Question

Using the equation below, how many liters of water can be made from 7.6 L of oxygen gas at STP?

Answer 1

V = 15.2 L

Step-by-step explanation:

STP means that T = 273 K and P = 1 atm.

We use the PV=nRT equation to convert the given liters of oxygen to moles:

• 1 atm * 7.6 L = n * 0.082 atm·L·mol⁻¹·K⁻¹ * 273 K

• n = 0.340 mol

Now we convert O₂ moles to H₂O moles, using the stoichiometric coefficients of the equation:

• 0.340 mol O₂ *
  `(2molH_2O)/(1molO_2)` = 0.68 mol H₂O

Finally we use the PV=nRT equation once again to convert 0.68 moles of H₂O to liters:

• 1 atm * V = 0.68 * 0.082 atm·L·mol⁻¹·K⁻¹ * 273 K

• V = 15.2 L