Answer:
148.7grams
Explanation:
We need to balance the equation first
2H2 + O2 --> 2H2O
now we set up a mole ratio where we know the mole ratio of hydrogen is 2 and the mole ratio of water is 2 as well. SInce the moles are the same, nH2O = nH2
now we can calculate mass
(m is mass of water, n is moles of water, M is molecular mass of water)
molecular mass of H2O can be found by adding atmoic mass of 2 hydrogen and one oxygen (1.01+1.01+16.00)
n = m/M rearrange to m = n*M
m = 8.25mol*18.02mol
m = 148.665g
