10. When 10 g of metallic sodium interacts with water, ΔrH0298 = -79.91 kJ, and when 20 g of sodium oxide interacts with water, ΔrH0298 = -76.76 kJ. Water is taken in large excess. Calculate the heat of formation of sodium oxide if ΔH0298(H2Oж) = -285.8 kJ*mol-1

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