How can you ensure the chemical reaction produces the right amount of heat in a hot pack without hurting you?

Calculate the molar mass of aluminum oxide (al2o3). express your answer to four significant figures.

100 grams of molten lead (600°c) is used to make musket balls. if the lead shot is allowed to cool to room temperature (21°c), what is the change in entropy (in j/k) of the lead? (for the specific heat of molten and solid lead use 1.29 j/g⋅°c; the latent heat of fusion and the melting point of lead are 2.45 × 104 j/kg and 327°c, respectively.)

Which three statements represent the benefits of performing experiments using computer simulations?