The oxidation number of P in PO-3

If 90.0 grams of ethane reacted with excess chlorine,how many grams of dicarbon hexachloride would form

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.

What prefix multiplier is appropriate for reporting a measurement of 5.57 ×10−5 m?