Delta H degree is -1204 kJ at 25 degree C for the reaction 2 Mg(s) + O_2(g) righ

Question

Delta H degree is -1204 kJ at 25 degree C for the reaction 2 Mg(s) + O_2(g) rightarrow 2 MgO(s) (a) Find the amount of heat transferred when 16.5 g of Mg reacts at 25 degree C and 1 atm. (b) does this heat flow to the surroundings or into the system? Delta H_f degree for H_2O(l) is the enthalpy change for a certain chemical reaction. Write this reaction. You must include s, l, g for the substances. What is the main caUse of the current increase in the amount of carbon dioxide in the earth's atmosphere? The rotational energy levels of a certain molecule are given by the formula

Explanation / Answer

24)

a)
since delta H is negaitive, reaction is exothermic and heat flows to the surrounding

when 2 mol of Mg reacts, heat transferred = 1204 KJ
2 mol of Mg = 2*24.3 g = 48.6 g

when 48.6 g of Mg reacts, heat transferred = 1204 KJ
when 16.5 g Mg reacts, heat transferred = 1204*16.5/48.6
=408.8 KJ
Answer: 408.8 KJ

b)
heat flow to the surrounding

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