of the number of debit card purchases

Chemistry

Oops I posted the right question but wrong answer options... What mass of propane (C3H8) is needed to produce 346g carbon dioxide in the following reaction? C3H8(g)+5O2(g)->3CO2(g)+4H2O(g) A. 346g C3H8 B. 115g C3H8 C. 5075g C3H8 D. 1.86g C3H8

physics

A string is wound is tightly around a wheel. When the end of the string is pulled through a distance of 10 cm, the wheel rotates through 5 revolutions. What is the radius of the wheel?

math

a) Determine an equation for the line with slope 3 and passing through the origin. b) What is an equation for the line perpendicular to the line in part a) that also passes through the point (0,2)?

Physics 2

A beam of light is incident on a plane mirror at an angle of 35¨¬. If the mirror rotates through a small angle ¥è through what angle will the reflected ray rotate

CHEMISTRY!!/science

A mixture of CO2 and an unknown gas was allowed to effuse from a container. The carbon dioxide took 1.25 times longer than the unknown gas to escape.Which of the following gases could the unknown one be Choices A: Cl2 B: CO C: HCl D: H2 E: SO2 I am going B for this reason: CO2...

Jade

1. Spectroscopic studies of the reaction of azide ion with the cluster [Ru3(CO)12] in acetone solvent confirmed the occurrence of process (i) under a CO atmosphere. Kinetic measurements of this rapid [Ru3(CO)12]+ N3– →[Ru3(NCO)(CO)11]–+ N2(i) reaction revealed the ...

Chemistry Help

1. Spectroscopic studies of the reaction of azide ion with the cluster [Ru3(CO)12] in acetone solvent confirmed the occurrence of process (i) under a CO atmosphere. Kinetic measurements of this rapid [Ru3(CO)12]+ N3– →[Ru3(NCO)(CO)11]–+ N2(i) reaction revealed the ...

english

I have to write a thoughtful composition on the following: Gothic novels emphasize horror, mystery, and the supernatural. Write an analysis of the gothic features of the nvel Frankenstein that are evident in Chapters 1 through 8. How does she Shelley establish an atmosphere of...

science

How would you balance this reaction(it's a half reaction problem): H2O2+ClO2-->ClO2+O2 (basic solution) thanks. i'm just confused b/c its a basic solution. all i know is that you have to add OH to it or something. thanks again for helping. add OH and you will get H2O as a ...

chemistry

The National Institute of Science and Technology (NIST) kinetics database lists the rate constant, k, of a particular gaseous reaction as 8.56× 10–10 cm3·molecule–1·s –1 at 298 K. convert to units of M-1 s-1. convert rate constant to units of Torr-1 s-1. What is the ...

Chemistry

The reaction: H2C2O4 + CuO + Heat = ? This reaction was produced in organic elemental analysis to identify C and H. So I think CO2 is formed to react with Ca(OH)2 to giving CaCO3. Additionally was formed H2O, so I though H2 or H2O was produced. Is correct : = C2CuO4 + CO2 + H2 ?

chemisery

What is the equilibrium constant for the reaction taking place at room temperature (T = 25◦C) in the battery Zn(s)| Zn2+(aq)|| Ce4+(aq)| Ce3+(aq) ? Assume that the number of electrons transferred in the reaction is n = 2. Zn2+ + 2 e − → Zn E ◦ red = −0.76 V Ce4+ + e...

Chemistry

What is the minimum amount of 6.6 M H2SO4 necessary to produce 22.6 g of H2 (g) according to the following reaction? 2Al(s)+3H2SO4(aq)→Al2(SO4)3(aq)+3H2(g) I need to find the volume of the H2SO4 Work: 22.6g H2 /2.008g H2 = 11.3 mol H2 11.3 mol H2 * (3molH2SO4/3molH2) * (...

childcar

1. The children in your class are working on an art oriojectthat requiresthe children to use a standard hair dryuer . Of the following locations, whioch one woukld be the safest place to put the hair dreyer while the children are working o the project? A. On the countertop B. ...

Chemistry

A solution contains 0.0653g of compound in 8.31g of ethanol. The molarity of the solution is 0.0368m. Calculate the molecular weight of the compound For Further Reading Chemisty - drbob222, Thursday, February 7, 2008 at 9:40pm The molarity of the solution can't be 0.0368 m. It...

ENG DESP HELP PLEASE

Are these corret! tahnk you so much review for test! are my answers correct 1. Several people listened, but nobody voluntered??? simple 2. Gina and Sam picked the wildflowers, and we arranged them??? simple 3. Snow fell: winter was now upon us?? compound 4. Mrs Smith may be in...

