How much heat is needed to hear 20 grams of lead from 20 degrees Celsius to 150 degrees Celsius?

The specific heat capacity of lead is 0.128 J/g°C. The formula to calculate the heat energy required is Q = mcΔT, where m is the mass of the lead, c is the specific heat capacity, and ΔT is the change in temperature. Plugging in the values, you would get Q = 20g * 0.128 J/g°C * (150°C - 20°C).