Raising Air Temp in Living Room: Calculations Needed

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To raise the temperature of a living room measuring 3m x 5m x 8m by 10 degrees Celsius, the heat gained can be calculated using the formula: mass x specific heat x change in temperature. The mass of the air in the room is determined by multiplying the room's volume by the density of air, which is 1.20 kg/m^3. The specific heat of air is 1006 J/kg. The total energy required can then be calculated by multiplying the mass of the air by the specific heat and the temperature change. This calculation will provide the necessary energy to achieve the desired temperature increase.
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A 1500-W heater is designed to be plugged into a 120-V outlet.

How long does it take to raise the temperature of the air in a good-sized living room (3m x 5m x 8m) by 10.0 degrees C. Note that the specific heat of air is 1006 J/kg and the density of air is 1.20 kg/m^3.

I=12.5 A
R=9.6 ohms

I found I and R but don't know the equation to solve this last part
 
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What is the formula for calculating the heat gained by the air?
 
(mass) x (specific heat) x (chang in temp)?
 
How much energy does it take to raise the room temperature? You need to answer that question.
 
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