Question

Use the balanced equation to solve the problem.C3H8 +502 3CO2 + 4H₂O-4.16L O₂ gas react with C3H8 at STP.How many grams of H₂O are made?g

Answer 1

Step 1

It is known that at STP:

1 mole of any gas = 22.4 L

--------------------

Step 2

Information provided:

4.16 L of O2

------

Information needed:

The molar mass of H2O = 18.0 g (please, the periodic table is useful here)

-------------------

Step 3

By stoichiometry,

C3H8 + 5 O2 => 3 CO2 + 4 H2O (the reaction is completed and balanced)

5 x 22.4 L O2 ------------ 4 x 18.0 g H2O

4.16 L O2 ------------ X

X = 4.16 L O2 x 4 x 18.0 g H2O/5 x 22.4 L O2

X = 2.67 g H2O

Answer: 2.67 g H2O