64.9 grams of potassium chloride are reacted with excess oxygen to produce potassium chlorate. If 77.1 grams of potassium chlorate are produced, what is the percent yield of this reaction? 2KCl + 3O2 --> 2KClO3

Idon’t know how to solve this question

What is the empirical formula of c6h18o3? ch3o c2h5o c2h6o c2h5o5

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.)