Question

its time for the unit exam. this is your opportunity to show how much you hav if you dont feel ready, you may want to stop and clarify anything you do not un over any notes you have taken and review the key terms. good luck! note: to answer some of the questions, it may help to reference a periodic table examine the reaction. h₂(g) + o₂(g) → h₂o(l) what coefficients will balance the equation? 1, 1, 2 1, 2, 1 2, 2, 2 2, 1, 2

Explanation:

Step1: Count atoms on both sides

Original equation: \(H_2(g)+O_2(g)\to H_2O(l)\)
Left side: \(H = 2\), \(O=2\)
Right side: \(H = 2\), \(O = 1\)

Step2: Balance oxygen first

Multiply \(H_2O\) by \(2\): \(H_2(g)+O_2(g)\to 2H_2O(l)\)
Now right side: \(H = 4\), \(O = 2\)

Step3: Balance hydrogen

Multiply \(H_2\) by \(2\): \(2H_2(g)+O_2(g)\to 2H_2O(l)\)
Left side: \(H = 4\), \(O = 2\)
Right side: \(H = 4\), \(O = 2\)

Answer:

\(2,1,2\)