Latent Heat Q: 50g Ice Melting in 1kW Oven

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To estimate the time it takes for 50g of ice to melt in a 1kW microwave, the specific latent heat of ice is applied using the formula ΔQ=mL. The calculation resulted in a time of 0.0165 seconds, which is deemed too small. Participants emphasize the importance of checking units to ensure accuracy in calculations. The discussion highlights the need to reassess the approach to avoid underestimating the melting time. Accurate unit conversion and understanding of latent heat are crucial for solving such problems effectively.
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Homework Statement


50g of ice is placed in a 1kW microwave oven and the oven is turned to full power. Estimate the time it will take for the ice to melt. The specific latent heat capacity of ice in 330kJ −1 kg . Is your answer likely to be an overestimate or an underestimate? Explain your reasoning.

Homework Equations


ΔQ=mL

The Attempt at a Solution


ΔQ=mL
1000xt=0.05x300
.:. t=0.0165 ?

This value seems very small :/
 
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Check your units
 
BvU said:
Check your units
Apologies, I had to do it really quickly. Is the answer correct though ?
 
No
 
BvU said:
No
Where have I gone wrong ?
 
Compare the units on the lefthand side with the units on the righthand side
 
Find it ?
 

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