Asample of calcium oxide has mass of 2.80 g. the molar mass of cao is 58.08 g/mold how many moles of cao does this sample contain

What mass of carbon dioxide is produced from the complete combustion of 4.50×10−3 g of methane?

What amount of heat is exchanged when 106.2 grams of substance y goes from a liquid at 35 degrees celsius to a solid at the same temperature? melting point of substance y = 35 degrees c; δhvaporization = 3.67 j/mol; δhfusion = 3.30 j/mol. mwsubstance y = 28.22 g/mol. −12.4 j −3.51 x 102 j 1.24 x 101 j 351 j

What is a difference between a mixture of elements and a mixture of compounds