Question

10. How many grams of H2O(8) are produc S of H2O(g) are produced at the same time that 45 kJ of energy are produced? Is this an endothermic or an exothermic reaction? Explain. equation is: mie reaction? Explain. The thermochemical 2C4H10(g) + 1302(g) + SCO(g) + TOHO(g) +5.77 x 103 kJ 11. In the following reaction, which species are reduced and what is the reducing agent? 2C4H10(g) + 1302(g) - 8C02(g) + 10H2O(g) +5.77 x 103 kJ 12. In the following reaction, which species are oxidized and what is the oxidizing agent? Sn(aq) + 2Fe+(aq) - Sn(s) + 2Fe (aq) 13. Write the balanced molecular, full ionic and net ionic equations and give the name(s) and formula(s) of the spectator ion(s) in the reaction between an aqueous solution of Ca(NO3)2(aq) and an aqueous solution of K:Say that results in the formation of an insoluble sulfide compound.

Answer 1

10)

when -5770.0 KJ of heat is involved, 10 mol of H2O is reacting

So,

for -45 KJ, mol of H2O = -45*10/-5770.0 KJ

= 7.799*10^-2 mol

Molar mass of H2O,

MM = 2*MM(H) + 1*MM(O)

= 2*1.008 + 1*16.0

= 18.016 g/mol

use:

mass of H2O,

m = number of mol * molar mass

= 7.799*10^-2 mol * 18.02 g/mol

= 1.405 g

Answer: 1.405 g

Since heat is released, the reaction is exothermic.

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