Sidney P. answered • 05/22/21
Tutor
4.9
(1,532)
Astronomy, Physics, Chemistry, and Math Tutor
The reaction needs no balancing: C2H4 + H2 --> C2H6. Then it's dimensional analysis:
(5.11g H2) * (1 mole H2 /2.016g H2) * (1 mole C2H6 /1 mole H2) = 2.535 mol C2H6.
(10.9g C2H4) * (1 mole C2H4 /28.05g C2H4) * (1 mole C2H6 /1 mole C2H4) = 0.3885 mole C2H6.
Maximum mass of ethane comes from smaller result, (0.3885 mole C2H6) (30.07 g C2H6 /1 mole C2H6) = 11.7 g ethane. Formula of limiting reagent is C2H4.
Excess reagent mass: (Δmoles = 2.146 mole C2H6) * (1 mole H2 /1 mole C2H6) * (2.016g H2 /1 mole H2) = 4.33g hydrogen gas.
