Question

Hydrogen burns in oxygen to form water. What mass of oxygen is needed for 1 g of hydrogen, and what mass of water is obtained

Answer 1

Answer:

So first steps first write your reaction:

2H2+O2=2H2O

If we are given 1gram of H2 that concerted to moles is 1/2 or 0.5 moles. From the reaction we see we need 2 moles of H2 tp react woth 1 mol of O2 so the required moles of O2 is 0.25 which you can then multiply by O2’s molar mass of 32g to get 8g.