Answer:
T = 52.3°C
Explanation:
given,
total mass = 407 g
power = 750 W
time = 5 minutes
Latent of melting = 334 J/g
increase in temperature = ?
energy required to melt =
= m Lm
= 334 x 407
= 135938 J
energy by the microwave
E = 750 x 5 x 50
E = 225000 J
Actual energy increased
= 225000-135938 = 89062 J
using formula
Q = m c_s Δ T
c_s is the specific heat of water which is equal to 4.184 J/g⁰C
[tex]T = \dfrac{89062}{407 \times 4.184}[/tex]
T = 52.3°C
