Using the equation 2h2+o2--> 2h2o if 19g of oxygen reacts completely, how many grams of hydrogen must react with it

2.4 grams

Explanation:

To calculate the moles, we use the equation:

For

Given mass = 19 g

Molar mass of   = 32 g/mol

Putting values in above equation, we get:

1 mole of reacts with 2 moles of

0.60 moles of wil react with = moles of

mass of

Thus 2.4 grams of hydrogen will react completely with 19 g of oxygen.

i would say b

explanation:

but i think i would need more information than that