How many Joules does it take to heat up 15.1 kg of glass from 15°C to 45°C

380,520 Joules

Explanation: Quantity of heat, Q is calculated by multiplying the mass, m of a substance by specific heat capacity, c of the substances and the change in temperature, Δt.

That is;

Q = m*c*Δt

In the question above;

Mass of glass is 15.1 kg

Change in temperature = 45°C - 15 °C

= 30°C

Specific heat capacity of glass = 840 J/kg/°C

Therefore;

Quantity of heat, Q = 15.1 kg * 840 J/kg/°C * 30°C

= 380,520 Joules

Hence, it takes 380,520 Joules to heat up 15.1 kg of glass from 15°C to 45°C.