Which property of matter is conserved in chemical reactions and shown by balanced equations?

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

How many grams of phosphorus are contained in 5.09 moles of phosphorus?

Write and balance the chemical equation that represents the reaction of aqueous sulfuric acid with aqueous sodium hydroxide to form water and sodium sulfate. include phases.