5

How many kilojoules are released when 83.6 g of methanol reacts? 2CH: OH(U) + 302(g)-2C02 (g) + AH2 C 0() AH = 726kJAzdNumber of kilojoulesSubmit Request AnswerPart...

Question

How many kilojoules are released when 83.6 g of methanol reacts? 2CH: OH(U) + 302(g)-2C02 (g) + AH2 C 0() AH = 726kJAzdNumber of kilojoulesSubmit Request AnswerPart BHow many kilojoules are absorbed when 312 g of Ca(OH) 2 reacts? Ca(OH)2 (s)_CaO(s) + HzO() AH +65.3kJAzdNumber of kilojoules

How many kilojoules are released when 83.6 g of methanol reacts? 2CH: OH(U) + 302(g)-2C02 (g) + AH2 C 0() AH = 726kJ Azd Number of kilojoules Submit Request Answer Part B How many kilojoules are absorbed when 312 g of Ca(OH) 2 reacts? Ca(OH)2 (s)_CaO(s) + HzO() AH +65.3kJ Azd Number of kilojoules



Answers

Methanol is the fuel in "canned heat" containers (e.g. Sterno) that are used to heat foods at cocktail parties. The combustion of methanol can be described by the following thermochemical equation: $$ \begin{array}{r} 2 \mathrm{CH}_{3} \mathrm{OH}(l)+3 \mathrm{O}_{2}(g) \longrightarrow 2 \mathrm{CO}_{2}(g)+4 \mathrm{H}_{2} \mathrm{O}(g) \\ \Delta H^{\circ}=-1199 \mathrm{~kJ} \end{array} $$ How many kilojoules are liberated by the combustion of $46.0 \mathrm{~g}$ of methanol?

The first part of this question simply wants you to balance the reaction of methanol with oxygen producing carbon dioxide and water. This is a combustion reaction. We see that we have one carbon on this side and with carbon dioxide, we have one carbon here, We have four hydrogen with water. We just have to so we need to put a two on water and then we have 12 34 oxygen's, so we need to put it to in front of the oxygen. Now it's balanced. It says that for every mole of methanol there is 363 killer jewels of energy released because energy is released. This is an excel thermic reaction. To calculate the moles of oxygen required to react with .450 moles of methanol. We simply use the balanced chemical reaction and its coefficient as the mole to mole relationships. We see that for every mole of methanol There are two moles of oxygen required. Therefore, we would need .900 moles of oxygen to react with .45 moles of methanol. And then last of all, if we have 78 g of methanol, we can convert two moles of methanol by divided by the Molar mass methanol. Then we can go from moles of methanol, two moles of carbon dioxide, recognizing the ST geometry of the reaction is 1-1. When we have moles carbon dioxide, we simply multiply by the molar mass carbon dioxide to get grams carbon dioxide, 104 g. Carbon dioxide would be produced from 78 g of methanol undergoing combustion.

So let's look at the combustion of methanol, two moles of methanol and three moles of oxygen can combust and make two moles of carbon dioxide, four moles of water. And in the process, release 1199 killer jewels of energy. Mhm. But what if we didn't use two moles of methanol? What if we use a different amount? Well then the amount of energy that is released would also change. So let's figure out how much methanol would be used If we released 625 killer jewels of energy. So 625 is not 1199. But what you do know about methanol is the fact that if we use two moles, we released that 1199, so every two moles Of CH 30. H. Releases 1199 killer jewels of energy. If we want to know how many grams that was, we could just use molar mass to convert moles to grams and the molar mass of methanol is 32.4 grams, and our killer jewels cancel or moles cancelled. And when you go do the math, you find that if we used 33.4g of CH 30. H, that is the amount of methanol necessary to liberate 625 killer jewels of energy during this reaction.

