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lesya [120]
3 years ago
6

CH4(g)+ 2 O2(g) + CO2(g) + 2 H20 (l)

Chemistry
1 answer:
jasenka [17]3 years ago
4 0

Answer:

<u>∆H° reaction = -890.3 kJ</u>

Explanation:

The given equation is :

CH_{4}(g)+2O_{2}(g)\rightarrow CO_{2}(g)+2H_{2}O(l)

Now ,

O2 is in the standard state so its  ∆H° is zero.

∆H° is calculated by considering the formation of CO2 , H2O and CH4 .

C(s)+H_{2}(g)\rightarrow CO_{2}..........∆H°a = -393.5 kJ

H_{2}+\frac{1}{2}O_{2}\rightarrow H_{2}O(l).....∆H°b = -285.8 kJ

C+2H_{2}\rightarrow CH_{4}(g)..........∆H°c = -74.8 kJ

Multiply equation of water H2O by 2

and reverse the direction of equation of CH4

Hence the sign of ∆H°c = +74.8 kJ becomes +ve.

We are doing this because CH4 is to be in the reactant side not  in the product side.

∆H° reaction = ∆H°a +2(∆H°b) -∆H°c

∆H° reaction = -393.5 - 2(285.8) + 74.8

∆H° reaction = -890.3 kJ

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RideAnS [48]

Answer:

Protons and neutrons have very similar mass, while electrons are far lighter, approximately 11800 times the mass. Protons are positively charged, neutrons have no electric charge, electrons are negatively charged. The size of the charges is the same, the sign is opposite

Explanation:

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4 years ago
2.) At what temperature in Celsius will a 1.0g sample of neon gas exert a pressure of 500 torr in a 5.01 L container. (Hint: use
Studentka2010 [4]

The required temperature of the sample of gas is 823K.

<h3>What is ideal gas equation?</h3>

Ideal gas equation gives idea about the behavior of gas at different condition & represented as:

PV = nRT, where

  • P = pressure = 500 torr = 0.657 atm
  • V = volume = 5.01 L
  • R = universal gas constant = 0.082 L.atm / K.mol
  • T = temperature = ?
  • n = moles

Moles will be calculated as:
n = W/M, where

  • W = given mass
  • M = molar mass

Moles of Neon gas = 1g / 20.1g/mol = 0.049 mole

On putting all these values in the above equation, we get

T = (0.657)(5.01) / (0.049)(0.082) = 822.8 = 823 K

Hence required temperature of the sample is 823 K.

To know more about ideal gas equation, visit the below link:
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4 0
3 years ago
When NaCl dissolves in water
slava [35]
The sodium ion becomes hydrated. when sodium chloride dissolves in water, the sodium and chloride ions and the polar water molecules are strongly attracted to one another by ion-dipole interactions
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3 years ago
What is the molar mass of ph
masya89 [10]
<span>30.973762 u ± 0.000002 u Hope this Helps >></span>
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3 years ago
6.0 L of gas in a piston at a pressure of 1.0 atm are compressed until the volume
alex41 [277]

Answer:

1.71atm

Explanation:

The following were obtained from the question:

V1 (initial volume) = 6L

P1 (initial pressure) = 1atm

V2 (final volume) = 3.5L

P2 (final pressure) =?

Using the Boyle's law equation:

P1V1 = P2V2, the final pressure can be obtained as follow:

P1V1 = P2V2

1 x 6 = P2 x 3.5

Divide both side by 3.5

P2 = 6/3.5

P2 = 1.71atm

The final i.e the new pressure inside the piston is 1.71atm

6 0
3 years ago
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