how much hydrogen (h2) must react with o2 in order to release 587.9kj of energy?
the reaction is - h2(g) + 1/2o2(g)-> h2o(l); delta H = -285.8 kj
a)4.147 g
b)2.073 g
c).2412 g
d)6.162 g
e)2.131g
the reaction is as follows
H2 + 1/2 O2 ----------------------->
H2O H = -285.8
Kj
from the equation 1 mol H2 produces the 285.8 KJ i.e as follows
1 mol H2 ----------------------------> 285.8 Kj
? --------------------------------> 587.9 Kj
=> 587.9 * 1 / 285.8
=> 2.0570 moles
mass of H2 => moles * molar mass
mass = 2.0570 moles * 2.01588 g/mol
mass = 4.14673 grams
answer => a) 4.147 g
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