How many kJ of heat is necessary to raise the temperature of 60.0 g of aluminium from 35°C to 55°C ? Molar heat capacity of Al is 24 J mol-1 K-1

Question

How many kJ of heat is necessary to raise the temperature of 60.0 g of aluminium from 35°C to 55°C ? Molar heat capacity of Al is 24 J mol-1 K-1 (A) 4.07 KJ (B) 1.07 KJ (C) 3 K (D) 7 KJ

Tardigrade Admin · Accepted Answer

Mass of Al = 60 g Rise in temperature Δ T=55°-35°=20°C Molar heat capacity of Al=24 J mol- K-1 Specific heat capacity of Al =(24/27)J g-1 K-1 ∴ Energy required =m × c × Δ T 60 × (24/27) × 20 = (28800/27)=1066.67 J =1.067 kJ or 1.07 kJ

Q. How many $k J$ of heat is necessary to raise the temperature of $60.0 g$ of aluminium from $3 5^{\circ} C$ to $5 5^{\circ} C$ ?
Molar heat capacity of $A l$ is $24 J m o l^{- 1} K^{- 1}$

$4.07 K J$

$1.07 K J$

$3 K$

$7 K J$

Q. How many kJ of heat is necessary to raise the temperature of 60.0g of aluminium from 35∘C to 55∘C ? Molar heat capacity of Al is 24Jmol−1K−1

4.07KJ

1.07KJ

3K

7KJ

Mass of Al=60g Rise in temperature ΔT=55∘−35∘=20∘C Molar heat capacity of Al=24Jmol−K−1 Specific heat capacity of Al=2724​Jg−1K−1 ∴ Energy required =m×c×ΔT 60×2724​×20=2728800​=1066.67J =1.067kJ or 1.07kJ

Q. How many $k J$ of heat is necessary to raise the temperature of $60.0 g$ of aluminium from $3 5^{\circ} C$ to $5 5^{\circ} C$ ?
Molar heat capacity of $A l$ is $24 J m o l^{- 1} K^{- 1}$

$4.07 K J$

$1.07 K J$

$3 K$

$7 K J$