How many moles of lead are equivalent to 9.51 × 10 3 g of Pb?

What does the symbol (–hfus) indicate in a phase change?

Some liquids can be distilled, but only at temperatures that are so high that it is impractical, or so high the compound decomposes. explain why distillation such compounds at significantly less than atmospheric pressure (some degree of vacuum) would solve this problem.

What is the name of the enzyme that forms at the start of transcription?