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xeze [42]
4 years ago
6

calculate and compare the chemical energy of coal to its gravitational potential energy. Burning 1 kg of coal releases about 3 m

illion joules of energy. if you could use all of the chemical energy to lift another kilogram of coal, how could you lift it?
Chemistry
1 answer:
RSB [31]4 years ago
5 0

Answer:

Explanation:

1 kg of coal releases 3 million joules of energy

energy released = 3 x 10⁶ Joules

This energy will be in the form of chemical energy .

This energy is being used ti lift 1 kg of coal . Let height attained be h .

Gravitational potential energy of coal at height h = mgh where m is mass of the coal , g is gravitational acceleration .

chemical energy = gravitational energy

mgh = 3 x 10⁶

1 x 10 x h = 3 x 10⁶

h = 3 x 10⁵ m

= 300 x 10³ m

= 300 km .

so , 1 kg coal can be lifted by 300 km .

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A gaseous mixture at 265K and 1.0 atm contains 25 O2 60 N2 and 15 CO2 mole basis The velocities of the components are 0.084 cm s
Free_Kalibri [48]

Answer:

The molar average velocity is 0.0588 cm/s

The N₂ diffusion velocity relative to the mole average velocity is -0.1428 cm/s

The molar diffusional flux of N₂ is -3.9x10⁻³

Explanation:

Given data:

T = temperature = 265 K

O₂ = 25%

N₂ = 60%

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vO₂ = -0.084 cm/s

vN₂ = 0.12 cm/s

vCO₂ = 0.052 cm/s

The molar average velocity is equal:

v_{av} =(0.25*(-0.084))+(0.6*0.12)+(0.15*0.052)=0.0588cm/s

The N₂ diffusion velocity relative to the molar average velocity is:

v_{i} -v_{av} =-0.084-0.0588=-0.1428cm/s

The molar diffusional flux of N₂ is:

N_{N_{2} } =\frac{P}{RT} y_{A} (v_{i} -v_{av} )=-3.9x10^{-3}

8 0
4 years ago
The equation for the complete combustion of ethane (C2H4) is
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-6x -8y = 28
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