Hello. Today we'll be talking about Chapter 15 Questions 66 which tells us about an amount of ethanol C two h 50 h, which is the same as regular drinking alcohol. They gets burned, presumably for fuel, and releases a certain amount of energy. And so when we burn this ethanol we released 326.7 kilocalories of energy. We're asked to convert this unit's these units to kill a jewels of energy. And so we first need the conversion factor between cake howls. Killer Jules, which is 4.184 killer Jules, her kilo calorie. So now if we multiply these numbers together 326.7 Killer jewels of energy times 4.184 Uh, killer Jules hopes this is the type of this should be killing calories kilocalories times 4.184 killer jewels for a kilo calorie. Then we get 1367 kilo jewels of energy. And we know this works out because our cake all units above and below the fraction cancel out leaving us with kill it, Jules

Really So this quest questioned replies, Ah, simple unit conversion to get to the answer. So Monty, Low Jew is actually equal toe point. Do it full kilo calories. When it's rounded to our two decimal places, it's equal to tryingto four kilocalories. So in the question, it's mentioned that ah, an ex atomic reaction released 86.5 killer jewels. And in order to convert that two kilo calories, the happy after do is my reply This 8 86.5 pillow George by Why don't you trying to fool kilo calories, parking or jewels? Because this is the ah equivalent off kilocalories per kilo Jew, and then we get the answer. So the units, killer jewels cancel out each other here and, uh, the final on. So when we might apply these numbers ah, is going to be training point seven kilocalories. So this is this is a to six point


