Assume that coal can be represented by the chemical formula C135H96O9NS. Show yo
ID: 993623 • Letter: A
Question
Assume that coal can be represented by the chemical formula C135H96O9NS. Show your work.
a. What is the percent of nitrogen by mass in coal? (You need to determine the mass of coal and divide the atomic mass of nitrogen by this.)
b. If 3 tons of coal is burned, what minimum mass of nitrogen in the form of NO is produced? Assume that all of the nitrogen in the coal is converted to NO.
c. Actually more NO is produced than you just calculated. (What reaction happens to the two major components of air at high temperatures? Write the reaction.)
Explanation / Answer
a) Molecular mas of coal= (135 x 12) + (96 x 1) + ( 16 x 9) + 14 + 32= 1906g/mole
1 mole of coal contains 14g of nitrogen
So mass percent of nitrogen by mass in coal=(14/1906) x 100 = 0.73%
b) 3 tons= 1574moles of coal
1 mole of coal= 30g of NO
1574 moles of coal = 1574 x 30 = 47220g of NO
c) ) The excess of NO could be generated by the reaction with burning coal of nitrogen compounds present into atmosphere