(06pts) 4. Find the AHnn for. C(s) + Olg) CO2(g) using the following: SrO(s) + C
ID: 592098 • Letter: #
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(06pts) 4. Find the AHnn for. C(s) + Olg) CO2(g) using the following: SrO(s) + CO2(g) Scots) &H;=-234 kJ +1184 kJ 2scots) 2Sr(s) + 2C(s) + 302(g) »-+2440 kJ Show all work! (07pts) 5. A 156gchunk of iron is heated to 75.0 C and transferred to 100.0 g of a liquid the initially at 35 0 °C. If the final temperature of the mixture is 49.5°C, what is specific heat of the liquid? The specific heat of iron is 0.450 JI/g'C (06pts) 6. An aqueous solution of H2SO, has a molality of 8.010 m and a density of 1.354 g/ml, what is the molarity of the solution and the % (by mass) of H2SO, in solution? (The MM of H SOs is 98.08 g/mol)Explanation / Answer
4)
Lets number the reaction as 0, 1, 2, 3 from top to bottom
required reaction should be written in terms of other reaction
This is Hess Law
required reaction can be written as:
reaction 0 = -1 * (reaction 1) +0.5 * (reaction 2) -0.5 * (reaction 3)
So, deltaHo rxn for required reaction will be:
deltaHo rxn = -1 * deltaHo rxn(reaction 1) +0.5 * deltaHo rxn(reaction 2) -0.5 * deltaHo rxn(reaction 3)
= -1 * (-234.0) +0.5 * (1184.0) -0.5 * (2440.0)
= -394.0 KJ
Answer: -394.0 KJ
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