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please help with 3 wuestions test soon Determine the empirical formula of a compound with the following percent composition: Se: 19.81 % and Br:80.19%. What

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Determine the empirical formula of a compound with the following percent composition: Se: 19.81 % and Br:80.19%. What is the name of NO21 ? What would be the name of a straight chain alkene with three carbons

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