Question

If you are given 70.0 g of C2H6, how many grams of CO2 is made? (3 step problem) *
3 points
A.30
B.44
C. 205

Answer 1

Answer:

C) 205

Explanation:

Molar mass of C2H6 = (2×12 + 6×1) g = 24+ 6 g = 30 g

Moles of Ethane(C2H6) = Total weight/Molar mass

= 70 g/30 g = 7/3 moles

Balanced Reaction of C2H6 will be:

2C2H6 + 7O2 —> 4CO2 + 6H2O

Applying unitary method,

2 moles of C2H6 can make 2 moles of CO2,

1 mole can make 2 moles of CO2

7/3 moles can make 2×7/3 = 14/3 = 4.67 moles of CO2

Mass of CO2 = 4.67 × (12 + 2×16) = 44 × 4.67 = 205.48

~ 205