how many moles of O2 will react with 0.950moles of C3H6? 2C3H6+9O2=>6CO2+6H2O

Question

this is stoichiometry and chemistry and is difficult. please show me how to find the answer

Answer 1

since you already have the balanced equation you can use the coefficients to form the mole ratio. in this one that should be 9/2, because for every 2 moles of C3H6 there are 9 moles of O2.

meaning that the end value here is

0.950 mol C3H6 x 9 mol O2 / 2 mol C3H6 = 4.275 mol O2

Answer 2

You always start with a balanced equation: 2C₃H₆ + 9O₂→ 6CO₂ + 6H₂O

 

The key is making a fraction using the numbers in front of the compounds (coefficients). Your unknown compound is indicated by the phrase "how many", in this case moles of O₂. Your known is indicated by numbers, in this case 0.950 moles of C₃H₆. Make a fraction with the coefficient of the unknown over the coefficient of the known: 9/2

 

Put the known amount over 1 to make the fraction 0.950/1. Now put the two fractions side by side and multiply the two numerators together and multiply the 2 denominators together: 8.55/2  Last divide the top by the bottom: 8.55 ÷ 2= 4.28. So your answer is 4.28 moles of O₂.

 

I hope this helps.