If six moles of oxygen gas react in excess hydrogen gas, how many grams of h2o will the reaction produce? (remember to balance the equation first.)

216 g H2O

Explanation:

O2   +  2H2 ---> 2H2O

1 mol                   2 mol

6 mol                   x mol

x mol H2O = 6 mol O2 * 2 mol H2O/1 mol O2 = 12 mol H2O

M(H2O) = 2*1.0 + 16.0 = 18.0 g/mol

12 mol H2O *(18.0 g/1 mol) = 216 g H2O

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer