How many moles of C2H4 react completely with 1.6 103 moles of O2? Give your answer in standard form to 2 s. f.

C2H4 + 3O2 → 2CO2 + 2H2O
I forgot how to do it:/

Which of these reactions are redox reactions? check all that apply.cd + hcl → cdcl2  + h2cucl2  + na2s → 2nacl + cuscaco3  → cao + co2          2zns + 3o2  → 2zno + 2so2          ch4  + 2o2  → co2  + 2h2o

To calculate percent by mass, use the equation below: calculate the percent by mass of each element. %n = % %h = % %o = %

What three things does a balanced equation show you?