One clue we can observe that means a chemical reaction has occurred is the formation of light. What is one chemical reaction you can think of that causes light?

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

May someone me with these science questions

In the space, show a correct numerical setup for calculating the number of moles of co2 present in 11 grams of co2