2. Use the information in the table to calculate the enthalpy of this reaction (

Question

2. Use the information in the table to calculate the enthalpy of this reaction (5)* C.Ho(g)+72 Og)2 Co (8)+3H-O0) 2C(s)+3H(g)C2Hs (g) AH--84.7 kJ/mol (a)-764 kJ (b)-1560 kJ (c)-1664 kJ (d)-3120 kJ (e)-4230 kJ 13. What pressure (in atm) will be exerted by a 1.00 g sample of methane, CHs, in a 4.25 L flask at 115 (a) 0.139 (b) 0.330 (c) 0.467 (d) 7.50 (e) 8.90 14. Given the thermochemical equations: Br2(l)+3F2 (g)> 2BrFs (g) AH- -768 kJ Determine AH for the reaction (4)* BrF (g) + F2(g) > BrF, (g) A? (a) -956 kJ (b)-580 kJ (c)-478 kJ (d)-290 kJ (e)-130 kJ 15. Which of the following ions is most likely to form an insoluble sulfate? (a) (a) Ca (b) Cr (c) K (d) Li (e)s 16. Which of the following is not a strong base in aqueous solution? (l) (a) Sr(OH) (b) Ca(OH)2 (c) KOH (d) LiOH (e)NH, 17-The oxidation number of nitrogen given for all the following species is correct except (1) (a) N2H4 (2) (b) N2O (+1 ) (c) NH20H (-1) (d) HNO2 (+3) (e) NH, (-1 )

Explanation / Answer

12. (b) (add up all the equations )

13. (c) (use, PV=nRT, P = nRT/V, n = 0.625 mol)

14. (d) (add up all the equations )

15. (a)

16. (e)

17. (e)

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