How many moles of Ca(OH)2 are present in 370.47 grams of Ca(OH)2?

In salt water solution,the salt is the blank

What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?

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.)