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What is the relation between concentration of reactants and the rate of chemical reaction?

Which formula can be used to calculate the molar mass of ammonia (nh3)? molar mass of n + molar mass of h 3 × molar mass of n + molar mass of h molar mass of n + 3 × molar mass of h 3 × molar mass of n + 3 × molar mass of h

The name of the ion, s2-, is: sulfurous ion sulfide ion sulfur ion sulfate ion