Question

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?

Answer 1

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.