reaction represented by the equation to any +2 H2O to two and a OH plus H2 how many grams of sodium hydroxide to produce 3.0 mole of sodium with an excess of water

Achemical reaction is done in the setup shown, resulting in a change of mass. what will happen if the same reaction is done in a sealed container that is placed on the electronic balance?

Which conclusion fits the data in the table? a. heat chemically changes chocolate and margarine. b. all solids become liquid at 100°f. c. removing heat from a substance it to melt. d. matter may change shape when it is heated.

Stoichiometry- i need with 14 and 15! an explanation would be appreciated!