I need help with 5 chemistry questions about reactions

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checyrtvey

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3.(15pts) In each case, find the missing AH. (kJ/mole) (a)(10pts) If 4 B(s) + 3 O2(g) > 2 B203(s) then (i) 1/2 B2O3(s) ------> B(s) + 3/4 O2(g) ---- AH = -2509.1 kJ/mol ΔΗ° = ? (ii) 16 B(s) + 12 02(g) ----> 8 B203 (s) ΔΗ, = ? (b) (5pts) If P(s) + 3 O2(g) and P4(s) + 5 O2(g) > P406 (s) > P4010(s) AH = -1640.1 kJ/mol AH = - 2940.1 kJ/mol then P406(s) + 2 O2(g) > P4010(s) AH = ? 4. (14 pts) Calculate AHxn° for the reaction N2H4(1) + O2(g) N2(g) + 2H2O(1) given the following data: 2NH3(g) + 3N2O(g) 4N2(g) + 3H2O(1) N2O(g) + 3H2(g) = N2H4(1) + H2O(1) 2NH3(g) + (1/2) O2(g) N2H4(1) + H2O(1) H2(g) + (1/2) O2(g) H2O(1) AHxnº= -1010 kJ/mole AH = -317 kJ/mole AHA = -143 kJ/mole AHAD = -286 kJ/mole = 5. (15 pts) Consider the following reaction P4(s) + 6 Cl2(g) ----> 4 PC13(s) AH (kJ/mole)=-1280 kJ/mole If 18.00 grams of P4 react with 42.60 g of Cl2(g) how much heat will be liberated? All calculations must be shown. A guess is not sufficient. Hint: What is the limiting reagent? (Gen. Chem I. Homework #6 (continued) 6.(15 pts) The space shuttle orbiter utilized the oxidation of methyl hydrazine by dinitrogentetroxide for propulsion. The balanced reaction is 5N2O4(1) + 4N H3CH3(1) 12H2O(g) + 9N2(g) + 4CO2(g) Calculate AH for the reaction. In addition to tables in your book you will need the following data: N2H3CH3 (1) AH = 54.0 kJ/mole N204(1) AH = -20.0 kJ/mole 7.(10 pts) Consider two Styrofoam coffee cups. If cup #1 contains 128.0 mL of water at 88.0 °C and cup #2 contains 59.6 mL of water at 18.5 °C, what is the final temperature, in °C, when the contents of cup #1 are poured into cup #2? Ignore the heat capacity of the cup. Assume that the density of water is 1.00 g/mL.
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I was having a hard time with this subject, and this was a great help.

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