Similar Solved Questions

5 answers
29 @61 plcompele2.3.57-GCAgruching Uillly lo grach Ix)-> Ax+4 Or the intcrva | Z4ud JpFrC Datarmine Wrlere ( i icreesing und wherc decreasrigand IcezLUsirc graphing utet, nrphunchoncr01 2 und4sy:10 ChacschnecGnanselecIvour ansuer and Ihen click Check Answer
29 @61 pl compele 2.3.57-GC Agruching Uillly lo grach Ix)-> Ax+4 Or the intcrva | Z4ud JpFrC Datarmine Wrlere ( i icreesing und wherc decreasrig and Icez LUsirc graphing utet, nrph unchoncr 01 2 und 4sy:10 Chacs chnecGnan selecIvour ansuer and Ihen click Check Answer...
5 answers
(1 point) Find the values of for which the series convergesIn nAnswer (in interval notation):
(1 point) Find the values of for which the series converges In n Answer (in interval notation):...
5 answers
Find the measure of the indicated angle to the nearest degree: 19) 20)21)22)23)24)
Find the measure of the indicated angle to the nearest degree: 19) 20) 21) 22) 23) 24)...
5 answers
" 46*2611360p] 124)Azex-Wy _ow
" 4 6*261136 0p] 124) Azex-Wy _ow...
5 answers
An Inverted circular cone shaped tank with base radius 5 _ m and height 2 m is full of water; The water How fost Ihe wator leve being drained at the rate of7 m?fminute: dropping when Ihe water = level in Ihe tank is at hall Its height? GIvo yaur answer an exacl exprossion; Workoheat Rate Iminute
An Inverted circular cone shaped tank with base radius 5 _ m and height 2 m is full of water; The water How fost Ihe wator leve being drained at the rate of7 m?fminute: dropping when Ihe water = level in Ihe tank is at hall Its height? GIvo yaur answer an exacl exprossion; Workoheat Rate Iminute...
3 answers
Which one of the following structures represents the peptide chain? [CBSE 2004](a)(b)(c)(d)
Which one of the following structures represents the peptide chain? [CBSE 2004] (a) (b) (c) (d)...
1 answers
Volume of a hemisphere Derive the formula $V=(2 / 3) \pi R^{3}$ for the volume of a hemisphere of radius $R$ by comparing its cross-sections with the cross-sections of a solid right circular cylinder of radius $R$ and height $R$ from which a solid right circular cone of base radius $R$ and height $R$ has been removed, as suggested by the accompanying figure.
Volume of a hemisphere Derive the formula $V=(2 / 3) \pi R^{3}$ for the volume of a hemisphere of radius $R$ by comparing its cross-sections with the cross-sections of a solid right circular cylinder of radius $R$ and height $R$ from which a solid right circular cone of base radius $R$ and height $...
5 answers
A student mixes $50.0 mathrm{~mL}$ of $1.00 mathrm{M} mathrm{Ba}(mathrm{OH})_{2}$ with $86.4 mathrm{~mL}$ of $0.494 mathrm{M} mathrm{H}_{2} mathrm{SO}_{4}$. Calculate the mass of$mathrm{BaSO}_{4}$ formed and the $mathrm{pH}$ of the mixed solution.
A student mixes $50.0 mathrm{~mL}$ of $1.00 mathrm{M} mathrm{Ba}(mathrm{OH})_{2}$ with $86.4 mathrm{~mL}$ of $0.494 mathrm{M} mathrm{H}_{2} mathrm{SO}_{4}$. Calculate the mass of $mathrm{BaSO}_{4}$ formed and the $mathrm{pH}$ of the mixed solution....
5 answers
When $1 mathrm{~mol}$ of a gas burns at constant pressure, it produces $2418 mathrm{~J}$ of heat and does $5 mathrm{~J}$ of work. Identify $Delta E, Delta H, q$, and $w$ for the process.
When $1 mathrm{~mol}$ of a gas burns at constant pressure, it produces $2418 mathrm{~J}$ of heat and does $5 mathrm{~J}$ of work. Identify $Delta E, Delta H, q$, and $w$ for the process....
5 answers
BONUSI (% point)Whie walking tlow tht Strp" one day; Ancelvendur approaches youa0d wants coloured 0rbe 5200 daming (19 3 gcm ) from your chemista gcla , Rerriember} the derisity gcla ducide Meudure Inc cube consider the uffer . The vondor allows YOU Itis 1,73 cm On B sklu and weitis 75_ Qmns it gcid and shculd you buy Tnere no &edit for {juessinin Yal must maltematically documifng Your ansiwer
BONUSI (% point) Whie walking tlow tht Strp" one day; Ancelvendur approaches youa0d wants coloured 0rbe 5200 daming (19 3 gcm ) from your chemista gcla , Rerriember} the derisity gcla ducide Meudure Inc cube consider the uffer . The vondor allows YOU Itis 1,73 cm On B sklu and weitis 75_ Qmns i...
5 answers
Determine whether each relation defines a function, and give the domain and range.
Determine whether each relation defines a function, and give the domain and range....
5 answers
Use the Table of color indicators' activity ranges to determine which color Indicator Is most suitable for the 5.0X 10 4 M HCI solution. Hint: Calculate the pH of the solution, then choose the indicator that will give @ unique color to that solution.Table 1Uscful pH Range ( Approximate)IndicatorMethyl violetvioletThymol blue Methyl yellowyellowyellow orange-red blugviolet LCongo red Bromcresol greenyellowyellow
Use the Table of color indicators' activity ranges to determine which color Indicator Is most suitable for the 5.0X 10 4 M HCI solution. Hint: Calculate the pH of the solution, then choose the indicator that will give @ unique color to that solution. Table 1 Uscful pH Range ( Approximate) Indic...
5 answers
CnriversOH CiHisOzCI Culyzoz (HJChCHNIz Cialz NOz [taliprolol]HyCOH(H;C)HC-HNCHaH3C_OH(HyC)HC-HNNH-C(CH3)zH3C_OHHsC -NH-CH(CHgl2
cnrivers OH CiHisOzCI Culyzoz (HJChCHNIz Cialz NOz [taliprolol] HyC OH (H;C)HC-HN CHa H3C_ OH (HyC)HC-HN NH-C(CH3)z H3C_ OH HsC - NH-CH(CHgl2...
5 answers
The magnetic flux through a coil of wire containing two loops changes from -16 Wb to +61 Wb in 0.61 $Part AWhat is the emf induced in the coil? Express your answer using two significant figures.AZd8 = 252
The magnetic flux through a coil of wire containing two loops changes from -16 Wb to +61 Wb in 0.61 $ Part A What is the emf induced in the coil? Express your answer using two significant figures. AZd 8 = 252...
5 answers
Which of the following is true for the sample data below? Answers are rounded to one decimal place.Data 0.4 0.4 13.1 3.5 30.3 38.3 13.1 3.5 13.1 4.1I The range of the sample data is 12.II The median of the sample data is 37.9.The sample data is bimodal.
Which of the following is true for the sample data below? Answers are rounded to one decimal place. Data 0.4 0.4 13.1 3.5 30.3 38.3 13.1 3.5 13.1 4.1 I The range of the sample data is 12. II The median of the sample data is 37.9. The sample data is bimodal....
5 answers
The height h kilometres to which a balloon will rise in t minutes is given by the formula:10th = v4000 + t" At what rate is the balloon rising at the end of 30 min.?
The height h kilometres to which a balloon will rise in t minutes is given by the formula: 10t h = v4000 + t" At what rate is the balloon rising at the end of 30 min.?...

-- 0.020831--