Question

Calcula la masa de O2 consumida y la masa de agua formada al reaccionar 28 gramos de H2.

H2 + O2--> H2O

Answer 1

                      2 H2 + O2 → 2 H2O

Mm H2 = 2 g/mol
       O2 = 32 g/mol

g O2 = 28 g H2  x  1 mol H2  x  1 mol O2  x  32 g O2
                              `````````````    ``````````````   `````````````
                                 2 g H2       2 mol H2     1 mol O2

g O2 = 224