Question

A. Use the balanced equation C3H8 + 5O2 -> 3CO2 + 4H2O to answer the following questions

i. How many moles of CO2 are produced from 5 moles 02? (1 point)

ii. How many grams of CO2 are produced from 5 moles O2? (2 points)
iii how many grams of CO2 are produced from 128.00g O2? (2 points)

Answer 1

i. 3 moles.

ii. 132.03 grams.

iii. 105.6 grams.

Step-by-step explanation:

Hello!

In this case, given the balanced chemical reaction, we can proceed as follows:

i. By starting with 5 moles of oxygen, via the 5:3 mole ratio we compute the produced moles of CO2:

`n_(CO_2)=5molO_2*(3molCO_2)/(5molO_2) =3molCO_2`

ii. Now, since we have previously computed the moles of CO2 from the same moles of oxygen, by using its molar mass (44.02 g/mol), we obtain:

`m_(CO_2)=3molCO_2*(44.01gCO_2)/(1molCO_2) =132.03gCO_2`

iii. Now, we need to combine the previously used two proportional factors for the calculation of the mass of CO2 from 128.00 grams of oxygen (molar mass 32.00 g/mol):

`m_(CO_2)=128.00gO_2*(1molO_2)/(32.00gCO_2)*(3molCO_2)/(5molO_2)*(44.01gCO_2)/(1molCO_2)\\\\m_(CO_2)=105.6gCO_2`

Best regards!