How many grams of oxygen does it take to burn 11.4 g of glucose?
What is the theoretical yield in grams of carbon dioxide if 10.9 g of glucose is burned?
1)
Molar mass of C6H12O6 = 6*MM(C) + 12*MM(H) + 6*MM(O)
= 6*12.01 + 12*1.008 + 6*16.0
= 180.156 g/mol
mass of C6H12O6 = 11.4 g
mol of C6H12O6 = (mass)/(molar mass)
= 11.4/180.156
= 0.0633 mol
we have the Balanced chemical equation as:
C6H12O6(s) + 6O2(g) -->6CO2(g) + 6H2O(g)
From balanced chemical reaction, we see that
when 1 mol of C6H12O6 reacts, 6 mol of O2 is reacting
mol of O2 reacts = (6/1)* moles of C6H12O6
= (6/1)*0.0633
= 0.3797 mol
Molar mass of O2 = 32 g/mol
mass of O2 = number of mol * molar mass
= 0.3797*32
= 12.1 g
Answer: 12.1 g
2)
Molar mass of C6H12O6 = 6*MM(C) + 12*MM(H) + 6*MM(O)
= 6*12.01 + 12*1.008 + 6*16.0
= 180.156 g/mol
mass of C6H12O6 = 10.9 g
mol of C6H12O6 = (mass)/(molar mass)
= 10.9/180.156
= 0.0605 mol
From balanced chemical reaction, we see that
when 1 mol of C6H12O6 reacts, 6 mol of CO2 is formed
mol of CO2 formed = (6/1)* moles of C6H12O6
= (6/1)*0.0605
= 0.363 mol
Molar mass of CO2 = 1*MM(C) + 2*MM(O)
= 1*12.01 + 2*16.0
= 44.01 g/mol
mass of CO2 = number of mol * molar mass
= 0.363*44.01
= 16.0 g
Answer: 16.0 g
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