Write a balanced chemical equation for the synthesis of liquid water from its elements?

Question

i'm not sure if the correct answer would be 2H2 + O2 ---> 2H20

or 2H + .5O2 ----> H2O

Answer 1

You are using complete molecules of hydrogen and oxygen, and that should tell you the answer.

Answer 2

Yep, the first one is right!

To balance it, you need twice as much hydrogen as oxygen, because the formula is H2O.

2H = 2 hydrogens
5O2 = 10 oxygens

2H2 = 4 hydrogens
O2 = 2 oxygens

See which one works??

Answer 3

first one