4 HF + O2 --> 2 F2 + 2 H2O If 2.390 x 1026 molecules of HF react how many grams of Fluorine is produced? If the same 2.390 x 1026 molecules of HF react how many liters of H2O are produced?

Answer 1

4HF + O₂ ==> 2F₂ + 2H₂O

2.390x10²⁶ HF molecules x 1 mol HF/6.022x10²³ molecules = 3.969x10² moles HF

mass F₂ produced = 3.969x10² moles HF x 2 mol F₂/4 mol HF x 38.00 g HF/mol = 7541g F₂

3.969x10² moles HF x 2 mol H₂O/4 mol HF = 1.985x10² moles H₂O formed

The volume of H2O gas will depend on the temperature and pressure. If we assume it is at STP (standard temperature and pressure; 273K and 1 atm), then each mole of H2O(g) = 22.4 L. Thus...

1.985x10² moles x 22.4 L/mol = 4446 L

If the H₂O is liquid, and you assume a density of 1g/ml, then the volume of water is as follows:

1.985x10² mol H₂O x 18 g/mol x 1 ml/g x 1 L/1000 ml = 3.573 L