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Jet001 [13]
3 years ago
10

3. Sulfur dioxide (SO2) can be reduced by hydrogen disulfide (H2S), producing sulfur in its elemental form and water (H2O). Usin

g Hess’s law and the reactions below, determine the overall enthalpy for the reaction between SO2 and H2S. Make to clearly show your work.
H2 (g) + S (s) → H2S (g) ΔH = –20.6 kJ
SO2 (g) → S (s) + O2 (g) ΔH = +296.8 kJ
2H2 (g) + O2 (g) → 2H2O (g) ΔH = –285.8 kJ
Chemistry
1 answer:
Dafna1 [17]3 years ago
8 0
The reaction between h2s and so2 results to h20 and elemental sulfur. The final reaction is SO2 +2H2S = 3S+ 2H2O. Using Hess law, the first equation is reversed and multiplied by 2, the second and the third equation remains the same. Calculating the overall enthalpy, the answer is 52.2 kJ. 
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A certain rifle bullet has a mass of 8.13 g. Calculate the de Broglie wavelength of the bullet traveling at 1337 miles per hour.
bogdanovich [222]

Mass of the bullet (m) = 8.13 g = 0.00813 kg

velocity of the bullet (v) = 1337 miles/hr

The de Broglie wavelength (∧) of an object of mass (m) travelling at a velocity (v) is given as:

∧ = h/m*v

where h = Planck's constant = 6.626 *10^-34 kgm2/s

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7 0
3 years ago
Read 2 more answers
A technician experimentally determined the boiling point of octane to be 124.1°C. The actual boiling point of octane is 125.7°C.
kramer

Percent error=(experimentally determined boiling point-actual boiling point)

                   =(124.1 - 125.7) = 1.6 °C

Percentage error is \frac{1.6\times 100}{125.7} = 1.27%

Quantity                   Number of significant figures

0.070020 meter                     5

10,800 meters                        5

0.010 square meter               2

5.00 cubic meters                  1

507 thumbtacks                     3

 (5.3 x 10⁴) + (1.3 x 10⁴) =6.6 x 10⁴

(7.2 x 10⁻⁴) ÷ (1.8 x 10³)=4 x 10⁻⁷

10⁴ x 10⁻³ x 10⁶=10⁷

(9.12 x 10⁻¹) - (4.7 x 10⁻²)=(9.12 x 10⁻²) - (4.7 x 10⁻²)

                                          =(91.2-4.7)  x 10⁻²

                                           =85.5 x 10⁻²

5 0
3 years ago
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