number 29 37,38,39,40 5.00 mol of acetylene react completely with sufficient oxy

Question

number 29

37,38,39,40

5.00 mol of acetylene react completely with sufficient oxygen, how many mol of carbon dioxide are produced? 2 C2H2(g) + 52 (g) 4 CO2(g) + 2 H2O(g) Answer: 2 noles 29. Acetylene gas, C2H2, reacts with oxygen according to the following equation. If 52.0 g of acetylene react completely with sufficient oxygen, how many grams of carbon dioxide are produced? 2 C2H2(g) + 52(g) 4 CO2(g) + 2 H2O(g) Answer 30. How many grams of barium sulfate can be made from 2.00 grams of barium chloride? BaCl2 (aq) + Na2SO4 (aq) BaSO4 (s ) + 2NaCl(aq

Explanation / Answer

29) write balance reaction equation

2 C2H2(g) + 5O2(g) --------> 4CO2 (g) + 2H2O (g)

now, from balance reaction we know that 2 mole of C2H2 react to suficient O2 produce 4 mole of CO2

moles of C2H2 = mass / molar mass = (52.0 g / 24.04 g/mol) = 2.163 mol

so CO2 will be = (2x 2.163 mol) = 4.326 moles

mass of CO2 = molar mass x moles = (44.01 g/mol x 4.326 moles ) = 190.39 g

37) write balance reaction first

2Fe2O3 (s) + 3C(s) -----> 3CO2 (g) + 4Fe (s)  

now from balance reaction it is clear 2 mole of Fe2O3 react with 3 mole of C and produce 3 mole of CO2 and 4 mole of Fe

38) write raction

Zn + CuCl2 ----> ZnCl2 + Cu

now this reaction is balanced so,

1 mole of Zn react with 1 mole of CuCl2 and produce 1 mole of ZnCl2 and 1 mole of Cu
moles of zinc = mass / molar mass = (3.25 g / 65.38 g/mol ) = 0.0497 moles

moles of Cu theoritical produce = 0.0497 moles

mass of Cu = molar mass x moles = (0.0470 moles x 63.546 g/mol) = 3.158 g

percent yield = (3.0 g / 3.158 g ) x 100 = 94.97 %

39) write reaction

CH4(g) + 2O2(g) -----> CO2(g) + 2H2O(g) + 802 KJ

in this question heat of evolution given for 1 mole of CH4

moles of CH4 = (10.0 g / 16.04 g/mol) = 0.62344 moles

heat produce from 1 mole CH4 = 802 KJ

now for 0.62344 mole CH4 = (802 KJ x 0.62344 moles ) = 500 KJ

now convert 500 KJ to Kcal so

(1 KJ = 0.239006 Kcal )

500 KJ = 119.503 Kcal

40) exothermic reaction

exothermic reaction is a chemical reaction that releases energy by light or heat.

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