How many moles of hydrogen are in 5.2 moles of c7h18

Consider the four elements above. which one of these elements will combine with oxygen in a 1: 1 ratio?

Which electron configuration represents the electrons in an atom of sodium in the ground state at stp

Which theory was contradicted by experiments with the photoelectric effect? light spreads out after it passes through a small opening. as soon as light strikes metal, electrons will be ejected. visible light, regardless of color, will cause the ejection of electrons when striking metal. the kinetic energy of ejected electrons depends on the frequency of light that strikes the metal.