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How do you calculate the number of moles of CO2 molecules if the mass is 22g
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Does reactivity increase or decrease as you go down group 7?
An atom of iron is represented as 26Fe 56 Give the number of protons, neutrons and electrons in this atom of iron.
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What is the empirical formula of a compound with the following composition by mass, 48.0g C, 4.0g H and 48.0g O?
When do halogens displace each other in solutions of their salts?
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