1. How many grams of O2 are needed to produce 0.400 mole Fe2O3? 2. How many grams H2O are produced when 35.8 g C3H8 react by the following equation?
C3H8 + 5 O2 → 4 H2O + 3 CO2

3. Given the following reaction: Al2(SO4)3 + 6 NaOH → 2 Al(OH)3 + 3 Na2SO4
a. What mass of Al(OH)3 is produced if 22.7 g of NaOH is consumed?

4. Given the balanced equation: 3 CuS + 8 HNO3 → 3 Cu(NO3)2 + 3 S + 2 NO + 4 H2O
a. What number of molecules of NO is produced when 8 grams of S is produced?

the reaction mixture contains some ammonia, plus a lot of unreacted nitrogen and hydrogen. the mixture is cooled and compressed, causing the ammonia gas to condense into a liquid. the liquefied ammonia is separated and removed. the unreacted nitrogen and hydrogen are then recycled back into the reactor .

the atomic number will stay the same no matter how many electrons it has, so it doesn’t decrease nor increase. it’ll only change with a different number of protons

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