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Maslowich
2 years ago
8

In the presence of excess oxygen, methane gas burns in a constant-pressure system to yield carbon dioxide and water: CH4 (g) + 2

O2 (g) → CO2 (g) + 2H2O (l) △H = -890.0 kJ Calculate the value of q (kJ) in this exothermic reaction when 1.80 g of methane is combusted at constant pressure.
Chemistry
1 answer:
djyliett [7]2 years ago
3 0

Answer:

-100.125

Explanation:

We are given

          CH4 (g) + 2O2 (g) → CO2 (g) + 2H2O (l)    △H = -890.0 kJ/mol

The given information is for complete reaction

we have 1.8grams of Methane

Molar mass of CH4 = 16  

No of moles of Methane = 1.8/ 16

                                          = 0.1125

So the amount of the heat will be released from the amount of the methane

Q = No of moles*( -890.0 kJ/mol)

  = 0.1125*(-890)

   = -100.125kJ/mole

Therefore the amount of Energy released from 1.8 grams of methane is equal to -100.125

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3 years ago
A barium hydroxide solution is prepared by dissolving 2.06 g of Ba(OH)2 in water to make 32.9 mL of solution. What is the concen
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Explanation:

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1\times M_1\times 8.50=2\times 0.364\times 15.9\\\\M_1=1.36M

Thus the concentration of the acid is 1.36 M

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