Find the numbers of moles, molecules, and atoms that an 18.0g sample of H2O contains

Which element would mostly likely have an electron affinity measuring closest to zero

What volume would 2.25 moles of ne has occupy at stp?

For the reaction c6h14(g) & longrightarrow; c6h6(g) + 4h2(g), δp(h2)/δt was found to be 2.5 x 10-2 atm/s, where δp(h2) is the change in pressure of hydrogen. determine δp(c6h14)/δt for this reaction at the same time.