Can Someone answer these 2 questions? Phosphoric acid, H3PO4, reacts with sodium hydroxide according to the equation below. If 1.75 mol of H3PO4 are reacted with 5.00 mol NaOH, identify the limiting reactant. H3PO4+3 NaOH→Na3PO4+3H2O

Phosphorus trifluoride is formed from its elements, P4+6 F24 PF3. How many grams of fluorine are needed to react with 6.20 g of P?

Two changes are described below. a green banana turns yellow and ripens. a layer of rust forms on an iron nail. which statement is true about the two changes? a) both are chemical changes because new substances are formed. b) both are physical changes because only the physical state of the substances change. c) a is a physical change due to a change of state, but b is a chemical change because new molecules are formed. d) a is a chemical change due to a change of state, but b is a physical change because new molecules are formed.