Molar Ratio Problem

Question

2c2h6+7o2 = 4co2+6h2o

What is the molar ratio would you use if you have 2.9 mol O2 and you wanted to know how many moles of CO2 it would make?

Is it:

A = (2 mol C2H6) / (7 mol O2)

B = (7 mol O2 )/ (4 mol CO2)

C = (4 mol CO2) / (7 mol O2)

D = (1 mol CO2) / (2.9 mol O2)

Answer 1

We can find the molar ratio from our balanced chemical equation:

2 C₂H₆ + 7 O₂ ––> 4 CO₂ + 6 H₂O

From our coefficients, we know that for every 7 mol of O₂ that reacts, 4 mol of CO₂ are created. Thus, our molar ratio is:

7 mol O₂ / 4 mol CO₂

So your answer is B