Answers to 6,7,8,9,10 please!! What a the specific heat of an unknown substance

Question

Answers to 6,7,8,9,10 please!! What a the specific heat of an unknown substance if 25 0 grams of the substance absorbs 77 0 calories of heal and the temperature increases by 5.5 degree C? How much heat must be added to a 2 22 g p piece of gold (specific heat = 0 129 J/g K) to raise its temperature from 25 00 degree C to 34 00 degree C? Given the thermochemical equations and their corresponding enthalpies: What is the Delta H foe the following reaction? Given the following two equations and their respects e enthalpies: What is the enthalpy change, Delta H_max for the following reaction? 2SO_3(g) rightarrow 2SO_2 (g) + O_2(g)

Explanation / Answer

6. q = m*s*DT

77 cal = 25*s*5.5

S = specificheat of substance = 0.56cal/g.c

answer: c

7. q absorbed = m*s*dt

                = 2.22*0.129*(34-25)

           = 2.58 j

answer : c

8. DHrxn = 2*-890 + 1410 = -370 kj

answer : d

9. DHrxn = 2*395.6 + (2*-296.8) = 197.6 kj

DHrxn = 197.6/2 = 98.8 kj/mol

answer: c

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