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ARC-Challenge / MCAS_2001_8_4 / Suppose 20 g of liquid hydrogen peroxide is heated so it completely breaks down…

Problem

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question

Suppose 20 g of liquid hydrogen peroxide is heated so it completely breaks down into liquid water and oxygen gas. Which best describes the total mass of the water and oxygen that was produced?

choices

more than 20 g because of the addition of heat
more than 20 g because there are now two substances
less than 20 g because oxygen gas is very light
20 g because no matter is added or removed

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Source and history

upstream_id / Original problem ID: MCAS_2001_8_4
task_id: 5414e81a-9188-5d1d-8b86-ecf17cd85076
task_key: ARC~2dChallenge--test--MCAS~5f2001~5f8~5f4
task_revision_id: 2
config / split: ARC-Challenge / test

Official source

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