What are rarefactions and compressions of sound waves?

Calculate the mass of carbon in 97.0 g of sucrose c12h22o11

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

Anitrogen atom and an oxygen atom combine chemically to form nitric oxide. what is nitric oxide?