AP Chem (Conceptual Questions)

Hey guys! If you could just please, look over a few of these conceptual problems because I'm pretty confused? (I put what I think is the answer below each question). Thank you for any help in advance!!!! A.Which statement *does not* apply to a heterogeneous catalyst? 1.It is ...

English

1. I'm going to try an English club. 2. I am going to join an English club. (When we use 'try' as in #1, what is the difference between 'try' and 'join'?)

Physics

A small crack occurs at the base of a 13.5 m high dam. The effective crack area through which water leaves is 1.55 10-3 m2. (a) Ignoring viscous losses, what is the speed of water flowing through the crack?

Physics

A small crack occurs at the base of a 13.5 m high dam. The effective crack area through which water leaves is 1.55 10-3 m2. (a) Ignoring viscous losses, what is the speed of water flowing through the crack?

Physics

A small crack occurs at the base of a 13.5 m high dam. The effective crack area through which water leaves is 1.55 10-3 m2. (a) Ignoring viscous losses, what is the speed of water flowing through the crack?

O. Chemistry (Nucleophilic Substitution)

1. Explain why the reagent NaI in acetone encourages SN2 reactions. Provide another nucleophile/solvent combination that encourages SN2. What characteristics will each have? 2. Write the complete mechanism for the reaction of (3S, 4R) 3-bromo-3,4-dimethylhexane with methanol. ...

Chemistry

1) A double displacement reaction takes place when aqueous sodium carbonate reacts with aqueous tin (II) nitrate. You would expect one of the products of this reaction to be. Answer: Sn(CO3)2 2) For the reaction, 3 Cu + 8HNO3 --> 3Cu(NO3)2 + 2NO + 4H2O, if you could drop 12...

Biology HELP!

Which of the following is true? Mark all that apply. (2 points) A hypothesis can be proved incorrect through experiment. Conclusions cannot disprove a hypothesis. Conclusions are made based on the analysis of data. Opinion is used to analyze data. A/D

chemistry

I, IV and V only 005 10.0 points When a chemical reaction comes to equilibrium, both the forward and the reverse reactions continue, but their rates are equal. For such a system at equilibrium at 300 K and 1.00 atm pressure, the change in Gibbs free energy as the forward ...

Redox Reaction

In an acidic solution, manganese(II) ion is oxidized to permanganate ion by bismuthate ion, BiO3-. In the reaction, BiO3- is reduced to Bi3+. How many milligrams of NaBiO3 are needed to oxidize the manganese in 30.2 mg of manganese(II) sulfate?

Chemistry

1) The formation of water is represented by the following equation : 2H2(g) + O2(g) -> 2H2O(g) a.What is the limiting reactant if 4 mol of oxygen reacts with 16 mol of hydrogen? b.What amount (in moles) of water is produced in this reaction? 2) . Sliver nitrate, AgNO3(aq),...

Statistics

Ten cards, the 2 through 6 of spades and the 2 through the 6 of diamonds, are shuffled thoroughly and then taken one by one from the top of the deck and placed on the table. How many arrangements are possible? What is the probability that each card is next to a card bearing ...

college physics

The intensity of an earthquake wave passing through the Earth is measured to be 2.5×10^6 J/m^2 at a distance of 43 km from the source. What was its intensity when it passed a point only 2.0 km from the source? AND At what rate did energy pass through an area of 4.0 m^2 at 2.0...

Trigonometry/ please help!

Assume that simple harmonic motion of a spring is described by the equation S=4 cos πt/ 2 where s is in centimetres and t is in seconds. When during the time 0<=t<=8 is the spring passing through the origin? I attempted this question but the graph doesn't pass ...

chemistry

What is the coefficient of oxygen in the following equation for the reaction of potassium (K) with oxygen (O2) to form potassium oxide (K2O? __ K + ___ O2 -> ___ K2O is it 4, 3, 2, or 1?

Science

A chemist notes that a solution turns blue when a chemical reaction takes place. Which of the following correctly describes the chemist's data? A.The data is a qualitative observation*** B.The data is a quantitative observation C.The data is a prediction D.The data is a ...

Chem 30

1) Suppose the mass of the NaOH used in a reaction was doubled. What would you expect to happen to the heat given off by the reaction? Explain your answer. 2)Again, suppose the mass of the NaOH used in a reaction was doubled. What would you expect to happen to the heat given ...

language

which of the following answer choices contains a metaphor? A) his skin was sand paper B) the sun sparkled like a diamond C) she wanted to be like the birds and fly away D) they felt free when they ran through the door im not trying to cheat i just need serious help! ~ Kakashi ...

