The relative molar mass of a dehydrate YSO4.2H2O is 172. What is the relative atomic mass of Y.

Calculate the number of molecules present in 0.750 mol of mgo.

An observation that requires measurement is called quantitative observable or qualitative

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.)