Grade 9 Physics (Heat fusion, Heat Capacity)

  • #1

Homework Statement:

The melting point of a solid is 90 C. What is the heat required to change 2.5 kg of this solid at 30 C to a liquid

The specific heat of the solid is (390 j/KG.C) and its heat fusion is (4000 J/KG)

Relevant Equations:

Q=mC ΔT heat capacity
Q=mHf heat of fusion
Q1=2.5(390)(90-30) =58500

Q2=2.5(4000) = 10000

Qtotal = 58500+10000

Q=68500

=6.8x10^4

my teacher sent this as a homework but the options were
4.9x10^4 J
1x10^4 J
6.8x10^5 J
5.9x10^4 J

im confused is is this a typo or did i do something wrong
 

Answers and Replies

  • #2
etotheipi
2020 Award
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I agree with your answer, perhaps they just put a "^5" instead of a "^4"?
 

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