January 2019 1 36 Report
Fe + H2SO4 > FeSO4 + H2
T Fe = 35 C
T H2SO4 = 33 C
T FeSO4 + H2 = 38 C
T1= T1ratarata
T1= (35 + 33) / 2 = 68 / 2 =34 C
T2= 38 C
Delta T= 38 - 34 C = 4 C

Perhitungan Delta H
q=m x cp x Delta T

m= Vcampuran x rho larutan
m= 10mL Fe + 20mL H2SO4 x 1g mL-2
m= 30mL x 1gram mL-2
m= 3gram

q= m x Cp x Delta T ( Cp = 4,2 Jg-1K-1)
q= 30 x 4,2 x 4
q= 504 J / 0,504 kJ

Tentukan mmol Fe dan mmol H2SO4
10mL x Fe 1M = 10mL x 1mmol/mL
= 10mmol
= 0,01mol

20mL x H2SO4 1M = 20mL x 1mmol/mL
=20mmol
=0,02mol

Persamaan reaksi Fe + H2SO4 > FeSO4 + H2
1mol Fe = 1mol H2SO4 = 1mol FeSO4 = 1mol H2

nah nanya molnya pake 0,01 apa pake 20/56 ?
dan massanya pakai 30 atau massa per atom ?
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