Question

HELP FAST 100 PTS Calculate the amount of heat needed to lower the temperature of 50.0g of ice from -40 °C to -100 °C.

Answer 1

It would be -20 I think not sure

Answer 2

Answer:

$\Large \boxed{\sf -6000 \ J}$

Explanation:

Use formula

$\displaystyle \sf Heat \ (J)=mass \ (kg) \times specific \ heat \ capacity \ (Jkg^{-1}\°C^{-1}) \times change \ in \ temperature \ (\°C)$

Specific heat capacity of ice is 2,000 J/(kg °C)

Substitute the values in formula and evaluate

$\displaystyle \sf Heat \ (J)=0.05 \ kg \times 2000 \ Jkg^{-1}\°C^{-1} \times (-100\°C-(-40 \°C))$

$Q=0.05 \times 2000 \times (-100-(-40)) =-6000$