A1.00 g sample of n-hexane (c6h14) undergoes complete combustion with excess o2 in a bomb calorimeter. the temperature of the 1502 g of water surrounding the bomb rises from 22.64°c to 29.30°c. the heat capacity of the hardware component of the calorimeter (everything that is not water) is 4042 j/°c. what is δu for the combustion of n-c6h14? one mole of n-c6h14 is 86.1 g. the specific heat of water is 4.184 j/g·°c.

-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=6,66°C)

q solution is c×m×ΔT (c= 4.184 J/g°C), (m=1502g H₂O), (ΔT is 29,30°C-22,64°C=6,66°C)

Replacing:

ΔU = 26920J + 41854J = 68774 J

This energy is per g of n-hexane, now, per mole of n-hexane:

= -5,921x10⁶J/mol

-negative because the energy is produced-

I hope it helps!

a  solution  is always transparent, light passes through with no scattering from solute particles which are molecule in size. the  solution  is homogeneous and does not settle out. a colloid is intermediate between asolution  and a  suspension. while asuspension  will separate out a colloid will not.