The rock in a lead ore deposit contains 89% pbs by mass. how many kilograms of the rock must be processed to obtain 5.0 kg of pb?

How many atoms are in 1.4 mil of phosphorus trifluoride (pf3)

Consider the point on the plot where 10.0 g of naoh have been added. what amount of naoh, in moles, has been added? 0.308 mol fecl3 initially present

Which is a chemical property of iron? a. it forms iron oxide (rust) when exposed to moisture and air. b. it is a gray–black metal that is hard to the touch. c. it has a melting point of 2795°f (1536°c). d. it is a good conductor of heat