Chemistry

A reaction was performed in which 0.47 g of 2-naphthol was reacted with a slight excess of 1-bromobutane to make 0.29 g of 2-butoxynaphthalene. Calculate the theoretical yield and percent yield for this reaction. 2-naphthol + 1-bromobutane --> 2-butoxynaphthalene

chemistry calculations

At some temperature, the reaction PCl3(g)+Cl2(g)====PCl5(g) is at equilibrium when the concentration of PCl3, Cl2, and PCl5 are 10, 9.0, and 12 mol/L, respectively. Calculate the value of Kc for this reaction at that temperature.

chemistry calculations

At some temperature,the reaction PCl3(g) +Cl2(g) ====PCl5(g) is at equilibrium when the concentration of PCl3, Cl2, and PCl5 are 10, 9.0, and 12mol/L, respectively. Calculate the value of Kc for this reaction at that temperature.

Chemistry

O3 + NO --> O2 + NO2 (all in gas state) Calculate the change in enthalpy for the reaction at room temp. using the following data ^Hf: O3 = 143 NO = 90 NO2 = 33 So, I have 143+90--> X + 33. I don't know what the enthalpy of O2 is. I assume you simply subtract the enthalpy...

Chemistry(Please check)

1) The reaction: A + 3B = D + F was studied and the following mechanism was finally determined A+B=C (fast) C+B=D+E (slow) E+B=F (very fast) Which step has the largest activation energy? I chose the second step because it is slow and should have the most energy. Is this correct?

Chemistry

How many moles of hydrogen gas are required to react completely with 807 L of ethylene (C2H4) according to the following reaction at 0oC and 1 atm? hydrogen (g) + ethylene (C2H4) (g)---> ethane (C2H6) (g) Should I use the ideal gas law here?

Biology

Which of the following is true of an exergonic chemical reaction? A.Reactants lose mass as products are reformed B.Bonds are broken in reactants and new bonds are formed in products C.No activation energy is required to initiate it D.The energy released is captured by a catalyst

chemistry

The equilibrium constant (Kc) for the gas phase reaction 2 NH3 N2 + 3 H2 is 3.0 x 10-3 at some temperature. The reaction is started by placing a 0.040-mol sample of ammonia in an empty one-liter flask. When equilibrium is established how much N2 is present? 1. ) 0.019 mol 2...

Math help plz

The human endocrine system is made up of which of the following structures? (1 point) vessels receptors glands chambers 2. Which of the following best describes the function of the endocrine system? (1 point) It secretes chemical messengers that travel through the blood to ...

Psychology 220

1.68 (1 pts.) In order to evaluate the effectiveness of a new psychotherapeutic technique, Dr. Schwartz is testing the therapy on clients that have sought treatment from him at his private practice. According to Martin Seligman, Dr. Schwartz is conducting an A) epidemiological...

Chemistry

I need help on this stoichiometry problem. I don't know whay my answer is incorrect. The fermentation of sugar to produce ethyl alcohol occurs by the following reaction: C6H12O6 -- 2C2H5OH + 2CO2 What mass of ethyl alcohol can be made from 1.00 kg of sugar? I keep getting 1012...

chemistry

Sodium chloride is formed by the following reaction: NaOH + HCl --> NaCl + H2O How many grams of water are formed when 10 g of HCl is consumed? Round your answer to one decimal place, do not include units or commas. use the molar masses in your text to two decimal places.

Chemistry

Write a balanced equation for the following reaction. Use whole number coefficients and subscripts as appropriate. Carbon tetrachloride is an industrial liquid solvent. It is made by combining methane gas with elemental chlorine. These react to form carbon tetrachloride and ...

Chemistry

Calculate the standard enthalpy change for the reaction 2A+B⇌2C+2D Use the following data: Substance ΔH∘f (kJ/mol) A -247 B -375 C 191 D -483 Express your answer to three significant figures and include the appropriate units. My answer was 285 kJ/mol but mastering ...

Physics

1)Put the types of radiation of the electromagnetic spectrum in order from: a)longest to shortest wavelength b)greatest to lowest energy c)slowest to fastest speed A)radio,microwave,infrared,light,x-rays,gamma rays B)gamma-rays,infrared,light,microwave,radio I couldn't find C...

chem

For this problem, will someone please check my answer? How many grams of oxygen are produced in the decomposition of 5.00g of potassium chlorate? KClO3(s)--->KCl(s)+O2(g) [the equation may not be balanced] My answer is 1.96 g of O2. The balanced equation is 2KClO3 ==> ...

