How many moles of O₂ will be required to produce 1.8x10^24 molecules of water?

Rutherford's experiment indicated that matter was not as uniform as it appears what part of his experimental results implied this idea

Which element has the lowest electronegativity? calcium(ca) gallium(ga) selenium(se) bromine(br)

Consider the following reaction at equilibrium: c(s)+h2o(g)⇌co(g)+h2(g) predict whether the reaction will shift left, shift right, or remain unchanged upon each of the following disturbances. a) c is added to the reaction mixture. b) h2ois condensed and removed from the reaction mixture c) co is added to the reaction mixture d) h2 is removed from the reaction mixture.