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nh is a chemical formula for, nh compound name formula, what is nh in chemistry, what does nh stand for in chemistry, nh meaning in chemistry, nh full form in chemistry, what is the chemical formula for nh3, what chemical is nh, nh +4 chemical name, nh3 chemical name and formula, the formula nh3 stands for the compound, nh acid or base formula, nh compound name chemistry, nh4 chemical name and formula, nh2 full form in chemistry, nh compound name meaning, nh3 full form in chemistry, nh2 chemical name in chemistry