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An electrical heater is used to supply 85.0 J of energy to a 10.0 g sample...

An electrical heater is used to supply 85.0 J of energy to a 10.0 g sample of aluminum, originally at 295.0 K. Determine the final temperature in degrees Kelvin. (the specific heat capacity for aluminum is 24.35 Jmol-1K-1)

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Answer #1

Molar mass of Al = 26.98 g/mol

mass(Al)= 10.0 g

use:

number of mol of Al,

n = mass of Al/molar mass of Al

=(10 g)/(26.98 g/mol)

= 0.3706 mol

Use:

Q = n*C*(Tf-Ti)

85.0 J = 0.3706 mol * 24.35 J/mol.K * (Tf - 295.0) K

Tf - 295.0 = 9.42

Tf = 304 K

Answer: 304 K

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