Question #a106e
1 Answer
Jan 15, 2014
Mole ratios are used as conversion factors between products and reactants in stoichiometry calculations.
For example, in the reaction
2H₂(g) + O₂(g) → 2H₂O(g)
The mole ratio between O₂ and H₂O is
The mole ratio between H₂ and H₂O is
Example:
How many moles of O₂ are required to form 5.00 moles of H₂O?
Solution:
5.00 mol H₂O ×
If the question had been stated in terms of grams, you would have had to convert grams of H₂O to moles of H₂O, then moles of H₂O to moles of O₂ (as above), and finally moles of O₂ to grams of O₂.