What type of substances is filtration useful for seperating? give me an example.

What does the mass of 0.7891 mol of ferric oxide (fe2o3)

How many moles is 14.5 cm^3 of platinum? the density of platinum is 21.45 g/cm^3.

Large helium-filled balloons are used to lift scientific equipment to high altitudes. what is the pressure inside such a balloon if it starts out at sea level with a temperature of 10.0ºc and rises to an altitude where its volume is twenty times the original volume and its temperature is – 50.0ºc ?