How do you Convert 42 grams AlOH3 to moles AlOH3?

That is aluminum hydroxide and as a polyatomic ion hydroxide needs to be in parenthesis Thus Al(OH)3 This shows aluminum's 3+ oxidation state and the three matching hydroxides 1- state 42 grams Al(OH)3 ( 1 mole Al(OH)3/78.004 grams) 0.538 moles Al(OH)3 As significant figures require 0.54 moles Al(OH)3.

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