b. How much energy is required to heat 550 g of iron (c_(iron)=0.449J/g^circ C) initially at 20^circ C to 100^circ C

To calculate the energy required to heat a substance, we can use the formula for heat energy: where:- is the heat energy (in joules),- is the mass of the substance (in grams),- is the specific heat capacity of the substance (in joules per gram per degree Celsius),- is the change in temperature (in degrees Celsius).Given:- Mass of iron, - Specific heat capacity of iron, - Initial temperature, - Final temperature, First, calculate the change in temperature ( ): Now, substitute the values into the formula: Therefore, the energy required to heat 550 g of iron from to is 19,736 joules.