The amount of heat required to heat 1.5 litres of water from 30C to 75C is?

1 Answer
Junaid Mirza
May 11, 2018

#282.555\ "kJ"#

Explanation:

Mass of #"1.5 L"# water is

#"Mass = Volume × Density" = 1.5 cancel"L" × 1000\ "g"/cancel"L" = 1500\ "g"#

Now, use this equation

#"Q = mSΔT"#

Where

  • #"m ="# Mass of sample
  • #"S ="# Specific heat capacity of sample (#"4.186 J/g°C"# for water)
  • #"ΔT ="# Change in temperature of sample

#"Q" = 1500 cancel"g" × 4.186\ "J"/(cancel"g" cancel"°C") × (75 - 30)\ cancel"°C" = 282555\ "J" = 282.555\ "kJ"#

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