In an oxygen molecule, the two oxygen atoms are held together by a double bond with a bond energy of 495 kj/mol. using the balanced chemical equation (shown above), how much energy must be expended in breaking the o=o bonds?

How can you use chemical equations to predict the products of the reaction you can carry out?

What happens when light is scattered?

The following reaction shows sodium carbonate reacting with calcium hydroxide. na2co3 + ca(oh)2 → naoh + caco3 how many grams of naoh are produced from 20.0 grams of na2co3? (molar mass of na = 22.989 g/mol, c = 12.01 g/mol, o = 15.999 g/mol, ca = 40.078 g/mol, h = 1.008 g/mol) 12.2 grams 15.1 grams 24.4 grams 30.2 grams