Under which conditions is a reaction spontaneous?Edmentum.
1 answer:
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Answer:
Moles of carbon atoms = 3.33 × mol
No. of atoms of C in Diamond = 2.007 × atom
Atoms of graphite = 6.27 × Atoms
Explanation:
given data
Cost of 0.2g of diamond = $5000
Cost of 25 g of graphite = $ 2
solution
we know cost of 0.2g of diamond is $ 5000 so that for 1$
if buy 1$ =
1$ = 4.0 × g Carbon
and Moles of carbon atoms is express as
Moles of carbon atoms = Given mass of Carbon ÷ atomic mass of C .........1
Moles of carbon atoms = 4.0 × g/ 2.0g
Moles of carbon atoms = 3.33 × mol
and
No. of atoms of C in Diamond = No. of moles × Avogadro NO ..............2
No. of atoms of C in Diamond = 3.33 × mol × 6.022 ×
No. of atoms of C in Diamond = 2.007 × atom
Graphite
and wew have given Cost of 25 g of graphite is $2 so for but 1$ we get
for buy $1 = 25÷2 = 12.5 g Of graphite
Moles of graphite = 12.5÷12 = 1.04 mol
Atoms of graphite = 1.04 × 6.022 × 1023
Atoms of graphite = 6.27 × Atoms
Answer:
-5,921x10⁶J/mol
Explanation:
Internal energy change (ΔU) for the reaction of combustion in the bomb calorimeter is:
ΔU = q calorimeter + q solution
Where:
q calorimeter is Ccal×ΔT (Ccal=4042J/°C) and (ΔT is 29,30°C-22,64°C=<em>6,66°C</em>)
q solution is c×m×ΔT (c= 4.184 J/g°C), (m=1502g H₂O), (ΔT is 29,30°C-22,64°C=<em>6,66°C</em>)
Replacing:
ΔU = 26920J + 41854J = <em>68774 J</em>
This energy is per g of n-hexane, now, per mole of n-hexane:
= -<em>5,921x10⁶J/mol</em>
<em>-negative because the energy is produced-</em>
I hope it helps!