MgO (s) + HCl (aq) MgCl2 (aq) + H2O (l)
Calculate how much MgCl2 you obtain from 200 g of MgO (s) and an excess of HCl (aq)

How many grams of co(g) are there in 74.5 ml of the gas at 0.933 atm and 30o c?

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 is true according to the law of conservation of energy