The amount of energy in kcal produced when 6.5g of O₂ is consumed in the production of magnesium oxide, MgO is –58.26 Kcal
From the question given above, the following data were obtained:
2Mg(s) + O₂(g) → 2MgO(s) ΔH = –1200 kJ
Molar mass of O₂ = 2 × 16 = 32g/mol
Mass of O₂ from the balanced equation = 1 × 32 = 32 g
From the balanced equation above,
32 g of O₂ reacted to produce –1200 KJ.
From the balanced equation above,
32 g of O₂ reacted to produce –1200 KJ
Therefore,
6.5 g of O₂ will react to produce = (6.5 × –1200) /32 = –243.75 KJ
4.184 KJ = 1 Kcal
Therefore,
–243.75 KJ = –243.75 / 4.184
Thus, the amount of energy in kcal produced when 6.5 g of O₂ reacts is –58.26 Kcal
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