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How many moles of Pb are there in a sample of Pb that contains 2.29x1024 atoms?
moles

Ineed this asap part i: scientific method what is the difference between science and pseudoscience? what is the scientific method?

Which statement describes the phase change that occurs when dry ice is placed in an open container at room temperature?

Calcium carbonate decomposes at high temperatures to give calcium oxide and carbon dioxide as shown below. caco3(s) cao(s) + co2(g) the kp for this reaction is 1.16 at 800°c. a 5.00 l vessel containing 10.0 g of caco3(s) was evacuated to remove the air, sealed, and then heated to 800°c. ignoring the volume occupied by the solid, what will be the mass of the solid in the vessel once equilibrium is reached?