A student determines that an aqueous solution that contains 0.262 M potassium cyanide and 0.218 M hydrocyanic acid, also has an H3O+ concentration of 4.06×10-10 M. Based on these data, calculate the value of the equilibrium constant K for the equilibrium: HCN(aq) + H2O H3O+(aq) + CN-(aq)

Calculate K as is usually done, omitting the solvent, water, from the expression for K: K

Darla claims that the first periodic table developed by mendeleev was not completely accurate, so it is not useful at all. harmony argues that it establish the periodic table we use today, making it more credible. who is correct and why? darla is correct, because a model that has any mistakes should be thrown out. darla is correct, because a good model would not need to change. harmony is correct, because mendeleev’s model had all of the information correct in the first version. harmony is correct, because mendeleev’s model made predictions that came true.

Asa choose the correct set of reaction coefficients to properly balance the following chemical equation according to the law of conservation of mass: __s8 + __o2 ==> __so2 1, 1, 8 1, 8, 1 1, 8, 8 8, 1, 1

Can someone me with questions 12 and 13 plz.