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1. ### Chemistry Question?

...mol ions / 1 mol Mg3(C6H5O7)2) x (0.082057338 L atm/K mol) x (37 + 273) K = 29.5 atm

1 Answers · Science & Mathematics · 15/09/2019

2. ### How much energy (in kilojoules) is released when 20.5 g of ethanol vapor at 97.5 ∘C is cooled to -17.0 ∘C?

...from condensing the vapor (113 J/(K⋅mol)) x (78.4 - (-17.0))K x (0.445 mol) = 4797.189 J = 4.797 kJ from cooling the liquid to -17.0 ∘C 0.558 kJ + 17.159 kJ + 4.797 kJ = 22.5 kJ total

1 Answers · Science & Mathematics · 09/09/2019

3. ### A balloon filled with 51.8 L of He at 18.6 ∘C and 1.00 atm rises to a height in the atmosphere where the pressure is 207 Torr and the?

...torr. The temperature must be in ˚K. To convert ˚C to ˚K, add 273˚ T1 = 18.6 + 273 = 291.6˚K T2 = -32...

2 Answers · Science & Mathematics · 08/09/2019

4. ### The elements contained in acetylsalicylic acid, the active ingredient in aspirin, are carbon, hydrogen, and oxygen. The combustion of 4.000g?

...987 atm) x (3.87 L) / ((0.082057338 L atm/K mol) x (25 + 273) K) = 0.1562 mol CO2 (0.1562 mol CO2) (1 mol C / 1 mol CO2) × (12.01078 g C/mol) = 1.876 g C (1.300 g ...

1 Answers · Science & Mathematics · 04/09/2019

5. ### Thermochemistry. How many kilojoules are needed?

Thermochemistry .... q = moles x molar heat capacity x ΔT + moles x molar heat of vaporization q = 1.056 mol x 0.1124 kJ/molK x 25K + 1.056 mol x 38.56 kJ/mol q = 43.7 kJ The 2015 kJ comes from using 48.7...

3 Answers · Science & Mathematics · 27/08/2019

6. ### Chem problem?

(21.56 + 273.15) K x (767 mmHg / 725 mmHg) = 311.7829 K (311.7828 K - 273.15 K) = 38.63°C

4 Answers · Science & Mathematics · 06/08/2019

7. ### Calculate the standard potential, ∘, for this reaction from its equilibrium constant at 298 K. X(s)+Y4+(aq)↽−−⇀X4(aq)+Y(s) =9.83×10−8?

... E° = (8.314 J/molK x 298K / 4 / 96,458 C/mol) ln 9.82x10^-8 E° = -1.04V The negative cell potential ...

1 Answers · Science & Mathematics · 07/08/2019

8. ### Chemistry Lab?

...the pressure and volume are inversely proportional: PV = k. The product of the pressure and volume should be the same... = -0.803 / 0.003 ....... when P = 0 T = -268 C Percent error = |(-273 - (-268)) / -273| x 100 = 1.83% .

2 Answers · Science & Mathematics · 03/08/2019

9. ### Nine (9.0) liters of fluorine gas is heated from 250 K to 370 K.?

... constant and cancel it .. (4) plug and chug.... remember T must be absolute.. K or R.. never °C nor °F you do that and you don't need to remember boyles law, charles...

3 Answers · Science & Mathematics · 31/07/2019

10. ### Chem question?

(38.6 + 273.15) K x (0.798 L / 4.64 L) x ((125 kPa x 7.50062 torr/kPa) / 685 torr) = 73.385 K = -200.°C

2 Answers · Science & Mathematics · 26/07/2019