How many moles are in 11.2 L of helium gas?

What is the formula that this ionic compounds could form sr2+p3-o2-

According to the tide table below what time of day will the highest tide occur? (2 pt) the highest tide will occur at

Which statement about hf is true? it is zero for any compound in its standard state. it is positive when the bonds of the product store more energy than those of the reactants. it is negative when a compound forms from elements in their standard states. it is zero for any element that is in the liquid state.