If you decomposed 100.0g of caffine it will contain 49.47 of carbon. 5.191g of hydrogen 28.86g. Of nitrogen and 16.48g og oxygen.

Answerstudying coal cumbustion as an energy source;

B.1 - hydrogren-1 can only mean there is 1 neutron. it's obvious there is 1 proton or else it wouldn't be hydrogen, so they wouldn't put a number after it unless they were indicating the number of neutrons

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