Question

For the following example, list the given and unknown information (including gratis or moles)
Using the equation 2H20 - 2H2 +02 a chemist must determine how many moles of oxygen can be produced from 345 gratis
of water
a-given
b- unknown
- Find the unknown showing your work
Take the molar mass of O=15.99 and that of H=101

Answer 1

Answer:

9.6 moles O2

Explanation:

I'll assume it is 345 grams, not gratis, of water.  Hydrogen's molar mass is 1.01, not 101.

The molar mass of water is 18.0 grams/mole.

Therefore:  (345g)/(18.0 g/mole) = 19.17 or 19.2 moles water (3 sig figs).

The balanced equation states that:  2H20 ⇒ 2H2 +02

It promises that we'll get 1 mole of oxygen for every 2 moles of H2O, a molar ratio of 1/2.

get (1 mole O2/2 moles H2O)*(19.2 moles H2O) or 9.6 moles O2