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MHT CET Chemistry question

ChemistryThermodynamicsMHT CET

Values of heats of formation for and MgO are and kJ respectively. The heat of the reaction \mathrm{2Mg_{(s)} + SiO_{2(s)} \rightarrow 2MgO_{(s)} + Si_{(s)}} is

Answer: (B)

Solution

= 2(-34.7) - (-48.4) = -69.4 + 48.4 = -21.0 kJ (elements have zero heat of

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Question ID VK-064473