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A level Chemistry problem on quatities and moles

Thread starter bullit21
Start date Aug 22, 2023

Aug 22, 2023

bullit21

Hello, please could someone show me the working of this - the answer is B but I am not sure how to achieve this answer!
I know that metal oxide, Nitrogen Dioxide and Oxygen are formed but just need advice on the working please on how we obtain calcium.
Thank you so much!

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