Question

Use the combustion of methane for the following question:

CH₄ (g) +        O₂ (g) → CO₂ (g) +         H₂O (l)                    ∆H = -890 kJ/mol

A)Is the reaction exothermic or endothermic?

B)If I combust 2 mol of methane, how much heat is absorbed or released - use the appropriate sign to indicate in your answer.

C) If I combust 12.5 g of methane, how much energy in kJ is absorbed or released? Use the appropriate sign in your answer.

Answer 1

thank you vmuch....

Balanced Equation fre combustion of methane is CHugo +202 (g) - CO2 g +2.H₂O At= - 89015]/mol. A As AH has negative sion, it is exothermic reaction. B for 1 mole of Ctly combustion AH = - 890 BJ 2 mole of Catlong >AH=2x-390 = -188065 u. At=- 1780 kJ for a mole of CHop combustion. moks - of Cathely) = 12.5 = mous 12.5 1 0.78 13 mole f or molas mass of ctty 16 Imole of Cette (9) - At = - 890 kJ for 0.7813 mole of otly - H = 0.18 13 x - 290-695.3k. for 12.5g of cotly - AH = -695.3 KT ce cf Now, .