Solid iron(iii) hydroxide decomposes to produce iron(iii) oxide and water vapor, according to the following reaction: 2fe(oh)3 → fe2o3 3h2o. if 0.75 l of water vapor is produced at stp,
a. how many grams of iron(iii) hydroxide were used?

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I'm learning about the periodic tables and what each subject's configuration is. for example, hydrogen is 1s^1, but i don't understand how you get that. can someone me understand how to figure out how to figure this out? sorry if the question makes no sense, but it would really a lot if you could me understand! you so much if you can!