How to do and understand this Specific Heat question?

When you cool a piece of glass, it releases 900.0 joules of energy and releases 62.0 degrees Celcius to 30.0 degrees Celcius.

What is the mass of the glass?

1 Answer
Junaid Mirza
May 29, 2018

Mass of glass is #"33.48 g"#

Explanation:

Specific heat is given by

#"S" = "Q"/"mΔT"#

Where

  • #"Q ="# Heat released/added
  • #"m ="# Mass of sample (#"0.84 J/g°C"# for glass)
  • #"ΔT ="# Change in temperature

#"m"= "Q"/"SΔT"#

#color(white)(m) = "– 900.0 J"/"0.84 J/g°C × (30.0°C – 62.0°C)"#

#color(white)(m) = "33.48 g"#

Click here for Specific heats and molar heat capacities for various substances at 20 degree Celsius.

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