Chemistry

I don't really understand these questions and their processes. And I am a bit iffy on redox reactions. For problem 3, can you show a step by step process how to do the problem? Problem 2, I do not fully understand how to do it at all. How would you know the resulted products? ...

algbra

Graph the following equations; calculate the slope, x-intercept, and y-intercept, and label the intercepts on the graph. Find an equation in slope-intercept form passing through the points (-6.2,18.1) and (-3.4,18.1).

English

Hello I need some help please I am preparing myself for ma MA degree.I am writing about Native Americans and need some help with the formation of the title of my paper. My topic is going to be about the book Fools Crow and I am going to write about the history of the relations...

math

I need help with these questions please. Could someone please check them for me? Thank You. 1. Jane Hilman went to her bank. She had a balance of $1,009.88 in her savings account. She withdrew $130.00 and the teller credited her account with $6.19 What is her new balance. is ...

physics

a car travels on a straight road. a) starting from rest, the car is going 44 ft/s (30 mi/h) at the end of 5.0 s. What is the car's average acceleration in ft/s^2 b) in 4.0 more seconds, the car is going 88 ft/s (60 mi/h). what is the car's average acceleration for this time ...

Chemistry

Calculate the work involved if a reaction with an enthalpy change of -2418 kJ is carried out in a vessel with a mobile, frictionless piston. Other details: the reaction is H2(g) + 1/2Oxygen2(g) yields H2O(g) with enthalpy change of -241.8 kJ/mol. The product is 180.16gH2O=10....

Cemistry

If you have a chemical reaction in equilibrium and add more of the product...what happens to the product's concentration, if it doesn't increase? Does it stay the same or decrease a little? I know the reactants concentration will increase and if it is an endothermic reaction ...

? on Chemistry

If you have a chemical reaction in equilibrium and add more of the product...what happens to the product's concentration, if it doesn't increase? Does it stay the same or decrease a little? I know the reactants concentration will increase and if it is an endothermic reaction ...

chemistry

Draw an energy profile describing an exothermic reaction and label the energy activation and change of heat components of the profle. Calculate the change in heat when 6.00g of 2Cl2 are used in the reaction. Change of heat= -118.3 kcal/mol.

Chemistry

The net reaction in a voltaic cell with Eºcell= +.726V 2Fe^3+(aq) + 3Zn(s) --> 2Fe(s) + 3Zn^2+(aq) What is the delta Gº for this reaction at 25ºC I tries using this equation: delta G = -nFEºcell = -n(90485)(.726) However, I don't know how to calculate n in this. I ...

Chemistry

If the initial pressure of NH3(g) is 0.7317 atm, calculate the % of NH3(g) left over after the reaction reaches equilibrium according to the balanced equation. The value of Kp at 500.0 °C is 67100.00. The initial pressure of the reaction products is 0 atm. 2NH3(g) = N2(g)+3H2(g)

chemistry

The reaction CH3- N≡C → CH3- C≡N is a first-order reaction. At 230.3°C, k = 6.29 x 10^-4 s^- 1. If [CH3 -N≡ is 1.00 x 10^-3 initially, C] [CH3-N ≡ C] is __________ after 1.000 x 10^3 s. A) 5.33 x 10^-4 B) 1.00 x 10^-6 C) 4.27 x 10^-3 D) 2.34 x 10...

Chemistry

If the initial concentration of BrCl(g) is 4.680 mol/L, calculate the % of BrCl(g) left over after the reaction reaches equilibrium according to the balanced equation. The value of Kc at 500.0 K is 32.00. The initial concentration of the reaction products is 0 mol/L. 2BrCl(g...

math/Check!

okay so the question is as follows: determien the standard form of the equation of a hyperbola with vertices(+or- 2,0) and passing through (4,3) is this right? x^2/2^2 - y^2/b^2 =1 Since P(4,3) passes through, the x and y coordinates satisfy the equation: 4^2/2^2 - 3^2/b^2 =1 ...

math/check!

okay so the question is as follows: determien the standard form of the equation of a hyperbola with vertices(+or- 2,0) and passing through (4,3) is this right? x^2/2^2 - y^2/b^2 =1 Since P(4,3) passes through, the x and y coordinates satisfy the equation: 4^2/2^2 - 3^2/b^2 =1 ...

science

I'm posting this again because the answer I got last time made no sense to me. Peter looked on his cereal box, he saw that it read 'contains added iron.' Peter wanted to see the iron in his food. Peter got out a magnet, and the iron came to the top of the flakes. They were ...

