17 How many moles of carbon dioxide are produced by the complete combustion of 5

Question

17 How many moles of carbon dioxide are produced by the complete combustion of 5.00 moles of C5Hio? CO2 + H2O a. 0.200 mol b. 5.00 mol c. 2.00 mol d. 10.0 mol e. 25.0 mol 18 How many moles of pentane (CsHio) are reacting when 5.00 moles of carbon dioxide are produced? CO2 + ?? a. 1.00 mol b. 2.00 mol c. 5.00 mol d. 10.0 mol e. 25.0 mol 19.In the combustion of natural gas according to the equation CH4 + O2 , CO2 + H2O how many grams of water are formed during the combustion of 0.264 mole of CH4? a. 0.528 g b. 2.00 g c. 2.38 g d. 4.75 g e. 9.50 g 20. How many grams of aluminum oxide are needed to prepare 11.48 moles of aluminum according to the following reaction: Al203 C - a. 292.9 g b. 430.8 g c. 585.8 g CO e. 1282 g 21 According to the following equation Fe +O Fe20 Calculate the moles of oxygen gas which will react with 89.4 grams a. 1.2 mol b. 1.6 mol c. 2.2 mol d. 2.4 mol e. 3.2 mol of iron.

Explanation / Answer

17.

2 C5H10 + 15 O2 ----------> 10 CO2 + 10 H2O

From the above balanced equation,

2 mol of C5H10 produces 10 mol of CO2

then,

5.00 mol of C5H10 produces 10 * 5 / 2 = 25.0 mol of CO2

(e)

18.

From the above balnced equation,

to produce 10 mol of CO2 , 2 mol of C5H10 reacts

Then,

to produce 5 mol of CO2, 1 mol of C5H10 will react

(a) 1.00 mol

19.

CH4 + 2 O2 ----------> CO2 + 2 H2O

from the above balanced equation,

1 mol of methane forms 36 g. of water

Then, 0.264 mol of methane forms 0.264 * 36 / 1 = 9.50 g. of water

(e)

20.

Al2O3 + 3 C ----------> 2 Al + 3 CO

From the balanced equation,

2 mol of Al is formed form 102 g. of alumina

then,

11.48 mol of Al is formed from 102 * 11.48 / 2 = 585.5 g. of alumina

(c)

21.

4 Fe + 3 O2 ---------> 2 Fe2O3

From the balanced,

4 * 56 g. of iron reacts with 3 mol of O2

then,

89.4 g. of iron reacts with 89.4 * 3 / ( 4 * 56 ) = 1.20 mol of O2

(a)

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