Physics

I have to design an experiment to measure the speed of sound. We're given a tape measure and a stopwatch. The temperature of the air will be measured too. So I know you're probably not going to tell me (one of the ways) how to do it, but do you have any hints? The only thing I...

Chemistry

Upon decomposition, one sample of magnesium fluoride produced 1.65kg of magnesium and 2.58kg of fluorine. A second sample produced 1.50 kg of magnesium. How much fluorine (in grams) did the second sample produce?

chemistry check

1. 48 KNO3+ _ C 12 H22O11-„³ ? CO2+ _ N2+ _ K2CO3+ _ H2O a. 12 b. 24 s c. 36 d. 48 The reaction is 48 KNO3 + 5 C12H22O11 --> 24 K2CO3 + 36 CO2 + 55 H2O + 24 N2 So the answer is C =36 2. 6 KNO3+ _ S + ? H2O„³ _ H2SO4+ _ N2+ _ K2SO4 a. 2 b. 4 c. 6 d. 8 The balanced ...

chemistry

what are the valences expected in unuhexium? the outer is 7s2 7p4 The valency is 6 how do i find the highest hydride and highest fluoride of ununhexium as i have to give an empirical formulae one confused student thank you but could you please explain how you achieve that with...

physics

A Ferris wheel with radius 14.0 m is turning about a horizontal axis through its center, as shown in the figure below. The linear speed of a passenger on the rim is constant and equal to 6.00 m/s. A.What is the magnitude of the passenger's acceleration as she passes through ...

physics

A Ferris wheel with radius 14.0 m is turning about a horizontal axis through its center, as shown in the figure below. The linear speed of a passenger on the rim is constant and equal to 6.00 m/s. A.What is the magnitude of the passenger's acceleration as she passes through ...

English

1. What are you going to do tomorrow? I'm going to a concert. I am going to go to a concert. I will go to a concert. I go to a concert. (Are all answers correct?) 2. He ate a piece of toast. He ate a slice of toast. He ate a bit of toast. (Are all the same and correct? Can we ...

Chemistry

Complete and balance the equation for this reaction in basic solution? Redox reaction Cr is oxidized to CrO42– and Fe3 is reduced to Fe2...? For a particular redox reaction Cr is oxidized to CrO42– and Fe3 is reduced to Fe2 . Complete and balance the equation for this ...

algebra

Graph the following equation: clculte the slope, x-intercept, and y-intercept, and label the the intercelts on the graph. problem: Find an equationin slope-intercept form passing through the points (2,5) and ( 7,-3).

chemistry Please Help Dr.BOB

Complete hydrolysis of 25 mM ethyl acetate in an enzyme (i.e., esterase)-catalyzed reaction is carried out in a 40 mM NaCl solution buffered by 0.2 M Tris-Cl, pH 9.1. What is the pH at the end of the reaction? (For Tris base, which is the abbreviation for Tris (hydroxymethyl) ...

chemistry

The reaction of fluorine with ammonia produces dinitrogen tetra fluoride and hydrogen fluorida. 5F2(g)+2NH(g)---> N2F4(g)+6HF(g) A. If you have 66.6gNH3, how many grams of F2 are required for a complete reaction? B. how many grams of NH3 are required to produce 4.65g HFCS? ...

Physics

During a neighborhood baseball game in a vacant lot, a particularly wild hit sends a 148-g baseball crashing through the pane of a second-floor window in a nearby building. The ball strikes the glass at 10.1 m/s, shatters the glass as it passes through, and leaves the window ...

ChEMistry

a binary compound between germanium and bromine would have a formula like: (a)

ap chemistry

How can I calculate the exothermic lattice energy when all I am given is the compound formula LiF?

chemistry

1-ACETOXY-1,3-BUTADIENE which of the funtional groups exist in the compound above? a. Ketone b. Aldehyde

Chemistry

In fluorescence, why do we have to preapre a calibaration curve for every compound in our sample?

Chemistry

In fluorescence, why do we have to preapre a calibaration curve for every compound in our sample?

4th grade english

inside=________+__________ head top from (compound words)

Chemistry

how many electrons pairs surround an atom of boron (B,element 5) bonded in the compound BCI3?

Chemistry II

what is the molar mass of a gaseous organic compound with a density of 3.38 g/L at 40oC and a pressure of 1.97 atm?

trigonometry

Use a compound angle formula for cosine to show that cos2x = cos^2x - sin^2x

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